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Home >> Dodge and Ram >> 2002 >> Durango Base, 5.9 Z, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - NGC >> Diagnostic Tests >> DTC P0108: Map Sensor Circuit High >> Testing

DTC P0108: Map Sensor Circuit High: Testing

  1. Start the engine. Allow the engine to idle. With the DRBIII(R), read the MAP Sensor voltage. Is the voltage more than 4.6 volts? If yes, go to next step. If no, see INTERMITTENT FAILURES  under ON-BOARD DIAGNOSTICS.
  2. Turn the ignition off. Disconnect the MAP Sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between the MAP Signal circuit and the 5-volt Supply circuit in the MAP Sensor harness connector. Is the resistance less than 100 ohms? If yes, repair the short between the 5-volt Supply circuit and the MAP Signal circuit. If no, go to next step.
  3. Reconnect the PCM harness connectors. Turn the ignition on, with the engine off. Measure the voltage on the MAP Signal circuit in the MAP Sensor harness connector. Is the voltage more than 5.2 volts? If yes, repair the short to battery voltage in the MAP Signal circuit. If no, go to next step.
  4. Turn the ignition off. Connect a jumper wire between the MAP Signal circuit and the Sensor Ground circuit in the MAP Sensor harness connector. With the DRBIII(R), monitor the MAP Sensor voltage. Turn the ignition on, with the engine off. Is the voltage less than one volt? If yes, replace the MAP 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 MAP Signal circuit from the MAP Sensor harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the open in the MAP Signal circuit.
    6. 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.
  6. Measure the resistance of the Sensor Ground circuit from the MAP Sensor harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the open in the Sensor Ground circuit.
    7. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push-out. Repair as necessary.
  7. There are no possible causes remaining, replace the PCM.
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