DTC P0132 HO2S Circuit High Voltage Bank 1 Sensor 1

Circuit Description

The PCM supplies a voltage of about 450 mV between the HO2S high and low signal circuits. The oxygen sensor varies the voltage over a range from about 1000 mV when the exhaust is rich, down through about 10 mV when the exhaust is lean.

The PCM monitors and stores the heated oxygen sensor (HO2S) voltage information. The PCM evaluates the HO2S voltage samples in order to determine the amount of time the HO2S voltage was out of range. The PCM compares the stored HO2S voltage samples taken within each sample period and determines if majority of the samples are out of the operating range.

The PCM monitors the HO2S voltage for being fixed above a predetermined voltage. If the PCM detects the voltage is above a predetermined voltage, a DTC will set.

Conditions for Running the DTC

Criteria 1
• DTCs P0101, P0102, P0103, P0112, P0113, P0117, P0118, P0125, P0335, P0336, P0351-P0358, P1120, P1220, P1221, P1258, not set.
• The engine coolant temperature is greater than 48°C (118°F).
• The ignition voltage is greater than 9.0 volts.
• The fuel system operating in Closed Loop.
• The AIR and the Catalyst diagnostics are not active.
• The fuel trim learn is enabled.
• The air/fuel ratio is between 14.5:1 and 14.7:1.

OR

Criteria 2
• DTCs P0101, P0102, P0103, P0112, P0113, P0117, P0118, P0125, P0335, P0336, P0351-P0358, P1120, P1220, P1221, P1258, not set.
• The ignition voltage is greater than 9.0 volts.
• The AIR and the Catalyst diagnostics are not active.
• Deceleration Fuel Cut-off mode is enabled for greater than 1.0 second.

Conditions for Setting the DTC

Criteria 1
• The HO2S signal voltage remains above 775 mV.
• The Criteria 1 conditions are present for 31 seconds.

OR

Criteria 2
• The HO2S signal voltage remains above 540 mV .
• The Criteria 2 condition are present for 4.5 seconds during Deceleration Fuel Cut-off .

Action Taken When the DTC Sets

• The PCM illuminates the Malfunction Indicator Lamp on the second consecutive drive trip that the diagnostic runs and fails.
• The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive drive trip, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure records.
• Open Loop Fueling.

Conditions for Clearing the MIL/DTC

• The PCM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
• A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
• A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
• Use a scan tool in order to clear the MIL and the DTC.

Diagnostic Aids

Important

Remove any debris from the PCM\TAC module connector surfaces before servicing the PCM\TAC module. Inspect the PCM\TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent water intrusion into the PCM\TAC modules.

• Check the HO2S electrical connections for evidence of water intrusion. Water present in the connector causes the B+ supply to the heater to bleed over to the signal circuit.
• Fuel pressure: The system goes rich if the pressure is too high. The PCM compensates for some increase. However, if the fuel pressure is too high, a DTC may set. Refer to Fuel System Diagnosis .
• Rich injector(s): Perform the Injector Balance Test.
• Leaking injector: Refer to the Fuel System Diagnosis .
• Evaporative emissions (EVAP) canister purge. Check for fuel saturation. If full of fuel, check the canister control and hoses. Refer to Evaporative Emission (EVAP) Control System Operation Description .
• MAF sensor: Disconnect the MAF sensor and see if the rich condition is corrected. If so, check for proper installation. If installed OK, replace the MAF sensor. If the MAF sensor is installed backwards, the system goes rich. The plastic portion of the sensor has arrows cast into it indicating proper air flow direction. The arrows must point towards the engine.
• An oxygen supply inside the HO2S is necessary for proper operation. The HO2S wires provides the supply of oxygen. Inspect the HO2S wires and connections for breaks or contamination. Refer to Body and Accessories/Wiring Systems.
• Check for a leaking fuel pressure regulator diaphragm by checking the line to the regulator for fuel.
• TP sensor: An intermittent TP sensor output causes the system to go rich, due to a false indication of the engine accelerating. For an intermittent condition, refer to Symptoms .

Test Description

The numbers below refer to the step numbers on the diagnostic table.