P0132
P0132 O2 Bank 1 Sensor 1 High Voltage
Circuit Description
The powertrain control module (PCM)/engine control module (ECM) supplies a voltage of about 0.45 volts between terminals C15 and C14 (if measured with a 10 megohm digital voltmeter, this may read as low as 0.32 volts). The Oxygen Sensor (O2S) varies the voltage within a range of about 1 volt if the exhaust is rich, down through about 0.10 volt if the exhaust is lean.
The sensor is like and open circuit and produces no voltage when it is below 600 °F (315 °C). An open sensor circuit or cold sensor causes Open Loop operation.
If the O2S sensor pigtail wiring, connector or terminal are damaged, the entire O2S assembly must be replaced. Do not attempt to repair the wiring, connector or terminals. In order for the sensor to function properly, it must have a clean air reference provided to it. This clean air reference is obtained by way of the O2S wire(s). Any attempt to repair the wires, connector or terminals could result in the obstruction of the air reference and degrade the O2S performance. Refer to "Oxygen Sensor".
Conditions for Setting the DTC
- O2S voltage is greater than 0.952 volts or 0.448 volts in Decel Fuel Cutoff (DFCO) mode.
- Closed loop stoichiometry.
- Engine Coolant Temperature (ECT) is greater than 140 °F (60 °C).
- Air/fuel ratio is between 14.5:1 and 14.8:1.
- Throttle Position (TP) Sensor is between 0% and 95%.
- No related malfunctions (see P0131).
- 2 seconds delay for closed loop.
Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The PCM/ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
- A history Diagnostic Trouble Code (DTC) is stored.
- Vehicle will operate in Open Loop.
Conditions for Clearing the MIL/DTC
- The MIL will turn off after three consecutive ignition cycles in which the diagnostic runs without a fault.
- A history DTC will clear after 40 consecutive warm-up cycles without a fault.
- DTC(s) can be cleared by using the scan tool.
Diagnostic Aids
The DTC P0132 or rich exhaust is most likely caused by one of the following items:
Fuel pressure - System will go rich if fuel pressure is too high. The PCM/ECM can compensate for some increase. However, if it gets too high, a DTC P0132 will be set.
Leaking injector - A leaking or malfunctioning injector can cause the system to go rich causing a DTC P0132.
MAP sensor - An output that causes the PCM/ECM to sense a higher than normal manifold pressure (low vacuum) can cause the system to go rich. Disconnecting the MAP sensor will allow the PCM/ECM to substitute a fixed value for the MAP sensor Substitute a different a MAP sensor, if the rich condition is gone while the sensor is disconnected.
Pressure regulator - Check for a leaking fuel pressure regulator diaphragm by checking for the presence of liquid fuel in the vacuum line to the regulator.
TP sensor - An intermittent TP sensor output will cause the system to go rich due to a false indication of the engine accelerating.
O2S contamination - Inspect the O2S for silicone contamination from fuel or use of improper room temperature vulcanizing (RTV) sealant. The sensor may have a white powdery coating and result in a high but false voltage signal (rich exhaust indication). The PCM/ECM will then reduce the amount of fuel delivered to the engine causing a severe surge or driveability problem.
Step 1 - 6:
Step 7 - 8:
Test Description
Number(s) below refer to the step number(s) on the Diagnostic Table.
1. The On-Board Diagnostic (OBD II) System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on the scan tool for later reference.
2. This step determines if DTC P0132 is the result of a hard failure or an intermittent condition. It may be necessary to operate the vehicle within the Freeze Frame conditions and Conditions for Setting the DTC in order to duplicate the malfunction detected by the PCM/ECM.
4. This step simulates a DTC P0131. If the PCM/ECM senses the change, the PCM/ECM and the wiring are OK.
6. The replacement PCM/ECM must be reprogrammed. Refer to the latest Techline procedure for PCM/ECM reprogramming.
8. If no malfunctions have been found at this point and no additional DTCs were set, refer to "Diagnostic Aids" for additional checks arid information.