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Home >> Chrysler >> 2003 >> PT Cruiser Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0032: O2 Sensor 1/1 Heater Circuit High & P0038: O2 Sensor 1/2 Heater Circuit High >> Testing
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DTC P0032: O2 Sensor 1/1 Heater Circuit High & P0038: O2 Sensor 1/2 Heater Circuit High: Testing

  1. Ignition on, engine not running. With the DRBIII® scan tool, read DTCs and record the related freeze frame data. Is the Good Trip Counter displayed and equal to zero? If yes, go to step  3. If no, go to next step.
  2. Turn the ignition off. Allow the O2 sensor to cool down before continuing the test. The O2 sensor voltage should stabilize at 5.0 volts. Ignition on, engine not running. With the DRBIII® scan tool, actuate the O2 heater test. With the DRBIII® scan tool, monitor O2 sensor voltage for at least 2 minutes. Does the O2 sensor voltage stay above 4.5 volts? If yes, go to next step. If no, seeINTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  3. Turn the ignition off. 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. Heater resistance specification, 3.0-4.0 ohms (1/1 and 1/2) or 4.0-5.0 ohms (1/2 and 2/2). Is the O2 sensor heater element within specification? If yes, go to next step. If no, replace the O2 sensor.
  4. Turn the ignition off. Disconnect the O2 sensor harness connector. Ignition on, engine not running. With the DRBIII® scan tool, 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? If yes, go to next step. If no, go to step  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? If yes, replace the O2 sensor. If no, repair the open in the O2 heater ground circuit.
  6. Turn the ignition off. Disconnect the O2 sensor harness connector. Disconnect the PCM harness connectors. 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? If yes, repair the short to voltage in the O2 heater control circuit. If no, go to next step.
    7. 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.
    NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  7. Turn the ignition off. Disconnect the O2 sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the O2 heater control circuit from the O2 sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, replace and program the PCM. See PROGRAMMING . If no, repair the open in the O2 heater control circuit.
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