P0132

DTC P0132 Heated Oxygen Sensor (HO2S 1) Circuit High Voltage (Bank1, Sensor 1):

Heated Oxygen Sensor (HO2S 1) Circuit:

CIRCUIT DESCRIPTION
The Vehicle Control Module-A (VCM-A) supplies a voltage of about 0.45 volt (450 mV) between terminals "BL21" and "BL7". (If measured with a 10 megohm digital voltmeter, this may read as low as 0.32 volt.) The heated oxygen sensor 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 or an open sensor circuit or cold sensor causes "Open Loop" operation. P0132 determines if the Heated Oxygen Sensor (HO2S) or circuit is shorted to high by checking for a rich condition during steady throttle. DTC P0132 is a type "A" DTC.

DTC PO132 WILL SET WHEN
^ No Throttle Position (TP) sensor DTCs.
^ No Evaporative Emissions (EVAP) System DTCs.
^ No Intake Air Temperature (IAT) sensor DTCs.
^ No Manifold Absolute Pressure (MAP) DTCs.
^ No fuel trim DTCs.
^ No Exhaust Gas Recirculation (EGR) DTCs.
^ No Engine Coolant Temperature (ECT) sensor DTCs.
^ "Closed Loop."
^ Air/fuel ratio is between 14.5 and 14.8.
^ Throttle position is between 5% and 50%.
^ Above met for 5 seconds.
^ HO2S voltage is greater than 0.976V

ACTION TAKEN (VCM-A WILL DEFAULT TO)
A current DTC P0132 will cause the system to operate in "Open Loop." With a current DTC P0132 set, the Malfunction Indicator Lamp (MIL) (Service Engine Soon) will be illuminated after 1 test failure.

DTC P0132 WILL CLEAR WHEN
The VCM-A will turn the MIL "OFF" after three consecutive trips without a fault condition present. A history DTC will be cleared if no fault conditions have been detected for forty warm-up cycles [coolant temperature has risen 22°C (40°F) from start-up coolant temperature and engine coolant temperature exceeds 71°C (160°F) that same ignition cycle] or the Tech 1 clearing feature has been used.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Determines if conditions necessary to set DTC PO132 exist.

DIAGNOSTIC AIDS
Check the following items:
^ Fuel pressure - System will go rich if pressure is too high. The VCM-A can compensate for some increase. However, if it gets too high, DTC P0132 may be set. Refer to Chart A-7 Poppet Nozzle Diagnosis. Chart A-7 Poppet Nozzle Diagnosis
^ Rich injector - Perform poppet nozzle test.
^ Leaking injector - Refer to Chart A-6 Fuel System Diagnosis. Related Tests, Information and Procedures
^ Check for fuel contaminated oil.
^ EVAP canister purge - Check for fuel saturation. If full of fuel, check canister control and hoses. Refer to Evaporative Emission Control (EVAP) System.
^ Check for leaking fuel pressure regulator diaphragm by checking vacuum line to regulator for fuel.
^ TP sensor - An intermittent TP sensor output will cause the system to go rich due to a false indication of the throttle moving.
^ False rich indication due to silicon contamination of the heated oxygen sensor. This will be indicated by DTC P0132 accompanied by lean driveability conditions and a powdery white deposit on the sensor.
^ Faulty Heated Oxygen Sensor (HO2S 1) - If HO2S 1 is internally shorted to the HO2S heater circuit, the HO2S 1 voltage displayed on a Tech 1 will be over 1 volt. Try disconnecting the HO2S 1; if the displayed voltage goes from over 1000 mV to around 450 mV, replace HO2S 1.