Service Manual2007 Captiva Diagnostic Trouble Code (DTC) P0116

Captiva

Diagnostic Trouble Code (DTC) P0116

DTC Descriptor

DTC P0116 :Engine Coolant Temperature (ECT) Sensor 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
ECT Sensor Signal	P0117	P0118, P0119	P0118, P0119¹	P0116¹
Low Reference	-	P0118, P0119	P0118, P0119¹	P0116¹
¹ Internal ECM or ECT sensor damage may occur if the circuit is shorted to B+

Circuit Description

The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module (ECM) supplies 5 volts to the ECT signal circuit and supplies a ground to the low reference circuit. The ECM monitors the mutual performance of the ECT and the intake air temperature (IAT) signals. The ECM monitors the warm up and cool down behavior of the sensors, after a vehicle driven at operating temperature is shut down. If the ECM detects that the ECT is not with in a predetermined range of IAT after a long soak, or the ECT and IAT are not within a range of each other, as compared to a previous cold start, this DTC sets.

The following table illustrates the difference between temperature, resistance, and voltage :

ECT	ECT Resistance	ECT Signal Voltage
Cold	High	High
Warm	Low	Low

Conditions for Running the DTC

Condition 1

Before the ECM can report DTC P0116 failed, DTC P0101 must run and pass.
DTCs P0117, P0118, and P0119, are not set.
The engine run time of the previous ignition cycle was more than 10 minutes.
The accumulated air mass of the previous ignition cycle was more than 4,000 grams.
The minimum IAT during the previous ignition cycle is between -30°C to +2°C (-22°F to 36°F).
The IAT at ignition ON is between -30°C to 2°C (-22°F to +36°F).
DTC P0116 runs once an ignition cycle when the above conditions are met.

Condition 2

Before the ECM can report DTC P0116 failed, DTC P0101 must run and pass.
DTCs P0117, P0118, and P0119 are not set.
The ECT at the previous engine shut down is more than 85°C (185°F).
The ECM detects a predicted rise in the intake air temperature, at ECM power down of the previous ignition cycle. The hood being open or a strong wind may prevent a rise in the IAT from occurring.
The block heater is not detected.
DTC P0116 runs once an ignition cycle when the above conditions are met.

Conditions for Setting the DTC

The ECM determines the difference between the ECT and IAT at ignition ON is not within 10°C (18°F) of the difference recorded during a previous ignition cycle, when the enable conditions were met.

The ECM determines the IAT at ignition ON is within a calibrated range of the ECT and IAT recorded during a previous ignition cycle, but the ECT is not within 30°C (54°F) of the calibrated range.
Either condition exists for more than 4 seconds.

Action Taken When the DTC Sets

DTC P0116 is a Type E DTCs.

Conditions for Clearing the MIL/DTC

DTC P0116 is a Type E DTCs.

Diagnostic Aids

Test the ECT and the IAT sensor at various temperature levels in order to evaluate the possibility of a skewed sensor. A skewed sensor can result in a DTC or a driveability condition. Refer to Temperature vs Resistance - Engine Coolant Temperature (ECT) Sensorand Temperature vs Resistance - Intake Air Temperature (IAT) Sensor.
If the vehicle has sat overnight, the IAT sensor and the ECT sensor values should display within 3°C (5°F).
After starting a cold engine, the ECT sensor temperature should rise steadily, then stabilize after the thermostat opens.
High resistance in the circuits of either the ECT or IAT sensor could set a DTC.
A short to ground or voltage through a conductive material or fluid could set this DTC. Inspect the ECT sensor for evidence of coolant leaking into the connector body.

Circuit/System Verification

Verify that the following DTCs are not set: P0101, P0117, P0118, and P0119.

If any of the DTCs are set, refer to the appropriate DTC information.

Inspect the engine coolant level. Verify that the cooling system is operating correctly.

If you suspect a condition with engine cooling system, refer to Section 1D1, Engine Cooling.

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. DTC P0116 should not set.

Circuit/System Testing

Ignition OFF, disconnect the ECT sensor.
Ignition ON, verify that the ECT sensor parameter is at -40°C (-40°F).

If greater than -40°C (-40°F), test the signal circuit of the ECT sensor for a short to ground. If the circuit/connections test normal, replace the ECM.

Ignition OFF, remove the fuse that supplies B+ to circuit terminal to the ECM.

Notice : Do NOT use a test lamp to test the continuity of the circuit amage to the control module may occur due to excessive current draw.

Important : The control module or the sensor may be damaged if the circuit is shorted to battery positive voltage.

Test for less than 5 ohms between the low reference circuit terminal and a known ground.

If greater than 5 ohms, test the low reference circuit for an open/high resistance, or for a short to voltage. If the circuit/connections test normal, replace the ECM.

Ignition OFF, install the fuse that supplies B+ to circuit terminal to the ECM.
Ignition ON, install a 3-amp fused jumper wire between the signal circuit and the low reference circuit of the ECT sensor and verify the ECT sensor parameter is greater than 142°C (288°F).

If less than 143°C (289°F), test the signal circuit of the ECT sensor for a short to voltage or an open/high resistance. If the circuit/connections test normal, replace the ECM.

If all circuits/connections test normal, test or replace the ECT sensor.

Component Testing

Ignition OFF, disconnect the harness connector of the engine coolant temperature (ECT) sensor.

Important : A thermometer can be used to test the sensor off the vehicle.

Test the ECT sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Temperature vs Resistance - Intake Air Temperature (IAT) Sensor table and verify that the resistance is within 5 percent of the specification.

If the resistance vs temperature is not within 5 percent, replace the ECT sensor.

Diagnostic Trouble Code (DTC) P0117, P0118 or P1258

DTC Descriptor

DTC P0117 : Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage

DTC P0118 :Engine Coolant Temperature (ECT) Sensor Circuit High Voltage

DTC P1258 : Engine Coolant Temperature Mode

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
ECT Sensor Signal	P0117	P0118, P0119	P0118, P0119¹	P0116
Low Reference	-	P0118, P0119	P0118, P0119¹	P0116
¹ Sensor or ECM damage may occur if the circuit is shorted to B+

Circuit Description

The following table illustrates the difference between temperature, resistance, and voltage:

ECT	ECT Resistance	ECT Signal Voltage
Cold	High	High
Warm	Low	Low

Conditions for Running the DTC

P0117

The engine is operating.
The start up intake air temperature (IAT) is lessthan 72°C (161°F).

The start up intake air temperature (IAT) is morethan 72°C (161°F).
The engine run time is more than 59 seconds.
The DTC runs continuously once the above condition are met.

P0118

The ignition is ON or the engine is operating.
The DTC runs continuously once the above condition is met.

P1258

The ignition is ON or the engine is operating.
The DTC runs continuously once the above condition is met.

Conditions for Setting the DTC

P0117

The ECM detects that the ECT is more than 140°C (284°F) for more than 4 seconds.

P0118

The ECM detects that the ECT is less than -42°C (-43.6°F) for more than 4 seconds. The scan tool is limited to -40°C (-40°F), so the diagnostic procedure uses -39°C (-38°F) to determine if there is an ECT condition.

P1258

The ECM detects that the ECT is greater than 1312°C (268°F) for longer than 2 seconds.

Action Taken When the DTC Sets

DTC P0117, P0118 and P1258 are Type E DTCs.

Conditions for Clearing the MIL/DTC

DTC P0117, P0118 and P1258 are Type E DTCs.

Diagnostic Aids

Test the ECT sensor at various temperature levels in order to evaluate the possibility of a skewed sensor. A skewed sensor can result in a DTC or a driveability condition. Refer to Temperature VS Resistance - Engine Coolant Temperature (ECT) Sensor.
If the vehicle has sat overnight, the IAT sensor and the ECT sensor values should display within 3°C (5°F).
After starting a cold engine, the ECT sensor temperature should rise steadily, then stabilize after the thermostat opens.
High resistance in the circuits of either the ECT or IAT sensor could set a DTC.

Circuit/System Verification

Engine idling for 1 minute. Observe the DTC information with a scan tool. DTC P0117, P0118 and P1258 should not set.

Circuit/System Testing

Ignition OFF, disconnect the ECT sensor.
Ignition ON, verify that the ECT sensor parameter is at −40°C (−40°F).

If greater than the specified range, test the signal circuit for a short to ground. If the circuit/connections test normal, replace the ECM.

Notice : Do NOT use a test lamp to test the continuity of the circuit. Damage to the control module may occur due to excessive current draw.

Important :

The ECT sensor shares its low reference circuit with other sensors. If the low reference circuit internal to the ECM is open, 1–5 volts will be measured on the low reference circuit due to a backfeed condition through the other sensors.
The control module or the sensor may be damaged if the circuit is shorted to B+.

Test for less than 5 volts between the low reference circuit terminal and a known ground.

If greater than the specified range, repair the low reference circuit for a short to B+ and replace the ECM.

Ignition OFF, remove the fuse that supplies B+ to the ECM.
Test for less than 5 ohms between the low reference circuit terminal and a known ground.

If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.

Install the fuse that supplies B+ to the ECM.
Ignition ON, install a 3-A fusible link wire between the signal circuit terminal and the low reference circuit terminal, Verify the ECT sensor parameter is greater than 142°C (288°F).

If less than specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit/connections test normal, replace the ECM.

If all circuits/connections test normal, test or replace the ECT sensor.

Component Testing

Ignition OFF, disconnect the harness connector of the engine coolant temperature (ECT) sensor.

Important : A thermometer can be used to test the sensor off the vehicle.

Test the ECT sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Temperature VS Resistance - Intake Air Temperature (IAT) Sensor. Verify that the resistance is within 5 percent of the specification.

If the resistance vs temperature is not within 5 percent, replace the ECT sensor.

Diagnostic Trouble Code (DTC) P0121, P0122, P0123, P0221, P0222, or P0223

DTC Descriptor

DTC P0121 : Throttle Position (TP) Sensor 1 Performance

DTC P0122 : Throttle Position (TP) Sensor 1 Circuit Low Voltage

DTC P0123 : Throttle Position (TP) Sensor 1 Circuit High Voltage

DTC P0221 : Throttle Position (TP) Sensor 2 Performance

DTC P0222 : Throttle Position (TP) Sensor 2 Circuit Low Voltage

DTC P0223 : Throttle Position (TP) Sensor 2 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
5-Volt Reference	P0122, P0222, P2127	P0121, P0122, P0221, P2101, P2176	P0223, P2101, P2138, P2128, P2119	P0121, P0221
TP Sensor Signal 1	P0122	P0122	P0123	P0121
TP Sensor Signal 2	P0222	P0222	P0223, P0638, P2128, P2138	P0221
Low Reference	-	P0121, P0123, P0221, P0223, P2176	P0123, P02231¹	P0121, P0221
¹ Internal ECM or TP sensor damage may occur if the circuit is shorted to B+

Circuit Description

The throttle body assembly contains 2 throttle position (TP) sensors. The TP sensors are mounted to the throttle body assembly and are not serviceable. The TP sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM) supplies the TP sensors with a common 5-volt reference circuit, a common low reference circuit, and two independent signal circuits. The TP sensors have opposite functionality. TP sensor 1 signal voltage increases from below 1 volt at idle to above 4 volts at wide open throttle (WOT). TP sensor 2 signal voltage decreases from above 4 volts at idle to below 1 volt at WOT.

Conditions for Running the DTC

DTC P0121

The ignition 1 voltage is more than 7 volts.
The TP sensor 1 voltage is between 0.17-4.6 volts.
DTC P0121 runs continuously once the above conditions are met.

DTCs P0122, P0123, P0222, and P0223

The ignition is ON, with the engine OFF, or the engine is operating.
The ignition 1 voltage is more than 7 volts.
DTC P0122 runs continuously once the above conditions are met.

DTC P0221

The ignition 1 voltage is more than 7 volts.
The TP sensor 2 voltage is between 0.15-4.8 volts.
DTC P0221 runs continuously once the above conditions are met.

Conditions for Setting the DTC

DTC P0121

The TP sensor 1 disagrees more than 9 percent from TP sensor 2. Or, TP sensor 1 disagrees more than 9 percent from the predicted value. Either condition exists for more than 4 seconds.

DTC P0122

The ECM detects the TP sensor 1 signal voltage is less than 0.18 volts for more than 4 second.

DTC P0123

The ECM detects the TP sensor 1 signal voltage is more than 4.6 volts for more than 4 seconds.

DTC P0221

The TP sensor 1 disagrees more than 9 percent from TP sensor 2. Or, TP sensor 2 disagrees more than 9 percent from the predicted value. The above conditions are met for more than 4 seconds.

DTC P0222

The ECM detects the TP sensor 2 signal voltage is less than 0.16 volts for more than 4 seconds.

DTC P0223

The ECM detects the TP sensor 2 signal voltage is less than 0.16 volts for more than 4 seconds.

Action Taken When the DTC Sets

DTCs P0121, P0122, P0123, P0221, P0222, and P0223 are Type E DTCs.

Conditions for Clearing the DTC

DTCs P0121, P0122, P0123, P0221, P0222, and P0223 are Type E DTCs.

Diagnostic Aids

If there is a condition with the TP sensors the ECM defaults to reduced power mode for the entire ignition cycle, even if the condition is corrected.

Circuit/System Verification

Ignition ON, clear the DTC Info with a scan tool.
Start the engine, observe the TP Sensor 1 and 2 voltage parameters with a scan tool. TP sensor 1 should be between 0.17–4.6 volts and TP sensor 2 should be between 0.15– 4.8 volts.
Observe the TP sensor 1 and 2 parameter while performing the following tests :

Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release pedal. Repeat the procedure several times.
Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times. The TP sensor 1 and 2 parameter should display Agree.

Observe the DTC Information with a scan tool. DTCs P0121, P0122, P0123, P0221, P0222, and P0223 should not set.

Circuit/System Testing

Ignition OFF, disconnect the throttle body harness connector.
Ignition OFF, test for 5 ohms or less of resistance between the low reference circuit and ground.

If greater than the specified value, test the low reference circuit for a short to voltage, or an open/high resistance. If the circuit/connections test normal, replace the ECM.

Ignition ON, load test for 4.8–5.2 volts between the test lamp probe connected to the 5-volt reference circuit and ground.

Important : The 5-volt reference circuits are internally and externally connected at the ECM. Other component DTCs may be set. If other DTCs are set, review the electrical schematic and diagnose the applicable circuits and components.

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/connections 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/connections test normal, replace the ECM.

Ignition ON, verify that each of the TP sensor voltage parameters is less than 0.3 volts.

If a TP sensor voltage parameter is greater than 0.3 volts, test the appropriate signal circuit for a short to voltage. If the circuit/connections test normal, replace the engine control module (ECM).

Connect a 3 amp fused jumper wire between the 5 volt reference circuit and each of the TP sensor signal circuits.
Observe each of the TP sensor voltage parameters with a scan tool when jumped to 5 volts. Both TP sensor voltage parameters should display 5.00 volts.

If TP sensor voltage parameter is less than 5.00 volts, test the appropriate signal circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.

Ignition OFF, remove the ECM fuse.

Notice : Do NOT use a test lamp to test the continuity of the circuit. Damage to the control module may occur due to excessive current draw.

Important : The control module or the sensor may be damaged if the circuit is shorted to battery positive voltage.

Test for 5 ohms or less between the low reference circuit and ground.

If greater than 5 ohms, test the low reference circuit for an open/high resistance or for a short to voltage. If the circuit/connections test normal, replace the ECM.

If all circuits/connections test normal, test or replace the throttle body assembly.

Diagnostic Trouble Code (DTC) P0125 or P0128

DTC Descriptor

DTC P0125 : Engine Coolant Temperature (ECT) Insufficient for Closed Loop

DTC P0128 : Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature

Diagnostic Fault Information

Perform the Diagnostic System Check prior to using this diagnostic procedure.

Circuit Description

The engine control module (ECM) monitors the temperature of the engine coolant for engine control and as an enabling criteria for some diagnostics. The amount of air flow into an engine is proportional to the amount of heat an engine generates. The ECM monitors the amount of air flow into the engine to calculate engine coolant temperature (ECT).

The ECM uses the calculated temperature to determine if the engine has warmed up to the closed loop temperature or to the thermostat regulating temperature. If the coolant temperature does not increase normally or does not reach the closed loop temperature, diagnostics that use the ECT as enabling criteria, may not run when expected.

Conditions for Running the DTC

P0125

DTCs P0112, P0113, P0117, P0118, P0480, P0481, P0691, P0692, P0693, and P0694 are not set.
The engine is operating.

P0128

Before the ECM can report DTC P0128 failed, DTC P0117 must run and pass.
DTCs P0101, P0102, P0103, P0112, P0113, P0118, P0722, or P0723 are not set.
The engine speed is more than 960 RPM.
The ECT is less than 71°C (160°F) at start up.
The calculated ambient air temperature is more than -11°C (-12°F) and less than 45°C (113°F).
The vehicle speed is more than 15 km/h (9 mph).
The air flow coming into the engine has accumulated to more than 2,000 grams.
DTC P0128 runs continuously once the above conditions have been met for approximately 15 minutes.

Conditions for Setting the DTC

P0125

The actual ECT is not within 10°C (18°F) of the calculated ECT after 2-5 minutes, which depends on the amount of air flow into the engine after start-up.

P0128

The ECM detects that the actual coolant temperature is 10°C (18°F) less than the calculated coolant temperature.
The condition exists for more than 4 seconds.

Action Taken When the DTC Sets

DTC P0125 and P0128 are Type E DTCs.

Conditions for Clearing the MIL/DTC

DTC P0125 and P0128 are Type E DTCs.

Diagnostic Aids

An engine that soaks for about 8 hours will help diagnosis the condition. After the cold soak, operate the vehicle at highway speeds for 20 minutes while monitoring the Calculated ECT - Thermostat parameter with a scan tool. If there is a condition, the calculated temperature will be 10°C (18°F) more then the actual engine coolant temperature.

Circuit/System Verification

Verify that the engine coolant level is correct.

If the engine coolant is not at the correct level, refer to Section 1D1, Engine Cooling.

Verify that the engine coolant temperature is at the normal operating temperature.

If the engine coolant temperature is below normal operating temperature, refer to Section 1D1, Engine Cooling.

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. DTC P0125 or P0128 should not set.
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 List.

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the ECT sensor.
Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit and ground.

If greater than 5 ohms, 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, using a scan tool verify that the ECT sensor parameter is at -40°C (-40°F).

If greater than -40°C (-40°F), test the signal circuit for a short to ground. If the circuit/connections test normal, replace the ECM.

Important : If the signal circuit of the ECT sensor is shorted to voltage the ECT sensor may be damaged.

Install a 3 amp fused jumper wire between the signal circuit and the low reference circuit. Verify the ECT sensor parameter is greater than 128°C (262°F).

If less than 128°C (262°F), test the signal circuit for a short to voltage or an open/high resistance. If the ircuit/connections test normal, replace the ECM.

If all circuits test normal, test or replace the ECT sensor.

Component Testing

Ignition OFF, disconnect the harness connector of the ECT sensor.

Important : Important: A thermometer can be used to the used to test the sensor off the vehicle.

Test the ECT sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Temperature vs Resistance - Intake Air Temperature (IAT) Sensor table and verify that the resistance is within 5 percent of the specification.

If the resistance vs. temperature is not within 5 percent, replace the ECT sensor.

Diagnostic Trouble Code (DTC) P0130 or P0150

DTC Descriptor

DTC P0130 : HO2S Circuit Closed Loop (CL) Performance Bank 1 Sensor 1

DTC P0150 : HO2S Circuit Closed Loop (CL) Performance Bank 2 Sensor 1

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
HO2S Bank 1 Sensor 1 Signal	P0131	P0130, P0134	P0132	P0130, P0133
HO2S Bank 1 Sensor 2 Signal	P0137	P0136, P0140	P0138	P0136, P0139
HO2S Bank 2 Sensor 1 Signal	P0151	P0150, P0154	P0152	P0150, P0153
HO2S Bank 2 Sensor 2 Signal	P0157	P0156, P0160	P0158	P0156, P0159
Low Reference	-	P0130, P0136, P0150, P0156	P0134, P0140, P0154, P0160	-

Circuit Description

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. The control module supplies the HO2S with a reference, or bias voltage of about 450 mV. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1,000 mV. This voltage will fluctuate above and below the bias voltage. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases above bias voltage toward 1,000 mV indicates a rich fuel mixture. An HO2S voltage that decreases below bias voltage toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the control module to calculate the air-to-fuel ratio sooner.

Conditions for Running the DTC

P0130 ,P0150

The ignition voltage is between 10–16 volts.
The engine is operating.

Conditions for Setting the DTC

P0130 or P0150

The ECM detects that the H02S voltage is low.

Action Taken When the DTC Sets

DTCs P0130 and P0150 are Type E DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0130 and P0150 are Type E DTCs.

Circuit/System Verification

Engine idling, observe the appropriate HO2S voltage parameter. The reading should fluctuate above and below the range of 350-550 mV.
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

Ignition OFF, disconnect the harness connector at the appropriate HO2S sensor.
Ignition ON, verify that the HO2S parameter is between 350–500 mV.

If less than 350 mV, test the signal circuit for a short to ground. If the circuit/connections test normal, replace the ECM.
If greater than 500 mV, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.

Ignition OFF, test for 5 ohms or less between the low reference circuit of the HO2S sensor and ground.

If greater than 5 ohms, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.

Install a 3-amp fused jumper wire between the signal circuit and the low reference circuit of the HO2S sensor and verify the HO2S sensor parameter is less than 60 mV.

If greater than 60 mV, test the signal circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.

If all circuits/connections test normal, replace the HO2S sensor.

Diagnostic Trouble Code (DTC) P0131 or P0151

DTC Descriptor

DTC P0131 :HO2S Circuit Low Voltage Bank 1 Sensor 1

DTC P0151 :HO2S Circuit Low Voltage Bank 2 Sensor 1

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
HO2S Bank 1 Sensor 1 Signal	P0131	P0130, P0134	P0132	P0130, P0133
HO2S Bank 1 Sensor 2 Signal	P0137	P0136, P0140	P0138	P0136, P0139
HO2S Bank 2 Sensor 1 Signal	P0151	P0150, P0154	P0152	P0150, P0153
HO2S Bank 2 Sensor 2 Signal	P0157	P0156, P0160	P0158	P0156, P0159
Low Reference	-	P0130, P0136, P0150, P0156	P0134, P0140, P0154, P0160	-

Circuit Description

Conditions for Running the DTC

P0130 ,P0150

The ignition voltage is between 10–16 volts.
The engine is operating.

Conditions for Setting the DTC

P0130 or P0150

The ECM detects that the H02S voltage is low.

Action Taken When the DTC Sets

DTCs P0131 and P0151 are Type E DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0131 and P0151 are Type E DTCs.

Circuit/System Verification

Engine idling, observe the HO2S voltage parameter. The voltage should fluctuate above and below the range of 350–550 mV.
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

Ignition OFF, disconnect the harness connector at the appropriate HO2S sensor.
Ignition ON, verify that the HO2S voltage parameter is between 350-500 mV.

If less than 350 mV, test the signal circuit for a short to ground. If the circuit/connections test normal, replace the ECM.
If greater than 500 mV, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.

Ignition OFF, test for 5 ohms or less between the low reference circuit and ground.

If greater than 5 ohms, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.

Install a 3-amp fused jumper wire between the signal circuit and the low reference circuit and verify the HO2S voltage parameter is less than 60 mV.

If greater than 60 mV, test the signal circuit of the HO2S sensor for an open/high resistance. If the circuit/connections test normal, replace the ECM.

Verify that the following conditions do not exist :

Lean fuel injectors
Low fuel system pressure
Fuel that is contaminated
Exhaust leaks near the HO2S
Engine vacuum leaks

If you find any of the above conditions, repair as necessary.

If all circuits/connections test normal, replace the HO2S sensor.

Diagnostic Trouble Code (DTC) P0132 or P0152

DTC Descriptor

DTC P0132 :HO2S Circuit High Voltage Bank 1 Sensor 1

DTC P0152 : HO2S Circuit High Voltage Bank 2 Sensor 1

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
HO2S Bank 1 Sensor 1 Signal	P0131	P0130, P0134	P0132	P0130, P0133
HO2S Bank 1 Sensor 2 Signal	P0137	P0136, P0140	P0138	P0136, P0139
HO2S Bank 2 Sensor 1 Signal	P0151	P0150, P0154	P0152	P0150, P0153
HO2S Bank 2 Sensor 2 Signal	P0157	P0156, P0160	P0158	P0156, P0159
Low Reference	-	P0130, P0136, P0150, P0156	P0134, P0140, P0154, P0160	-

Circuit Description

Conditions for Running the DTC

P0132 or P0152

The ignition voltage is between 10–16 volts.
The engine is operating.

Conditions for Setting the DTC

P0132 or P0152

The ECM detects that the H02S voltage is high.

Action Taken When the DTC Sets

DTCs P0132 and P0152 are Type E DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0132 and P0152 are Type E DTCs.

Circuit/System Verification

Engine idling, observe the HO2S voltage parameter. The voltage should fluctuate above and below the range of 350–550 mV.
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

Ignition OFF, disconnect the harness connector at the appropriate HO2S sensor.
Ignition ON, verify that the HO2S voltage parameter is between 350–500 mV.

If less than 350 mV, test the signal circuit for a short to ground. If the circuit/connections test normal, replace the ECM.
If greater than 500 mV, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.

Ignition OFF, test for 5 ohms or less between the low reference circuit and ground.

If greater than 5 ohms, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.

Install a 3-amp fused jumper wire between the signal circuit and the low reference circuit and verify the HO2S voltage parameter is less than 60 mV.

If greater than 60 mV, test the signal circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.

Verify that the following conditions do not exist :

Lean fuel injector
High fuel system pressure
Fuel that is contaminated
Restricted exhaust

If you find any of the above conditions, repair as necessary.

If all circuits/connections test normal, replace the HO2S sensor.