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DTC P0107: Map Sensor Low: Testing

  1. Start the engine. With the DRBIII® scan tool, read the MAP sensor voltage. Is the voltage below 0.078 of a volt? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the MAP sensor harness connector. Turn the ignition on, engine not running. Measure the voltage of the (K6) 5-volt supply circuit in the MAP sensor harness connector. Is the voltage between 4.5 and 5.2 volts. If yes, go to next step. If no, go to step  7.
  3. Turn the ignition off. Disconnect the MAP sensor harness connector. Ignition on, engine not running. With the DRBIII® scan tool, monitor the MAP sensor voltage. Is the voltage above 1.2 volts? If yes, replace the MAP sensor. If no, go to next step.
  4. Turn the ignition off. Disconnect the MAP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K1) MAP signal circuit at the MAP sensor harness connector. Is the resistance below 100 ohms? If yes, repair the (K1) MAP sensor signal circuit for a short to ground. If no, go to next step.
  5. Turn the ignition off. Disconnect the MAP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between the (K1) MAP signal circuit and the (K4) MAP sensor ground circuit in the (K1) MAP sensor harness connector. Is the resistance below 100 ohms? If yes, repair the (K1) MAP sensor signal circuit for a short to the (K4) MAP sensor ground circuit. If no, go to next step.
    6. NOTE: Before continuing, disconnect the PCM harness connectors and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
  6. Using the wiring diagram as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
  7. Turn the ignition off. Ensure the MAP sensor is disconnected. Disconnect the PCM harness connectors. Measure the resistance of the (K6) 5-volt supply circuit in the MAP sensor harness connector to ground. Is the resistance below 100 ohms? If yes, repair the (K6) 5-volt supply circuit for a short to ground. If no, go to next step.
    8. 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.
  8. Turn the ignition off. Disconnect the MAP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K6) 5-volt supply circuit between the MAP sensor harness connector and the PCM harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the (K6) 5-volt supply circuit for an open.
    9. NOTE: Before continuing, disconnect the PCM harness connectors and check the related wiring 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 .
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