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 P0131 determines if the HO2S sensor or the signal circuit is shorted to low by checking for a lean condition during a steady throttle and power enrichment (PE).

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 is at least 9.0 volts

Test Enable (Rich Test)

^ Closed Loop

^ Air to fuel ratio is at least 14.5 but less than 14.8

^ The TP is greater than 0% but less than 50%

^ The above must be met for 5 seconds

^ The HO2S voltage is greater than 0.976 volts (976 mV)

Test Enable (DFCO Rich Test)

^ Closed Loop

^ Decel Fuel Cutoff mode is active

^ The HO2S voltage measures greater than 0.468 volts (486 mV)

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 startup 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

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 Balance Test. Fuel Injector Balance Test

^ Fuel contaminated oil.

^ EVAP canister purge: Check for a fuel saturation. It full of fuel, check the canister control and hoses. Refer to EVAP Control System Diagnosis. System Diagnosis - EVAP Control

^ 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.

^ Faulty HO2S (Bank 1, Sensor 1): the HO2S (Bank 1, Sensor 1) is internally shorted, the HO2S (Bank 1, Sensor 1) voltage displayed on a scan tool will be over 1.0 volt (1000 mV). Try disconnecting the HO2S (Bank 1, Sensor 1), if the displayed voltage goes from over 1000 mV to around 450 mV, replace the HO2S (Bank 1, Sensor 1).

Never solder the HO2S wires. For proper wire and connector repair, refer to Wiring Repairs in Engine Electrical.

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