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Home › Chrysler › 2002 › Intrepid Base › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0070: Ambient Temp Sensor Stuck Or DTC P0071: Ambient Temp Sensor Performance › Testing

DTC P0070: Ambient Temp Sensor Stuck Or DTC P0071: Ambient Temp Sensor Performance: Testing

  1. Turn ignition on, engine not running. With the DRBIII®, read DTCs and record the related Freeze Frame data. Is the Good Trip counter equal to zero? If yes, go to next step. If no, go to step  9.
  2. Turn the ignition off. Disconnect the Ambient Temperature Sensor harness connector. Turn ignition on, engine not running. Measure the voltage of the Ambient Temperature Sensor Signal circuit in the Ambient Temperature Sensor harness connector. Is the voltage above 5.2 volts? If yes, repair the short to battery voltage in the Ambient temperature Sensor Signal circuit. If no, go to next step.
  3. With the DRBIII®, read the Ambient Temperature Sensor voltage. Is the voltage below 4.6 volts? If yes, go to next step. If no, go to next step.
  4. Turn the ignition off. Using a jumper wire, jumper across the Ambient Temperature Sensor harness connector. Turn ignition on, engine not running. With the DRBIII®, read the Ambient Temperature Sensor voltage. Is the voltage below 1.0 volt? If yes, replace the Ambient Temperature Sensor. If no, go to next step.
    5. 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.
  5. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the Ambient Temperature Sensor Signal circuit from the Ambient Temperature 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 Ambient Temperature Sensor Signal circuit.
  6. Measure the resistance of the Sensor Ground circuit from the Ambient Temperature Sensor harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance below 5.0 ohms? If yes, replace PCM. Program the new PCM. See PROGRAMMING . If no, repair the open in the Sensor Ground circuit.
  7. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance between ground and the Ambient Temperature Sensor Signal circuit. Is the resistance below 100 ohms? If yes, repair the short to ground in the Ambient Temperature Sensor Signal circuit. If no, go to next step.
  8. Measure the resistance between the Ambient Temperature Sensor Signal circuit and the Sensor Ground circuit in the Ambient Temperature Sensor harness connector. Is the resistance below 100 ohms? If yes, repair the short to the Sensor Ground circuit in the Ambient Temperature Sensor Signal circuit. If no, replace PCM. Program the new PCM. See PROGRAMMING .
    9. 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.
  9. 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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