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| Table 1: | Engine Control Module Scan Tool Data |
| Table 2: | Engine Control Module (ECM) Scan Tool Output Controls |
The Engine Control Module Scan Tool Data List contains all engine-related parameters that are available on the scan tool. This is a master list arranged in alphabetical order and not all the parameters listed are in every engine platform.
Use the Engine Scan Tool Data List only after the following is determined:
| • | The Diagnostic System Check - Vehicle is completed. |
| • | No diagnostic trouble codes (DTCs) |
| • | On-board diagnostics are functioning properly. |
The scan tool values from a properly running engine may be used for comparison with the engine you are diagnosing. The Engine Scan Tool Data List represents values that would be seen on a normally running engine.
Note: A scan tool that displays faulty data should not be used. The scan tool concern should be reported to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.
Only the parameters listed below are referenced in this service manual for use in diagnosis.
Parameter | System State | Expected Value | Description |
|---|---|---|---|
Base Operating Conditions: Engine Idling/Radiator Hose Hot/Park or Neutral/Closed Loop | |||
A/C Compressor Clutch Relay Command | A/C ON | Active | This parameter displays the state of the air conditioning (A/C) clutch relay control circuit as commanded by the control module. |
A/C Disabled - A/C Pressure Out of Range | A/C ON | Inactive | This parameter displays whether the A/C pressure is out of range for normal operation as determined by the control module. |
A/C Disabled - Battery Voltage Out of Range | A/C ON | Inactive | This parameter displays whether the battery voltage is out of range for normal A/C operation as determined by the control module. |
A/C Disabled - Engine Coolant Temperature too High | A/C ON | Inactive | This parameter displays whether the engine coolant temperature is out of range for normal A/C operation as determined by the control module. |
A/C Disabled - Vehicle Launch Acceleration | A/C ON | Inactive | This parameter displays whether the vehicle is accelerating and turning the A/C compressor OFF. |
A/C High Side Pressure Sensor | A/C OFF | 0-5 V | This parameter displays the voltage from the A/C high side pressure sensor signal circuit to the control module. |
A/C ON | 0-5 V | ||
A/C High Side Pressure Sensor | A/C OFF | 700-900 kPa (101-130 PSI) | This parameter displays the pressure from the A/C high side pressure sensor signal circuit to the control module. |
A/C ON | 900-1300 kPa (130-174 PSI) | ||
A/C Off for WOT | A/C ON | Inactive | This parameter displays the state of the air conditioning (A/C) clutch relay control circuit as commanded by the control module. |
A/C Switch | A/C ON | Active | This parameter displays the state of the A/C request input to the control module from the heating, ventilation, and air conditioning (HVAC) controls. |
Add-On Heater Relay 1 Command | -- | Inactive | This parameter displays the commanded state of the aux heater relay 1 control circuit. |
Add-On Heater Relay 2 and 3 Command | -- | Inactive | This parameter displays the commanded state of the aux heater relay 2 and 3 control circuit. |
APP Sensor 1 or 2 | - | APP 1-0.95 Volts APP 2-0.47 Volts | This parameter displays the voltage of each APP sensor signal circuit as measured by the control module. |
APP Sensors | -- | 0% | This parameter displays the angle of accelerator pedal position as calculated by the control module using the signals from the APP sensors. |
BARO | -- | 65-104 kPa (8-16 PSI) - Varies with altitude | This parameter displays the barometric pressure. The control module uses the barometric pressure sensor input for fuel control to compensate for altitude differences. |
Boost Pressure Sensor | -- | 82-110 kPa (12-16 PSI) | This parameter displays the turbocharger boost pressure inside the engine as calculated by the control module based on the signal from the Boost pressure sensor. |
Boost Pressure Sensor | -- | 1.45-1.75 V | This parameter displays the voltage of the turbocharger boost pressure inside the engine calculated by the control module based on the signal from the Boost pressure sensor. |
Boost Solenoid Valve Command | -- | % | This parameter displays the % of the solenoid commanded by the control module. |
Brake Pedal Switch | -- | Inactive | This parameter displays the state of the brake pedal as determined by the brake lamp pedal switch. |
Calculated Air Flow | -- | 16-28 kg/h | This parameter displays the calculated air flow into the engine. The calculation is used in several diagnostics to determine when to run the diagnostics. |
Broadcast Code | -- | -- | This parameter displays the controller broadcast code or the last 4 digits of the controller part number. |
Clutch Pedal Switch | -- | Inactive | This parameter displays the current state of the clutch pedal as determined by the control module. The control module monitors the pedal switch on the clutch pedal for vehicles equipped with manual transmission. |
Cooling Fan Relay Control 1, Control 2, or Control 3 Command | Fans Commanded ON | On | This parameter displays the control module commanded state of the fan relay control circuits. |
Cruise Control ON/OFF Switch | Cruise Control ON | Yes | This parameter displays the state of the cruise ON/OFF switch input to the control module. |
Cruise Control Release Switch | Cruise Resume/Accel. Switch ON | On | This parameter displays the state of the cruise Resume/Accel switch input to the control module from the cruise control system. |
Cruise Control Set Switch | Cruise Set/Freewheel Switch ON | On | This parameter displays the state of the cruise Set/Freewheel switch input to the control module from the cruise control system. |
Desired Boost Pressure | -- | 98 kPa (14.21 PSI) | This parameter displays the desired turbocharger boost pressure inside the engine as calculated by the control module based on the signal from the Boost pressure sensor. |
Desired EGR Position | -- | % | This parameter displays the desired EGR position as calculated by the control module. |
Desired Fuel Rail Pressure | -- | 42500.0-44500.0 kPa 6215.0-6265.0 PSI | This parameter displays the desired fuel rail pressure as calculated by the control module. This value is calculated based on engine speed, engine load, and sensor inputs. |
Desired Idle Speed | -- | 700-800 RPM | This parameter displays the desired engine idle speed as commanded by the control module. |
Distance Since Last DPF Regeneration | -- | Varies | This parameter displays the mileage that has elapsed since the last diesel particulate filter regeneration occurred. |
DPF Differential Pressure Sensor | -- | -3 to 15 kPa (-0.43 to 2.17 PSI) | This parameter indicates the pressure at the DPF and is calculated by the control module based on the signal from the sensor. |
DPF Differential Pressure Sensor | -- | 0.40-0.60 Volts | This parameter displays the voltage calculated by the control module, based on the input from the exhaust gas temperature sensors when the particulate filter is full and needs a particulate filter regeneration. |
DPF Soot Accumulation | -- | 0-100% | This parameter displays the amount of calculated soot in exhaust particulate filter. |
ECT Sensor | -- | -39 to +140°C (-38 to +284°F) | This parameter displays the temperature of the engine coolant based on input to the control module from the engine coolant temperature (ECT) sensor. |
ECT Sensor | -- | 0-5 V | This parameter displays the voltage calculated by the control module from the engine coolant temperature (ECT) sensor. |
EGR Command | -- | 40-55% | This parameter displays the percent of the duty cycle commanded by the control module. |
Engine Speed | Engine Cranking | Greater than 60 RPM | This parameter displays the speed of the engine crankshaft rotation from information received from the crankshaft position (CKP) sensor. If there is a CKP sensor DTC, the ECM calculates the engine speed from one of the camshaft position (CMP) sensors. |
Engine Idling | Approximately 750-850 RPM | ||
Exhaust Gas Temperature Sensor 1 or 2 | - | EGT 1-110 -140°C ( 230-284°F) EGT 2-80-120°C (176-248°F) | This parameter displays the temperature of the exhaust gas calculated by the control module based on the input from the exhaust gas temperature sensors. |
Exhaust Gas Temperature Sensor 1 or 2 | - | EGT 1 - 1.00-1.15 V EGT 2-0.90-1.10 V | This parameter displays the voltage calculated by the control module based on the input from the exhaust gas temperature sensors. |
Fuel Heater Command | -- | OFF | This parameter displays the control module commanded state of the fuel heater control circuit. |
Fuel Pump Relay Command | Ignition ON, engine OFF | Fuel pump on for 2 s | This parameter displays the control modules commanded state of the fuel pump relay control circuit. |
Engine idling | On | ||
Fuel Rail Pressure Regulator Command | -- | % | This parameter displays the control modules commanded state of the fuel rail pressure regulator. |
Fuel Rail Pressure Regulator Command | - | mA | This parameter displays the control modules commanded state of the fuel pressure regulator. |
Fuel Rail Pressure Sensor | -- | 42,800-43,800 kPa (6,207-6,352 PSI) | This parameter displays the fuel rail pressure as calculated by the control module using the signal from the fuel rail pressure (FRP) sensor. |
Fuel Rail Pressure Sensor | -- | 1.40-1.50 V | This parameter displays the voltage of the fuel rail pressure calculated by the control module using the signal from the fuel rail pressure (FRP) sensor. |
Fuel Temperature Sensor | -- | 25-40°C (77-104°F) | This parameter displays the fuel temperature calculated by the control module based on input from the fuel temperature sensor. |
Fuel Temperature Sensor | -- | 2.80 V | This parameter displays the voltage calculated by the control module based on input from the fuel temperature sensor. |
Glow Plug Relay Command | -- | Active | This parameter displays the state of the glow plug controller. |
Glow Plug Relay Feedback | -- | Inactive | This parameter displays the control module commanded state of the glow plug. |
IAT Sensor 1 or Sensor 2 | -- | -39 to +140°C (-38 to +284°F) | This parameter displays the temperature of the air entering the engine air duct calculated by the control module based on the input from the intake air temperature sensors. |
MAF Sensor | -- | kg/h | This parameter displays the quantity calculated by the control module based on a signal from the mass air flow (MAF) Sensor. |
Run/Crank Terminal Status | Ignition ON | Active | This parameter displays the voltage measured at the ignition circuit of the control module. Voltage is applied to the control module when the ignition switch is in the ignition 1 position. |
Vehicle Speed | -- | 0 Km/h (0 MPH) | This parameter displays the speed of the vehicle as calculated by the transmission control module (TCM) from information received from the vehicle speed sensor (VSS). |
Wait to Start Indicator | -- | Inactive | This parameter displays the commanded state of the glow plug lamp circuit by the control module. |
Output Control | Description | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
A/C Compressor Clutch Relay | This function activates the A/C compressor relay. The normal commanded state of the A/C relay is OFF. The A/C compressor will turn ON/OFF when commanded ON/OFF. The system remains in the commanded state for approximately 5 seconds. The engine control module (ECM) will inhibit the operation of the A/C relay when the ambient air temperature is low. | ||||||||||||
Calculated Fuel Economy Setup | This function is used to setup the calculated fuel economy. | ||||||||||||
Compression Test | This device control is used to set-up the engine for a compression test. The fuel system is disabled. The throttle is opened to a wide open throttle (WOT) position. The extended crank feature is not active. The scan tool initiates the test when the following conditions are met:
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Cooling Fan Relay 1 | This function controls the low speed cooling fan relay. When commanded ON, the cooling fan will turn ON at low speed for approximately 5 seconds. | ||||||||||||
Cooling Fan Relays 2 | This function controls the high speed cooling fan relay. When commanded ON, the cooling fan will turn ON at medium speed. | ||||||||||||
Cooling Fan Relays 3 | This function controls the high speed cooling fan relay. When commanded ON, the cooling fan will turn ON at high speed. | ||||||||||||
DPF Reset |
Note: This function is only allowed with the ignition ON, engine OFF. This function resets the learned values for the diesel particulate filter in the ECM after the DPF has been replaced. | ||||||||||||
DPF Pressure Sensor Learn |
Note: This function is only allowed with the ignition ON, engine OFF. This function resets the learned values for the diesel particulate filter in the ECM after the DPF pressure sensor has been replaced. | ||||||||||||
DPF Service Regeneration | This function resets the learned values for the diesel particulate filter in the ECM after the DPF has been replaced. | ||||||||||||
EGR Cooler Bypass Valve | This function opens or closes the EGR cooler bypass valve. The device control will not change unless changed or cancelled by the scan tool. | ||||||||||||
EGR Valve | This function opens or closes the exhaust gas recirculation (EGR) solenoid. The EGR solenoid increases or decreases in 10 % increments. The device control will not change unless changed or cancelled by the scan tool. | ||||||||||||
Engine Oil Life Reset | This function turns OFF the change oil lamp and resets the values in the ECM. | ||||||||||||
Engine Speed |
Note: This function is only allowed with the engine idling. This function adjusts the engine speed in 25, 100, or 500 RPM increments between 600-1,500 RPM. The device control will not change unless changed or cancelled by the scan tool. | ||||||||||||
Fuel Heater Relay | This function activates the fuel heater relay ON or OFF. The Device Control will not change unless changed or cancelled by the scan tool. | ||||||||||||
Fuel Injector Learn |
Note: This function is only allowed with the ignition ON, engine OFF. This function resets the learned fuel injector values in the ECM after the ECM has been replaced. | ||||||||||||
Fuel Pump Relay |
Note: This function is only allowed with the ignition ON, engine OFF. This function activates the fuel transfer pump or prime pump (depending on application) ON or OFF. The Device Control will not change unless changed or cancelled by the scan tool. | ||||||||||||
Fuel Rail Pressure Sensor or Fuel Rail Learn | This function allows the fuel rail pressure sensor or fuel rail to be relearned by the ECM. | ||||||||||||
Generator L-Terminal |
Note: This function is only allowed with the engine idling. This function controls the system voltage. When commanded ON, normal system voltage output is present. When commanded OFF, system voltage output is no longer present, Ignition 1 signal continues to drop, Gen L-Terminal goes to OFF and Gen F-Terminal continues to drop. | ||||||||||||
Glow Plugs | This function activates the Glow Plug Controller ON or OFF. The Device Control will be aborted after 12 seconds for the first activation, and after 5 seconds for every other activation. The Device Control is inhibited if the engine is running. | ||||||||||||
Intake Air Flow Valve Position |
Note: This function is only allowed with the ignition ON, engine OFF. This function opens or closes the throttle blade. The throttle blade increases or decreases in 10 % increments. The scan tool initiates the test when the following conditions are met:
The system remains in the commanded state until cancelled by the scan tool. | ||||||||||||
Malfunction Indicator Lamp (MIL) | This function activates the malfunction indicator lamp (MIL). The MIL will remain illuminated until cancelled by the scan tool. | ||||||||||||
Setup new Control Module |
Note: This function is only allowed with the ignition ON, engine OFF. This function resets the following:
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Turbocharger Vane Position |
Note: This function is only allowed with the engine idling. Cycles the turbocharger vane position solenoid to 95 % boost and back to 0 % boost. The device control is limited to engine speeds less than 2,000 RPM. | ||||||||||||
Wait to Start Indicator | This function activates the Wait to Start indicator lamp. The Wait to Start indicator lamp will remain illuminated until cancelled by the scan tool. |
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