Possible Causes

O2 SENSOR HEATER OPERATION

O2 HEATER ELEMENT

O2 HEATER GROUND CIRCUIT OPEN

O2 SENSOR

O2 HEATER CONTROL SHORTED TO VOLTAGE

O2 HEATER CONTROL CIRCUIT OPEN

PCM

DIAGNOSTIC PROCEDURE - P0032-O2 SENSOR 1/1 HEATER CIRCUIT HIGH

TEST	ACTION
1	Ignition on, engine not running. With the DRBIII®, read DTCs and record the related Freeze Frame data. Is the Good Trip Counter displayed and equal to zero? Yes --> Go To 3 No --> Go To 2
2	Turn the ignition off. NOTE: Allow the O2 Sensor to cool down before continuing the test. The O2 Sensor voltage should stabilize at 5.0 volts. Raising the hood may help in reducing under hood temps quicker. Ignition on, engine not running. With the DRBIII®, actuate the O2 Heater Test. With the DRBIII®, monitor O2 Sensor voltage for at least 2 minutes. Does the O2 Sensor voltage stay above 4.5 volts? Yes --> Go To 3 No --> Refer to the INTERMITTENT CONDITION symptom in the Driveability category. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
3	Turn the ignition off. NOTE: Allow the O2 sensor to cool down to room temperature. Disconnect the O2 Sensor harness connector. Measure the resistance across the O2 Sensor Heater element component side. NOTE: Heater Resistance Specification: 1/1 and 2/1 = 3.0 to 4.0 ohms or 1/2 and 2/2 = 4.0 to 5.0 ohms. Is the O2 Sensor Heater element within specification? Yes --> Go To 4 No --> Replace the O2 Sensor. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
4	Turn the ignition off. Disconnect the O2 Sensor harness connector. Ignition on, engine not running. With the DRBIII®, actuate the O2 Heater Test. Using a 12-volt test light connected to ground, probe the O2 Heater Control circuit in the O2 Sensor harness connector. Does the test illuminate brightly and flash on and off? Yes --> Go To 5 No --> Go To 6
5	Turn the ignition off. Disconnect the O2 Sensor harness connector. Measure the resistance between engine ground and the O2 Heater ground circuit in the O2 Sensor harness connector. Is the resistance below 5.0 ohms? Yes --> Replace the O2 Sensor. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC . No --> Repair the open in the O2 Heater ground circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
6	Turn the ignition off. Disconnect the O2 Sensor harness connector. Disconnect the PCM harness connector. Ignition on, engine not running. Measure the voltage on the O2 Heater Control circuit at the O2 Sensor harness connector. Does the voltmeter indicate any voltage present? Yes --> Repair the short to voltage in the O2 Heater Control circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC . No --> Go To 7
7	Turn the ignition off. Disconnect the O2 Sensor harness connector. Disconnect the PCM harness connector. CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS. Measure the resistance of the O2 Heater Control circuit from the O2 Sensor harness connector to the appropriate terminal of special tool #8815 Is the resistance below 5.0 ohms? Yes --> NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Replace and program the Powertrain Control Module in accordance with the Service Information. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC . No --> Repair the open in the O2 Heater Control circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .