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Home >> Chrysler >> 2001 >> Intrepid Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0030: 1/1 O2 Sensor Heater Circuit, DTC P0036: 1/2 O2 Sensor Heater Circuit, DTC P0050: 2/1 O2 Sensor Heater Or DTC P0056: 2/2 O2 Sensor Heater Circuit >> Testing
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DTC P0030: 1/1 O2 Sensor Heater Circuit, DTC P0036: 1/2 O2 Sensor Heater Circuit, DTC P0050: 2/1 O2 Sensor Heater Or DTC P0056: 2/2 O2 Sensor Heater Circuit: Testing

WARNING: This page is about a different car, the 2002 Dodge Intrepid, 2002 Chrysler Intrepid, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn 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? If yes, go to step  3. If no, go to next step.
    2. NOTE: Wait a minimum of 8 minutes to allow the O2 Sensor to cool down before continuing the test.
  2. Turn 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? If yes, go to next step. If no, go to step  10.
  3. Turn the ignition off. Allow the O2 Sensor to cool down to room temperature before continuing. Disconnect the O2 Sensor harness connector related to the DTC that is set. Measure the resistance of the O2 Heater element (component side). Resistance value increases with temperature. O2 Heater resistance should be 3.0 to 4.0 ohms (1/1 and 2/1 O2 Sensors) or 4.0 to 5.0 ohms (1/2 and 2/2 O2 Sensors). Is the resistance as specified? If yes, go to next step. If no, replace the O2 sensor.
  4. Turn 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 Sensor Heater Control circuit in the O2 Sensor harness connector. Does the test light brightly flash on and off? If yes, go to next step. If no, go to step  6.
  5. Turn the ignition off. Measure the resistance between and engine ground and the O2 Sensor 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 Sensor Heater ground circuit.
  6. Ensure the ignition is off. Disconnect the PCM harness connectors. Turn ignition on, engine not running. Measure the voltage on the O2 Sensor Heater Control circuit at the O2 Sensor harness connector. Does the voltmeter indicated any voltage present? If yes, repair the short to voltage in the O2 Sensor 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. Use Miller Special Tool (8815) when performing diagnosis at PCM harness connectors.
  7. Measure the resistance of the O2 Sensor Heater Control circuit from the O2 Sensor harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the O2 Sensor Heater Control circuit.
  8. Measure the resistance between ground and the O2 Sensor Heater Control circuit in the O2 Sensor harness connector. Is the resistance below 5.0 ohms? If yes, repair the short to ground in the O2 Sensor Heater Control circuit. If no, go to next step.
    9. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage or terminal push out. Repair as necessary.
  9. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
    10. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  10. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
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