P0132
CIRCUIT DESCRIPTIONThe powertrain control module (PCM) supplies a voltage of approximately 450 mV between the HO2S high and low signal circuits. The heated oxygen sensor varies the voltage from approximately 1,000 mV when the exhaust is rich, to approximately 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 the 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 sets.
CONDITIONS FOR RUNNING THE DTC
^ DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0200, P0300, P0410, P0440, P0442, P0446, P0452, P0453, P1120, P1125, P1220, P1221, P1258, P1415, P1416, P1441, P1514, P1515, P1516, P1517, or P1518 are not set.
^ The ignition 1 signal is between 9-18 volts.
^ The fuel tank level remaining is more than 10 percent.
^ The loop status is Closed.
^ Intrusive tests are not in progress.
^ Scan tool output controls are not active.
Rich Test Enable
^ The air fuel ratio is between 14.5:1 and 14.7:1
^ The throttle position (TP) indicated angle is between 3-70 percent more than the value observed at idle.
Decel Fuel Cut-off Test Enable
^ Decel fuel cut-off is active.
^ The above condition is met for 1 second.
CONDITIONS FOR SETTING THE DTC
Rich Test
The HO2S voltage is more than 775 mV for 165 seconds.
Decel Fuel Cut-off Test
The HO2S voltage is more than 540 mV for 5 seconds.
ACTION TAKEN WHEN THE DTC SETS
^ The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
^ The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
^ The control module commands Open Loop.
CONDITIONS FOR CLEARING THE MIL/DTC
^ The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
^ A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
^ Clear the MIL and the DTC with a scan tool.
DIAGNOSTIC AIDS
IMPORTANT:
^ Before you service the PCM and the throttle actuator control (TAC) module, remove any debris from the module connector surfaces. Inspect the module connector gaskets when you diagnose or replace the modules. Check the gaskets for correct installation. The gaskets prevent contaminate intrusion into the PCM and the TAC modules.
^ Use the J 35616-A Connector Test Adapter Kit, or use any test that requires probing the PCM or probing a component harness connector. Using this kit prevents damage to the harness and component terminals. Refer to Using Connector Test Adapters in Diagnostic Aids.
^ Check the HO2S electrical connections for evidence of water intrusion. Water in the connector causes the B+ supply to the heater to bleed into the signal circuit.
^ Check the fuel pressure. The system goes rich if the pressure is too high. The PCM compensates for some increase. If the fuel pressure is too high, a DTC may set. Refer to Fuel System Diagnosis. Component Tests and General Diagnostics
^ Check for rich injectors. Perform the Injector Balance Test. Refer to Fuel Injector Balance Test with Tech 2 or Fuel Injector Balance Test with Special Tool. Component Tests and General Diagnostics Component Tests and General Diagnostics
^ Check for leaking injectors. Refer to the Fuel System Diagnosis. Component Tests and General Diagnostics
^ Check the evaporative emissions (EVAP) canister purge. Inspect for fuel saturation. If the canister is full of fuel, inspect the canister control and the hoses. Refer to Evaporative Emission (EVAP) Control System Description.
^ Check the MAF sensor. Disconnect the MAF sensor and see if the rich condition is corrected. If the condition is corrected, inspect for proper installation. If the MAF sensor is correctly installed, replace it. If the MAF sensor is installed backwards, the system goes rich. The plastic portion of the sensor has arrows that indicate the proper air flow direction. The arrows must point toward the engine.
^ Check the oxygen supply inside the HO2S for proper operation. The HO2S wires provide the supply of oxygen. Inspect the HO2S wires and connections for breaks, or for contamination. Refer to Wiring Repairs in Diagnostic Aids.
^ Check for an intermittent condition. Refer to Intermittent Conditions. Intermittent Conditions
TEST DESCRIPTION
Steps 1-4:
Steps 5-12:
The numbers below refer to the step numbers on the diagnostic table.
2. If the voltage is fixed above the specified value, the condition is present.
3. Using the Freeze Frame/Failure Records data may help to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can help to determine how many miles have occurred since the DTC set. The Fail Counter and Pass Counter can also help to determine how many ignition cycles that the diagnostic reported a pass and/or a fail. Operate the vehicle within the same Freeze Frame conditions that the PCM recorded:
^ The RPM
^ The vehicle load
^ The vehicle speed
^ The temperature
This procedure isolates when the DTC failed.
4. If the voltage remains high, the signal circuit is shorted to voltage.