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DTC P0108: Map Sensor Circuit High Input

  1. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Select MAP sensor parameter. If display reads 130 kPa or greater, go to next step. If display reading is less than 130 kPa, check for an intermittent problem. See TESTS W/O CODES article.
  2. Turn ignition off. Disconnect MAP sensor harness connector. Turn ignition on. Measure voltage between ground and Green wire at MAP sensor harness connector. If reading is 4-6 volts, go to next step. If reading is not 4-6 volts, check Green wire for an open or for a poor connection at PCM harness connector "B". If wiring and connections are okay, replace PCM and retest system.
  3. With ignition on, measure voltage between ground and Pink/Green wire at MAP sensor harness connector. If reading is 4-6 volts, go to next step. If reading is not 4-6 volts, check Pink/Green wire for a short to power or for a poor connection at PCM harness connector "B". If wiring and connections are okay, replace PCM and retest system.
  4. Turn ignition off. Disconnect vacuum hose from MAP sensor. Remove MAP sensor. Connect three 1.5 volt batteries in series. Connect positive terminal of batteries to "Voltage in" terminal at MAP sensor. Connect negative terminal of batteries to "Ground" terminal at MAP sensor. See Figure .
  5. Measure voltage between "Voltage out" terminal and "Ground" terminal at MAP sensor. Ensure voltage is as specified. See MAP SENSOR OUTPUT VOLTAGE  table. Ensure voltage decreases as vacuum (up to 15 in. Hg) is supplied to MAP sensor. Replace MAP sensor if voltage is not as specified. If MAP sensor voltage is as specified, go to next step.
  6. Check Pink/Green wire for being shorted to Green wire and check Green/Red wire for an open. Repair as necessary. If wiring is okay, check for poor connection at PCM. If PCM connection is okay, replace PCM. Retest system.
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