P0132

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

IMPORTANT: If the voltage is measured with a 10 megaohm Digital Voltmeter, the voltage may read as low as 0.32 volt (320 mV).

The VCM supplies a voltage of about 0.45 volt (450 mV) between the HO2S signal and HO2S Low circuits. The Heated Oxygen Sensor varies the voltage within the range of about 1.0 volt (1000 mV) if the exhaust is rich, down to about 0.10 volt (100 mV) if the exhaust is lean.

The sensor is like an open circuit and produces no voltage when it is below 360°C (600°F). The DTC P0131, P0132, an open signal circuit, or a cold sensor causes Open Loop operation. The DTC P0132 determines if the HO2S or the signal circuit is shorted to voltage by checking for a rich condition during a steady throttle.

CONDITIONS FOR SETTING THE DTC

^ No TP sensor DTCs

^ No EVAP DTCs

^ No IAT sensor DTCs

^ No MAP sensor DTCs

^ No ECT sensor DTCs

^ No MAF sensor DTCs

^ No intrusive test in progress

^ No device controls active

^ The system voltage measures at least 9.0 volts

Test Enable Rich Test

^ A Closed Loop

^ Air to fuel ratio is between 14.5-14.8

^ The TP is between 0-50%

^ The above must meet for 5 seconds

^ The HO2S voltage measures greater than 976 mV (0.976 V)

Test Enable DFCO Rich Test

^ Decel Fuel cutoff mode is active

^ A Closed Loop

^ The time elapsed is at least 2 seconds

^ The HO2S voltage measures greater than 466 mV (0.468 V)

ACTION TAKEN WHEN THE DTC SETS

A current DTC P0132 causes the system to operate in the Open Loop. With a current DTC P0132 set, the MIL turns ON after 1 test failure.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The VCM turns the MIL OFF after 3 consecutive drive trips when the test has Run and Passed and not Failed.

^ A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 22°C (40°F) from the start-up coolant temperature and the engine coolant temperature exceeds 70°C (160°F) during the same ignition cycle).

^ Use the scan tool Clear Information function.

^ Disconnect the VCM battery feed for 30 seconds.

DIAGNOSTIC AIDS

IMPORTANT: Never solder the HO2S wires. For proper wire and connector repair, refer to Wiring Repairs.

Check the following items:

^ The fuel pressure: If the pressure is too high, the system will run rich. The VCM can compensate for some increase; however, if the pressure gets too high, the DTC P0132 may set. Refer to Fuel System Diagnosis. System Diagnosis - Fuel System

^ A rich injector. Perform an Injector Balance test. Refer to Fuel Injector Coil Test. Fuel Injector Coil Test

^ A leaking injector. Refer to Fuel System Diagnosis. System Diagnosis - Fuel System

^ Fuel contaminated oil.

^ EVAP canister purge: Check for a fuel saturation. If full of fuel, check the canister control and hoses. Refer to Fuel System Cleaning.

^ Leaking fuel pressure regulator diaphragm by checking the vacuum line to the regulator for fuel.

^ The TP sensor: An intermittent TP sensor output causes the system to run rich due to a false indication of the throttle moving.

^ False rich indication due to silicon contamination of the heated oxygen sensor. A DTC P0132 accompanied by a lean driveability conditions and a powdery white deposit on the sensor indicates a false rich indication.

TEST DESCRIPTION

The number below refers to the step number on the diagnostic table.

2. This test determines if the conditions exist in order to set the DTC P0132.

3. If the HO2S is internally shorted, the HO2S (Bank 1, Sensor 1) voltage displayed on a scan tool will be over 1.0 volt (1000 mV).