Diagnostic Trouble Code (DTC) P0506 or P0507
DTC Descriptor
DTC P0506 : Idle Speed Low
DTC P0507 : Idle Speed High
Diagnostic Fault Information
Perform the Diagnostic System Check prior to using this diagnostic procedure.
Circuit/System Description
The throttle actuator control (TAC) motor is a DC motor that is part of the throttle body assembly. The TAC motor drives the throttle valve. The engine control module (ECM) controls the TAC motor based on throttle position sensor input. The idle speed is controlled by the ECM based on various inputs. The ECM commands the TAC motor to open or close the throttle valve in order to maintain the desired idle speed. If the ECM detects the actual idle speed and the desired idle speed are not within a predetermined amount, this DTC sets.
Conditions for Running the DTC
- Before the ECM can report DTC P0506 or P0507 failed, transmission DTCs P0722 and P0723 must run and pass.
- DTCs P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0221, P0222, P0223, P0442, P0443, P0446, P0455, P0458, P0459, P0496, P0722, and P0723 are not set.
- The volumetric efficiency is less than 35 percent, DTC P0506 only.
- The vehicle speed is 0 km/h (0 mph).
- The evaporative emission (EVAP) canister purge valve is OFF.
- The intake air temperature (IAT) is more than -10.5°C (+13°F).
- The engine coolant temperature (ECT) is greater than -10.5°C (+13°F).
- A vehicle speed was detected prior to the diagnostic running.
- DTC P0506 and P0507 run continuously once the above conditions are met for more than 10 seconds.
Conditions for Setting the DTC
P0506
The actual engine speed is less than the desired idle speed by at least 100 RPM for 4 seconds.
P0507
- The actual engine speed is more than the desired idle speed by at least 200 RPM for 4 seconds.
OR- The ECM detects 3 fuel cut-offs due to an engine over speed condition while the engine is idling.
Action Taken When the DTC Sets
DTCs P0506, P0507, and P050A are Type E DTCs.
Conditions for Clearing the DTC
DTCs P0506, P0507, and P050A are Type E DTCs.
Diagnostic Aids
Inspect for a condition in which the throttle valve may have been held open. For example, ice may have formed in the throttle bore.
Circuit/System Verification
- Observe the DTC information with a scan tool.
- If there are any throttle actuator control (TAC), throttle position (TP) sensor, or accelerator pedal position (APP) sensor DTCs set, refer to the appropriate DTC information.
- Operate the engine within the conditions for running the DTCs for 1 minute. DTC P0506 or P0507 should not set.
Circuit/System Testing
Engine operating, command the engine speed up to 1,400 RPM, down to 600 RPM, up to 1,400 RPM, and then exit using the scan tool. The engine speed should steadily increase and decrease as commanded.
- If the idle does not increase or decrease steadily, verify that one of the following conditions is not present :
- Vacuum leaks
- The throttle valve for the correct operation - A throttle valve that does not close correctly sets this DTC.
- Restricted air intake system
- The throttle body for damage and/or tampering
- Incorrect or malfunctioning PCV valve
- Excess deposits in the throttle body
- A parasitic load on the engine - For example, a transmission condition, a belt driven accessory condition
- Repair the condition as necessary.
Diagnostic Trouble Code (DTC) P0513, P0633, P1629, P1632, or P1648
DTC Descriptor
DTC P0513 : Theft Deterrent Key Incorrect
DTC P0633 : Theft Deterrent Key Not Programmed
DTC P1629 : Theft Deterrent Fuel Enable Signal Not Received
DTC P1632 : Theft Deterrent Fuel Disable Signal Received
DTC P1648 : Theft Deterrent Security Code Incorrect
Diagnostic Fault Information
Perform the Diagnostic System Check prior to using this diagnostic procedure.
Circuit/System Description
The engine control module (ECM) and the body control module (BCM) are integral part of the vehicle theft deterrent system. The theft deterrent system authenticates the security code programmed into each of these modules to prevent unauthorised vehicle operation. This authentication process includes the following steps:
- When the ignition is turned ON or the door is unlocked by remote key the BCM and the key exchange security data to verify the correct key is used.
- Once the correct key has been confirmed and the ignition is turned ON, the BCM and ECM exchange data to allow the vehicle to start.
- The data exchange processes conducted use various encrypted data exchanges between each of the devices.
An immobiliser signal DTC sets if the theft deterrent system authentication process fails.
Conditions for Running the DTC
Ignition is in the ACC or ON position.
Conditions for Setting the DTC
- If the key is not programmed to the BCM then the key authentication will fail and the vehicle will be immobilised.
- If the BCM is not linked to the ECM then ECM to BCM authentication will fail and the vehicle will be immobilised.
- If the BCM, key or ECM have corrupt memory, then the authentication will fail and the vehicle will be immobilised.
- If there is a fault with the GMLAN, no authentication will occur and the vehicle will be immobilised.
Action Taken When the DTC Sets
DTCs P0513, P0633, P1629, P1632 or P1648 are type E DTCs.
Conditions for Clearing the DTC
DTCs P0513, P0633, P1629, P1632 or P1648 are type E DTCs.
Diagnostic Aids
Since a fault condition in a wiring connector may trigger DTCs, always test the connectors related to this diagnostic procedure for shorted terminals or poor wiring connections before replacing any component.
The vehicle will allow engine cranking for up to 5 seconds. If the ignition key and BCM do not authenticate the ECM will cease engine cranking or if the engine has started it will stall. Subsequent engine cranking will not initiate unless the ignition is switched OFF for more than 5 seconds.
The "key" referenced in the DTC descriptor does not refer to the vehicle key. In this case "key" is referring to the challenge response.
Circuit/System Testing
Important : Because of normal system communications between the VTD and ECM any theft deterrent B-codes must be diagnosed prior to the diagnosis of P-codes.
The ECM should successfully complete the password learn and the vehicle should start.
If the ECM does not complete the learn or vehicle starting remains disabled, replace the ECM.
Diagnostic Trouble Code (DTC) P0521
DTC Descriptor
DTC P0521 :Engine Oil Pressure (EOP) Sensor Circuit performance.
Diagnostic Fault Information
Perform the Diagnostic System Check prior to using this diagnostic procedure.
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
Engine Oil Pressure 5–Volts Reference Circuit | P0522 | P0522 | P0523 | P0521 |
Engine Oil Pressure Sensor Signal Circuit | P0522 | P0523 | P0523 | P0521 |
Low Reference | - | P0523 | - | P0521 |
Circuit/System Description
The engine oil pressure (EOP) sensor changes voltage based on the engine oil pressure. The EOP sensor is a 3-wire sensor comprising of the signal circuit, the low reference circuit and the 5-volt reference circuit. The engine control module (ECM) supplies 5-volts to the EOP sensor via the 5-volt reference circuit and provides ground via the EOP low reference circuit. The ECM monitors the signal circuit of the EOP sensor to determine the engine oil pressure sensor voltage is within the normal operating range of approximately 1–4 volts. When the engine oil pressure is high, the EOP sensor voltage is high and the ECM senses a high signal voltage. When the engine oil pressure is low, the EOP sensor voltage is low and the ECM senses a low signal voltage. The ECM sends the EOP information to the instrument panel cluster (IPC) via GMLAN serial data message.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
- The ECM detects that the EOP sensor signal circuit is less not with predetermined parameters.
- The above condition is present for greater than 10 seconds.
Action Taken When the DTC Sets
DTC P0521 is a type C Store only DTC.
Conditions for Clearing the MIL/DTC
DTC P0521 is a type C Store only DTC.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the engine oil pressure (EOP) sensor.
- Ignition ON, test for 4.8–5.2 volts between the 5-volt reference circuit and ground.
- If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the ECM.
- If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Verify the scan tool Engine Oil Pressure Sensor parameter is greater than 550 kPa (80 psi).
- If less than 550 kPa, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
- If all circuits test normal, test or replace the EOP sensor.
Diagnostic Trouble Code (DTC) P0522
DTC Descriptor
DTC P0522 : Engine Oil Pressure (EOP) Sensor Circuit Low Voltage.
Diagnostic Fault Information
Perform the Diagnostic System Check prior to using this diagnostic procedure.
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
Engine Oil Pressure 5–Volts Reference Circuit | P0522 | P0522 | P0523 | P0521 |
Engine Oil Pressure Sensor Signal Circuit | P0522 | P0523 | P0523 | P0521 |
Low Reference | - | P0523 | - | P0521 |
Circuit/System Description
The engine oil pressure (EOP) sensor changes voltage based on the engine oil pressure. The EOP sensor is a 3-wire sensor comprising of the signal circuit, the low reference circuit and the 5-volt reference circuit. The engine control module (ECM) supplies 5-volts to the EOP sensor via the 5-volt reference circuit and provides ground via the EOP low reference circuit. The ECM monitors the signal circuit of the EOP sensor to determine the engine oil pressure sensor voltage is within the normal operating range of approximately 1–4 volts. When the engine oil pressure is high, the EOP sensor voltage is high and the ECM senses a high signal voltage. When the engine oil pressure is low, the EOP sensor voltage is low and the ECM senses a low signal voltage. The ECM sends the EOP information to the instrument panel cluster (IPC) via GMLAN serial data message.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
- The ECM detects that the EOP sensor signal circuit is less than 0.1 volt.
- The above condition is present for greater than 10 seconds.
Action Taken When the DTC Sets
DTC P0522 is a type C Store only DTC.
Conditions for Clearing the MIL/DTC
DTC P0522 is a type C Store only DTC.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the engine oil pressure (EOP) sensor.
- Ignition ON, test for 4.8–5.2 volts between the 5-volt reference circuit and ground.
- If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the ECM.
- If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Verify the scan tool Engine Oil Pressure Sensor parameter is greater than 550 kPa (80 psi).
- If less than 550 kPa, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
- If all circuits test normal, test or replace the EOP sensor.
Diagnostic Trouble Code (DTC) P0523
DTC Descriptor
DTC P0523 :Engine Oil Pressure (EOP) Sensor Circuit High Voltage.
Diagnostic Fault Information
Perform the Diagnostic System Check prior to using this diagnostic procedure.
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
Engine Oil Pressure 5–Volts Reference Circuit | P0522 | P0522 | P0523 | P0521 |
Engine Oil Pressure Sensor Signal Circuit | P0522 | P0523 | P0523 | P0521 |
Low Reference | - | P0523 | - | P0521 |
Circuit/System Description
The engine oil pressure (EOP) sensor changes voltage based on the engine oil pressure. The EOP sensor is a 3-wire sensor comprising of the signal circuit, the low reference circuit and the 5-volt reference circuit. The engine control module (ECM) supplies 5-volts to the EOP sensor via the 5-volt reference circuit and provides ground via the EOP low reference circuit. The ECM monitors the signal circuit of the EOP sensor to determine the engine oil pressure sensor voltage is within the normal operating range of approximately 1–4 volts. When the engine oil pressure is high, the EOP sensor voltage is high and the ECM senses a high signal voltage. When the engine oil pressure is low, the EOP sensor voltage is low and the ECM senses a low signal voltage. The ECM sends the EOP information to the instrument panel cluster (IPC) via GMLAN serial data message.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
- The ECM detects that the EOP sensor signal circuit is greater than 4.4 volts.
- The above condition is present for greater than 10 seconds.
Action Taken When the DTC Sets
DTC P0523 is a type C Store Only DTC.
Conditions for Clearing the MIL/DTC
DTC P0523 is a type C Store Only DTC.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the engine oil pressure (EOP) sensor.
- Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit and a known ground.
- If greater than 1 ohm, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
- Ignition ON, test for 4.8–5.2 volts between the 5-volt reference circuit and a known ground.
- If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the ECM.
- If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Install a 3A fusible Link wire between the signal circuit and the low reference circuit. Verify the scan tool Engine Oil Pressure Sensor parameter is less than 8 kPa (1.2 psi).
- If greater than 8 kPa, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
- If all circuits test normal, test or replace the EOP sensor.
Diagnostic Trouble Code (DTC) P0532 or P0533
DTC Descriptor
DTC P0532 : Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit Low Voltage
DTC P0533 : Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit High Voltage
Diagnostic Fault Information
Perform the Diagnostic System Check prior to using this diagnostic procedure.
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
A/C Refrigerant Pressure Sensor Signal Circuit | P0532 | P0532 | P0533 | - |
5- Volt Reference Circuit | P0532 | P0532 | - | - |
Low Reference Circuit | - | P0533 | - | - |
Circuit/System Description
The engine control module (ECM) monitors the high side refrigerant pressure through the A/C refrigerant pressure sensor. The ECM supplies a 5-volt reference and a low reference to the sensor. Changes in the A/C refrigerant pressure cause the sensor signal to the ECM to vary. When the pressure is high, the signal voltage is high. When the pressure is low, the signal voltage is low. When pressure is high, the ECM commands the cooling fans on. When pressure is too high or too low, the ECM will not allow the A/C compressor clutch to engage.
Conditions for Running the DTC
- Engine is running.
- Any of the conditions for setting the DTC are met for 15 seconds.
- Battery voltage is between 11-18 volts.
Conditions for Setting the DTC
- The ECM detects that the A/C pressure is less than 1 psi (0.01 volt).
- The ECM detects that the A/C pressure is more than 428 psi (4.92 volts).
Action Taken When the DTC Sets
DTCs P0532 or P0533 are type E DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0532 or P0533 are type E DTCs.
Diagnostic Aids
A malfunction within the refrigerant system causing high pressure can cause this DTC to set.
Circuit/System Verification
Ignition ON, observe the scan tool A/C High Side Pressure Sensor parameter. The reading should be between 1 psi and 428 psi.
Circuit/System Testing
- Ignition OFF, disconnect the A/C pressure sensor harness connector.
- Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal and ground.
- If greater than 1 ohm, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal and ground.
- If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
- If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Verify the scan tool A/C High Side Pressure Sensor parameter is less than 428 psi.
- If greater than 428 psi, test the signal circuit terminal for a short to voltage. If the circuit tests normal, replace the ECM.
- Install a 3-A fusible link wire between the signal circuit terminal 3 and the 5-volt reference circuit terminal 2. Verify the scan tool A/C High Side Pressure Sensor parameter is greater than 428 psi.
Diagnostic Trouble Code (DTC) P0560
DTC Descriptor
DTC P0560 : System Voltage Performance
Diagnostic Fault Information
Perform the Diagnostic System Check prior to using this diagnostic procedure.
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
Ignition 1 Signal | P0562 | P0562 | - | - |
Circuit/System Description
The engine control module (ECM) monitors the system voltage to ensure that the voltage stays within the correct range. Damage to components and incorrect data may occur when the voltage is out of range.
Conditions for Running the DTC
- The vehicle speed is above 8 km/h (5 mph).
- The system voltage is between 9.5-18 volts.
Conditions for Setting the DTC
The ECM detects a system voltage below 10 volts for 5 seconds.
Action Taken When the DTC Sets
DTC P0560 is a type C Store Only DTC.
Conditions for Clearing the MIL/DTC
DTC P0560 is a type C Store Only DTC.
Circuit/System Verification
With the scan tool installed, ignition ON and the engine OFF, observe the Ignition voltage signal parameter in the ECM data list. The Ignition voltage signal parameter should read 10.5 volts or greater.
Circuit/System Testing
- Measure the battery voltage and compare it with the Ignition voltage signal parameter in the ECM data list. Verify that battery and Ignition voltage signal readings do not differ more than 1 volt.
- If greater than 1 volt test the Ignition circuit of the ECM for short to ground or an open/high resistance. If the circuit tests normal replace the ECM.
Diagnostic Trouble Code (DTC) P0562
DTC Descriptor
DTC P0562 : System Voltage Low
Diagnostic Fault Information
Perform the Diagnostic System Check prior to using this diagnostic procedure.
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
Ignition 1 Signal | P0562 | P0562 | - | - |
Circuit/System Description
The engine control module (ECM) monitors the system voltage to ensure that the voltage stays within the correct range. Damage to components and incorrect data may occur when the voltage is out of range.
Conditions for Running the DTC
- The vehicle speed is above 8 km/h (5 mph).
- The system voltage is between 9.5-18 volts.
Conditions for Setting the DTC
The ECM detects a system voltage below 10 volts for 5 seconds.
Action Taken When the DTC Sets
DTC P0562 is a type C Store Only DTC.
Conditions for Clearing the MIL/DTC
DTC P0562 is a type C Store Only DTC.
Circuit/System Verification
With the scan tool installed, ignition ON and the engine OFF, observe the Ignition voltage signal parameter in the ECM data list. The Ignition voltage signal parameter should read 10.5 volts or greater.
Circuit/System Testing
- Measure the battery voltage and compare it with the Ignition voltage signal parameter in the ECM data list. Verify that battery and Ignition voltage signal readings do not differ more than 1 volt.
- If greater than 1 volt test the Ignition circuit of the ECM for short to ground or an open/high resistance, if the circuit tests normal replace the ECM.
Diagnostic Trouble Code (DTC) P0563
DTC Descriptor
DTC P0563 : System Voltage High
Diagnostic Fault Information
Perform the Diagnostic System Check prior to using this diagnostic procedure.
Circuit/System Description
The engine control module (ECM) monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components and incorrect data may occur when the voltage is out of range.
Conditions for Running the DTC
- The vehicle speed is above 8 km/h (5 mph).
- The system voltage is between 9.5-18 volts.
Conditions for Setting the DTC
The ECM detects a system voltage above 16 volts for more than 1 second.
Action Taken When the DTC Sets
DTC P0563 is a type C Store Only DTC.
Conditions for Clearing the MIL/DTC
DTC P0563 is a type C Store Only DTC.
Diagnostic Aids
- A possible cause of this DTC could be overcharging with a battery charger or jump starting.
Circuit/System Verification
With the scan tool installed, ignition ON and the engine OFF, observe the Ignition voltage signal parameter in the ECM data list. The Ignition voltage signal parameter should read less than 16 volts.
Circuit/System Testing
- Measure the battery voltage and compare it with the Ignition circuit signal parameter in the ECM data list. Verify that battery and Ignition voltage signal readings do not differ more than 1 volt.
- If greater than 1 volt test the Ignition circuit of the ECM for short to voltage or an open/high resistance, if the circuit tests normal replace the ECM.
Diagnostic Trouble Code (DTC) P0571
DTC Descriptor
DTC P0571 : Brake Switch Circuit 1
Diagnostic Fault Information
Perform the Diagnostic System Check prior to using this diagnostic procedure.
Circuit/System Description
The electronic brake control module (EBCM) receives a signal from the brake pedal position (BPP) sensor through the BPP sensor signal circuit. The EBCM then applies a signal through the torque converter clutch (TCC)/brake/cruise control release switch signal circuit to the transmission control module (TCM) and engine control module (ECM).
Conditions for Running the DTC
- The vehicle has cycled from 0-60 km/h (0-37 mph) 3 times in 1 ignition cycle.
- Continuous once the previous criteria have been met.
Conditions for Setting the DTC
- The TCM detects voltage on the TCC/brake/cruise control release switch signal circuit when the circuit should be open.
Action Taken When the DTC Sets
DTC P0571 is a type C Store Only DTC.
Conditions for Clearing the MIL/DTC
DTC P0571 is a type C Store Only DTC.
Circuit/System Testing
- Ignition OFF, connect a scan tool.
- Ensure no other no other DTCs are set.
- Ignition ON, using the scan tool, observe the torque converter clutch (TCC) Brake Switch parameter in the Powertrain TCC Data Display.
- The TCC Brake Switch parameter should display OPEN. If the Display indicates a CLOSED state. Test the TCC/brake/cruise control release switch signal circuit for a short to voltage.
- If all circuits test normal, replace the BCM.
- Ignition ON, Observing the scan tool, depress the brake pedal.
- The TCC Brake Switch parameter should display CLOSED. If Display indicates a OPEN state. Test the TCC/brake/cruise control circuit to the ECM for a short to ground or an open/high resistance.
- If all circuits test normal, replace the ECM.
- If all circuits test normal, replace the BPP sensor.
Diagnostic Trouble Code (DTC) P0601, P0602, P0604, or P0606
DTC Descriptor
DTC P0601 : Control Module Read Only Memory (ROM)
DTC P0602 : Control Module Not Programmed
DTC P0604 : Control Module Random Access Memory (RAM)
DTC P0606 : Control Module Internal Performance
Diagnostic Fault Information
Perform the Diagnostic System Check prior to using this diagnostic procedure.
Circuit/System Description
This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM). This diagnostic also addresses if the ECM is not programmed.
Conditions for Running the DTC
DTC P0601
The checksum calculation at power down in the last drive cycle completely finished. DTC P0601 runs once an ignition cycle.
DTC P0602
The ignition is ON, with the engine OFF. DTC P0602 runs continuously.
DTC P0604
The read/write test at power down in the last drive cycle completely finished. DTC P0604 runs once an ignition cycle.
DTC P0606
DTC P0606 runs continuously with ignition ON or engine operating.
Conditions for Setting the DTC
DTC P0601 : The ECM detects the incorrect read only memory (ROM) checksum for more than 30 seconds.
DTC P0602 :The ECM detects that programming is incomplete for more than 1 second.
DTC P0604 :The ECM detects random access memory (RAM) errors for more than 5 seconds.
DTC P0606 : The ECM detects an internal condition for more than 5 seconds.
Action Taken When the DTC Sets
DTCs P0601, P0602, P0604, and P0606 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P0601, P0602, P0604, and P0606 are Type A DTCs.
Circuit/System Verification
Ignition ON, observe the DTC information with a scan tool. DTC P0601, P0602, P0604, and P0606 should not set.
- If DTC P0601 or P0604 failed this ignition, replace the ECM.
Circuit/System Testing
P0602
Program the ECM. If DTC P0602 sets after programming, perform the following steps :
- Ensure that all tool connections are secure.
- Ensure the programming equipment is operating correctly.
- Ensure the correct software and the correct calibration is used.
- Attempt to program the ECM.
- If DTC P0602 sets, replace the ECM.
P0606
- Observe the Freeze Frame/Failure Records with a scan tool.
- Clear the DTCs with a scan tool.
- Ignition OFF for 30 seconds.
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
- If DTC P0606 failed this ignition, replace the ECM.
Diagnostic Trouble Code (DTC) P0615, P0616, or P0617
DTC Descriptor
DTC P0615 : Starter Relay Control Circuit
DTC P0616 : Starter Relay Control Circuit Low Voltage
DTC P0617 : Starter Relay Control Circuit High Voltage
Diagnostic Fault Information
Perform the Diagnostic System Check prior to using this diagnostic procedure.
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
Module Circuit | Low Code | Low Code | High Code | - |
Coil Side Supply Voltage Circuit | Low Code | Low Code | - | - |
Circuit/System Description
The engine control module (ECM) supplies a ground path for the starter relay when start enable has been requested. The ECM monitors this circuit for conditions that are incorrect for the commanded state. If the ECM detects an improper circuit condition, starter relay DTC P0615, P0616 or P0617 will set.
Conditions for Running the DTC
System voltage is between 9 and 16 volts.
Conditions for Setting the DTC
- The ECM detects an improper voltage level on the control or output circuit that controls the starter relay.
Action Taken When the DTC Sets
DTCs P0615, P0616 or P0617 are type E DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0615, P0616 or P0617 are type E DTCs.
Diagnostic Aids
- Ignition system DTCs set with the ignition switch in the START position if the starter relay or the starter is inoperative. When the ECM enables starter operation. If a condition exists which prevents the engine from cranking, the ECM will not receive signal input from the CKP and CMP sensors and the DTCs will set.
- Reviewing the Failure Records since the diagnostic test last failed may assist in diagnosing the condition. The information may help determine how often the condition that set the DTC occurs.
Circuit/System Verification
- Ignition ON, command the Starter relay ON and OFF with a scan tool. Feel or listen to verify that each relay turns ON and OFF with each command.
Circuit/System Testing
- Ignition OFF, disconnect the Starter relay.
- Ignition ON, verify that a test lamp does not illuminate between the earth terminal and a known ground.
- If the test lamp illuminates, test the control circuit for a short to voltage.
- Ignition ON, Connect a test lamp between the control circuit terminal and a known ground. Command the relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If the test lamp is always ON, test the relay control circuit for a short to voltage. If the circuit tests normal replace the ECM.
- If the test lamp is always OFF, test the relay control circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the ECM.
- Connect a test lamp between the Battery+ terminal and a known ground.
- If the test lamp does not activate, test the Battery+ for a short to ground or an open/high resistance.
- Disconnect the starter motor solenoid wire at the starter motor, Connect a test lamp between the starter solenoid wire and a known ground. Connect a 10A fusible link wire between the battery positive post and the starter motor supply circuit terminal and verify test light illuminates.
- If the test lamp does not activate, test the Starter motor solenoid voltage supply circuit for a short to ground or an open/high resistance. If all circuits test normal, replace the relay.
Diagnostic Trouble Code (DTC) P0625, or P0626
DTC Descriptor
DTC P0625 : Generator F Terminal Low Voltage
DTC P0626 : Generator F Terminal high Voltage
Diagnostic Fault Information
Perform the Diagnostic System Check prior to using this diagnostic procedure.
Circuit/System Description
The engine control module (ECM) uses the alternator eld duty cycle signal circuit to monitor the duty cycle of the alternator. The alternator eld duty cycle signal circuit connects to high side of the field windings in the alternator. A pulse width modulated (PWM) high side driver in the voltage regulator turns the eld windings ON and OFF. The ECM uses the PWM signal input to determine the alternator load on the engine. This allows the ECM to adjust the idle speed to compensate for high electrical loads. The ECM monitors the status of the alternator eld duty cycle signal circuit. When the key is in the RUN position and the engine is OFF, the ECM should detect a duty cycle near 0 percent. When the engine is running, the duty cycle should be between 5-95 percent.
Conditions for Running the DTC
- The vehicle speed is above 8 km/h (5 mph).
- The system voltage is between 9.5-18 volts.
Conditions for Setting the DTC
With the engine running, the ECM detects a PWM signal less than 5 percent for at least 15 seconds.
Action Taken When the DTC Sets
DTC's P0625 and P0626 are type C Store Only DTCs
Conditions for Clearing the MIL/DTC
DTC's P0625 and P0626 are type C Store Only DTCs
Circuit/System Verification
With the scan tool installed, ignition ON and the engine running, observe the alternator-F Terminal Signal parameter in the ECM data list. The alternator-F Terminal Signal parameter should read between 5 and 95 percent.
Circuit/System Testing
- Ignition OFF, disconnect the alternator harness connector.
- With the ignition ON, engine OFF, connect a test lamp to battery positive voltage and repeatedly probe the alternator field duty cycle circuit, harness side while monitoring the alternator-F Terminal Signal Parameter in the ECM data list, it should change from 0 percent to above 95 percent.
- If the alternator-F Terminal Signal parameter was not affected by the test lamp, test the alternator-F Terminal Signal circuit for a short to ground or an open/high resistance. If circuit tests normal replace the ECM.
Diagnostic Trouble Code (DTC) P0627, P0628, or P0629
DTC Descriptor
DTC P0627 : Fuel Pump Relay Control Circuit
DTC P0628 : Fuel Pump Relay Control Circuit Low Voltage
DTC P0629 : Fuel Pump Relay Control Circuit High Voltage
Diagnostic Fault Information
Perform the Diagnostic System Check prior to using this diagnostic procedure.
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
Fuel Pump Relay Control | P0628 | P0627 | P0629 | - |
Fuel Pump Ground | - | P0627 | - | - |
Battery Voltage - Relay Switch | 1 | 2 | - | - |
Fuel Pump Supply Voltage | 1 | 2 | 3 | - |
- The fuel pump fuse opens and the engine cranks but does not run.
- The engine cranks but does not run.
- The fuel pump operates continuously and the battery will discharge.
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Circuit/System Description
The engine control module (ECM) provides ignition voltage to the coil side of the fuel pump relay whenever the engine is cranking or running. The control module enables the fuel pump relay as long as the engine is cranking or running, and ignition system reference pulses are received. If no ignition system reference pulses are received, the control module turns OFF the fuel pump. The fuel pump relay control circuit is equipped with a feedback circuit that is pulled up to 2.5 volts within the ECM. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage. If the ECM detects that the control circuit voltage is within an expected range when the circuit is commanded ON or OFF, one of these DTCs sets.
Conditions for Running the DTC
- The ignition is ON, with the engine OFF.
- The ignition 1 voltage is more than 10.5 volts.
- The ECM has commanded the fuel pump relay ON and OFF at least once during the ignition cycle.
- The above conditions are met for more than 1 second.
- The DTCs runs continuously once the above conditions are met.
Conditions for Setting the DTC
DTC P0627 :The ECM detects the fuel pump relay control circuit is open.
DTC P0628 : The ECM detects the fuel pump relay control circuit is shorted to ground.
DTC P0629 : The ECM detects the fuel pump relay control circuit control circuit is shorted to voltage.
Action Taken When the DTC Sets
DTCs P0627, P0628 and P0629 are Type E DTCs.
Conditions for Clearing the DTC
DTCs P0627, P0628 and P0629 are Type E DTCs.
Circuit/System Verification
Ignition ON, command the Fuel Pump Relay ON and OFF with a scan tool. You should hear an audible click.
Circuit/System Testing
- Ignition OFF, disconnect the fuel pump relay.
- Connect a test lamp between the control circuit of the fuel pump relay and the negative terminal of the battery.
- Ignition ON, command the fuel pump ON and OFF with a scan tool. The test lamp should turn ON and OFF as commanded.
- If the test lamp remains OFF all the time, test for a short to ground or an open/high resistance on the control circuit. If circuit/connections test normal, replace the ECM.
- If the test lamp remains ON all the time, test for a short to voltage on the control circuit. If circuit/connections test normal, replace the ECM.
- Ignition OFF, connect a test lamp between the fuel pump relay control circuit and the ground circuit of the fuel pump relay.
- Ignition ON, command the fuel pump ON and OFF with a scan tool. The test lamp should turn ON and OFF as commanded.
- If the test lamp does not turn ON when commanded, repair the open/high resistance in ground circuit of the fuel pump relay.
- If all circuits/connections test normal, test or replace the fuel pump relay.
Component Testing
- Measure for 70–110 ohms of resistance between terminals 85 and 86 of the fuel pump relay.
- If the resistance is not within the specified range, replace the fuel pump relay.
- Measure for infinite resistance between the following terminals of the fuel pump relay :
- 30 and 86
- 30 and 87
- 30 and 85
- 85 and 87
- If continuity is detected, replace the fuel pump relay.
- Connect a 20 amp fused jumper wire from the positive terminal of the battery to relay terminal 85. Connect a jumper wire from the negative terminal of the battery to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay.
- If the resistance measures more than 2 ohms, replace the fuel pump relay.
Diagnostic Trouble Code (DTC) P0638, P2100, P2101, or P2119
DTC Descriptor
DTC P0638 : Throttle Actuator Control (TAC) Command Performance
DTC P2100 : Throttle Actuator Control (TAC) Motor Control Circuit
DTC P2101 : Control Module Throttle Actuator Position Performance
DTC P2119 : Throttle Closed Position Performance
Circuit/System Description
The engine control module (ECM) controls the throttle valve by applying a varying voltage to the control circuits of the throttle actuator control (TAC) motor. The ECM monitors the duty cycle that is required to actuate the throttle valve. The ECM monitors the throttle position (TP) sensors 1 and 2 to determine the actual throttle valve position.
Conditions for Running the DTC
P0638 and P2101
- The ignition is ON or the engine is operating.
- The ignition 1 voltage is more than 7 volts.
- DTCs P0638 and P2102 run continuously once the above conditions are met for more than 1 second.
P2100
- Before the ECM can report DTC P2100 failed, DTC P2101 must run and pass.
- The ignition is ON or the engine is operating.
- DTC P2100 runs continuously once the above conditions are met for more than 1 second.
P2119
- The ignition is ON.
- The vehicle speed is 0 km/h (0 mph).
- The engine speed is less than 40 RPM.
- The engine coolant temperature (ECT) is 5-85°C (41-185°F).
- The intake air temperature (IAT) is 5-60°C (41-140°C).
- The ignition 1 voltage is more than 10 volts.
- The accelerator pedal position (APP) is less than 15 percent.
- DTC P2119 runs once per ignition cycle when the above conditions are met for less than 1 second.
Conditions for Setting the DTC
DTC P0638
- The ECM detects that the commanded duty cycle for the range test high is more than 80 percent for more than 0.6 seconds.
OR- The ECM detects that the commanded duty cycle for the range test low is more than 80 percent for more than 5 seconds.
DTC P2100
- The ECM detects the output driver for the TAC motor does not deactivate when commanded OFF.
- The condition exists for less than 4 seconds.
DTC P2101
- The ECM detects that the difference between the commanded and the actual throttle plate position is more than 10 percent.
- The condition exists for less than 4 seconds.
DTC P2119
The ECM determines that the throttle valve did not return to the rest position within 560 milliseconds.
Action Taken When the DTC Sets
DTCs P0638, P2100, P2101, and P2119 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P0638, P2100, P2101, and P2119 are Type A DTCs.
Diagnostic Aids
Inspect for a condition in which the throttle valve may have been held open. For example, ice may have formed in the throttle bore causing the throttle valve not to close.
Circuit/System Verification
- Ignition ON, using a scan tool observe the DTC information. Verify DTCs P0121, P0122, P0123, P0221, P0222, or P0223 are not set.
- If any of the DTCs are set go to DTC P0121, P0122, P0123, P0221, P0222, or P0223 for further diagnosis.
- Using a scan tool verify that TP sensor 1 voltage is between 0.2–0.9 volts, and TP sensor 2 voltage is between 4.2–4.8 volts.
- If either TP sensor voltage is not within the specified range go to DTC P0121, P0122, P0123, P0221, P0222, or P0223for further diagnosis.
- Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release the pedal. Repeat the procedure several times. DTCs P0638, P2111, P2112, or P2119 should not set.
- If any of the DTCs P0121, P0122, P0123, P0221, P0222, or P0223 set while performing this procedure go to DTC P0121, P0122, P0123, P0221, P0222, or P0223for further diagnosis.
- Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times. DTCs P0638, P2111, P2112, or P2119 should not set.
- If any of the DTCs P0121, P0122, P0123, P0221, P0222, or P0223 set while performing this procedure go to DTC P0121, P0122, P0123, P0221, P0222, or P0223for further diagnosis.
- If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.
Circuit/System Testing
- Inspect the throttle body for the following conditions :
- A throttle blade that is not in the rest position
- A throttle valve that is binding open or closed
- A throttle valve that opens or closes without spring pressure
- If a condition is found, replace the throttle body.
Important : Disconnecting the throttle body harness connector causes additional DTCs to set.
- Ignition OFF, disconnect the harness connector of the throttle body. Ignition ON, measure for 2-4 volts on the motor control 1 and motor control 2 circuits.
- If voltage is less than 2 volts, test the appropriate motor control circuit for an open or a short to ground. If the circuit tests normal, replace the ECM.
- If voltage is more than 4 volts, test the appropriate motor control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Ignition OFF, connect the injector test lamp between the TAC motor control 1 and TAC motor control 2 circuits of the throttle body harness connector. Observe the injector test lamp while turning the ignition ON for 5 seconds and the OFF.Verify the injector test lamp illuminates brightly.
- If the injector test lamp does not illuminate, test for a short between the TAC motor control 1 and TAC motor control 2 circuits. If the circuit tests normal, replace the ECM.
- If all circuits test normal, replace the throttle body.
Diagnostic Trouble Code (DTC) P0645, P0646, or P0647
DTC Descriptor
DTC P0645 : Air Conditioning (A/C) Clutch Relay Control Circuit
DTC P0646 : Air Conditioning (A/C) Clutch Relay Control Circuit Low Voltage
DTC P0647 : Air Conditioning (A/C) Clutch Relay Control Circuit High Voltage
Diagnostic Fault Information
Perform the Diagnostic System Check prior to using this diagnostic procedure.
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
Air Conditioning (A/C) Clutch Relay Control Circuit | P0646 | P0645, P0646 | P0647 |
Air Conditioning (A/C) Clutch Relay Coil Voltage Supply Circuit | P0646 | P0645, P0646 | P0647 |
Circuit/System Description
The engine control module (ECM) grounds the Air Conditioning (A/C) Clutch control circuit through an internal solid state device called a driver. The primary function of the driver is to supply the ground for the component being controlled. Each driver has a fault line that is monitored by the ECM. When the ECM is commanding a component ON the voltage potential of the control circuit should be low near 0 volts. When the ECM is commanding the control circuit to a component OFF the voltage potential of the circuit should be high near battery voltage. If the ECM detects that the actual state of the control circuit does not match the expected state a DTC will set.
Conditions for Running the DTC
- The ignition is ON.
- The system voltage is between 9-18 volts.
Conditions for Setting the DTC
- An improper voltage level has been detected on the air conditioning control circuit.
- The condition must be present for a minimum of 30 seconds.
Action Taken When the DTC Sets
DTCs P0645, P0646, and P0647 are type E DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0645, P0646, and P0647 are type E DTCs.
Circuit/System Verification
Ignition ON, command the clutch ON and OFF with a scan tool. Listen to verify that the clutch engages and disengages ON and OFF with each command.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the A/C compressor.
- Ignition ON, verify that a test light illuminates between the B+ terminal and a known ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal. Replace the ECM
- Ignition ON, Command the A/C compressor On with a scan tool. Verify that a test lamp illuminates between B+ and the control circuit.
- If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal. Replace the ECM
- If all circuits/connections test normal. Replace the A/C compressor clutch.
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