P0132

DTC P0132:

Heated Oxygen Sensor Wiring Schematic:

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) supplies a voltage of about 0.45 volt (450 mV) between terminals "BD2" and "BD3". (If measured with a 10 Mega ohm digital voltmeter, this may read as low as 0.32 volt.) The heated oxygen sensor (HO2S) varies the voltage within a range of between about 1 volt (1000 mV) if the exhaust is rich, to about 0.10 volt (100 mV) if exhaust is lean. The sensor is like an open circuit and produces no voltage when it is below about 360°C (600°F). DTC P0131, P0132, P0134 or a cold sensor causes "Open Loop" operation.

DIAGNOSTIC TROUBLE CODE (DTC) PO132 WILL SET WHEN
^ The HO2S signal voltage on CKT 412 remains above 750 mV for 2 minutes while in "Closed Loop."
^ Throttle angle between 6% and 40%.
^ No DTC P0122 or P0123.

ACTION TAKEN (PCM WILL DEFAULT TO)
A current DTC P0132 will cause the system to operate in "Open Loop." With DTC P0132 set, the Malfunction Indicator Lamp (MIL) (Service Engine Soon) will be illuminated.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

1. Determines if conditions necessary to set DTC P0132 exist.
2. When grounding CKTs 412 and 413. The tech 1 scan tool should read below 0.35 volts. If not, CKT 412 may be shorted to voltage.

DIAGNOSTIC AIDS

Fuel Pressure
System will go rich if pressure is too high. The PCM can compensate for some increase. However, if it gets too high, DTC P0132 may be set. Refer to CHART A-7 Fuel System Diagnosis. Related Tests, Information and Procedures

Rich Injector
Perform injector balance test CHART C-2A. Chart C-2A Fuel Injector Balance Test

Leaking Injector
Refer to CHART A-7. Related Tests, Information and Procedures

Check for fuel contaminated oil.

Evaporative Emissions (EVAP) Canister Purge
Check for fuel saturation. If full of fuel, check canister control and hoses.

Mass Air Flow (MAF) Sensor
An output that causes the PCM to sense a higher than normal air flow can cause the system to go rich. Disconnecting the MAF sensor will allow the PCM to set a fixed value for the sensor. Substitute a different MAF sensor if the rich condition is gone while the sensor is disconnected.

Check for leaking fuel pressure regulator diaphragm by checking vacuum line to regulator for fuel.

Throttle Position (TP) Sensor
An intermittent TP sensor output will cause the system to go rich due to a false indication of the throttle moving.

Heated Oxygen Sensor (HO2S)
If the HO2S is internally shorted the HO2S voltage displayed on a Tech 1 will be over 1 volt. Try disconnecting the HO2S with the key "ON," engine "RUNNING;" if the displayed voltage goes from over 1000 mV to around 450 mV, replace the HO2S.

False rich indication due to silicon contamination of the heated oxygen sensor. This will be indicated by DTC P0131 accompanied by lean driveability conditions and a powdery white deposit on the sensor.

Faulty HO2S Heater or Heater Circuit
See Diagnostic Aids for DTC P0134. P0134