P0132

Schematic:

CIRCUIT DESCRIPTION
The Heated Oxygen Sensor (HO2S) produces a voltage that varies between 100-900 mV. The Powertrain Control Module (PCM) monitors this voltage and determines from the exhaust oxygen content if the air/fuel mixture is correct. If the voltage input at the PCM is about 100 mV, the HO2S indicates a lean air/fuel mixture. If the voltage input is about 900 mV, the HO2S indicates a rich air/fuel mixture. The PCM constantly monitors the HO2S signal during closed-loop operation, and corrects the air/fuel mixture by changing the fuel-injector pulse width. A DTC P0132 will be set if the HO2S 1 voltage remains excessively high for an extended period of time.

CONDITIONS FOR RUNNING THE DTC
^ The barometric pressure is more than 75 kPa.
^ The intake air temperature is between -10°C and +70°C (14°F - 158°F).
^ The fuel tank level is more than 25 percent.
^ The engine coolant temperature is above 80°C (176°F).
^ The vehicle speed exceeds 50 km/h (30 mph) for 2 minutes, after which the vehicle is idled for 2 minutes.
^ The engine is running at a steady speed.

CONDITIONS FOR SETTING THE DTC
The minimum HO2S voltage is more than 600 mV.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM illuminates the Malfunction Indicator Lamp (MIL) after two consecutive ignition cycles in which the diagnostic runs with the fault active.
^ The PCM records the operating conditions at the time that the diagnostic fails. This information is stored in the Freeze Frame buffer.

CONDITIONS FOR CLEARING THE DTC
^ The MIL turns OFF after 3 consecutive trips during which the diagnostic runs and does not detect a fault.
^ A History DTC clears after 40 consecutive warm-up cycles without a fault.
^ Use the Clear DTC Information function of the scan tool, or disconnect the PCM battery feed in order to clear the DTC.

DIAGNOSTIC AIDS
DTC P0132 is likely to set during city driving. Avoid operating the vehicle on the highway when validating a DTC P0132.

Clear the DTCs. Road-test the vehicle while monitoring the HO2S test, which is found on the scan tool in the MIL/System Status selection under System Information. When the scan tool indicates YES, check for DTC P0132 under Last Test Failed. If DTC P0132 is not listed, the condition is intermittent, and the HO2S system is OK at this time.

Check for any of the following conditions:
^ Check for good PCM-to-engine electrical grounds.
^ Incorrect fuel pressure. The fuel mixture can become too rich if the fuel pressure is too high, and DTC P0132 may set. Refer to Fuel System Diagnosis. Component Tests and General Diagnostics
^ A fuel injector that is leaking or incorrectly calibrated
^ A saturated EVAP canister or a faulty EVAP purge control. Refer to EVAP Control System Diagnosis. Component Tests and General Diagnostics
^ A leaking fuel-pressure regulator. Fuel that leaks past the fuel-pressure regulator diaphragm can enter the engine through the vacuum passage to the regulator and cause a rich condition. A shorted HO2S. An HO2S that is shorted to voltage will display a reading of more than 1.0 volt on the scan tool.
^ Water contamination of the HO2S can cause high HO2S voltage. A DTC P0132 that occurs more frequently if driving through standing water or operating the vehicle in wet driving conditions can indicate water intrusion. Replace the HO2S if the sensor is affected by moisture. A faulty electrical connection to the PCM
^ An intermittent malfunction may be caused by a fault in the HO2S 1 electrical circuit.

Inspect the wiring harness and the components for any of the following conditions: Backed out terminals
^ Incorrect mating of terminals
^ Broken electrical connector locks
^ Incorrectly formed terminals or damaged terminals
^ Faulty terminal-to-wire connections
^ Physical damage to the wiring harness
^ A broken wire inside the insulation
^ Corrosion of electrical connections, of splices, or of terminals
^ If DTC P0132 cannot be duplicated, the Freeze Frame data can be useful in determining the vehicle operating conditions when the DTC first set.