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DTC P0108: Map Sensor Volts Too High: Testing

  1. Start the engine. With the DRBIII®, read the MAP Sensor voltage. Is the voltage above 4.6 volts? If yes, go to next step. If no, go to step  8.
  2. Turn the ignition off. Disconnect the MAP Sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between the MAP Sensor Signal circuit and the 5-Volt Supply circuit in the MAP Sensor harness connector. Is the resistance below 100 ohms? If yes, repair the MAP Sensor Signal circuit for a short to the 5-Volt Supply circuit. If no, go to next step.
  3. Turn the ignition off. Reconnect the PCM connectors. Ensure MAP Sensor is disconnected. Turn the ignition on. Measure the voltage of the MAP Sensor Signal circuit in the MAP Sensor harness connector. Is the voltage above 5.2 volts? If yes, repair the MAP Sensor Signal circuit for a short to battery voltage. If no, go to next step.
  4. Turn the ignition off. Connect a jumper wire between the MAP Sensor Signal circuit and the MAP Sensor ground circuit in the MAP Sensor harness connector. With the DRBIII®, monitor the MAP Sensor voltage. Turn the ignition on. Is the voltage below 1.0 volts? If yes, replace the MAP Sensor. If no, go to next step.
  5. Turn the ignition off. Disconnect the PCM harness connector. Measure the resistance of the MAP Sensor Signal circuit between the MAP Sensor harness connector and the PCM C1 harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the MAP Sensor Signal circuit for an open.
  6. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the Sensor ground circuit between the MAP Sensor harness connector and the PCM C2 harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the Sensor ground circuit for an open.
  7. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
    8. 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.
  8. 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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