DTC Troubleshooting

DTC Troubleshooting: P0108

DTC P0108: MAP Sensor Circuit High Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Reading and Clearing Diagnostic Trouble Codes

1. Turn the ignition switch to ON (II).

2. Check the MAP SENSOR in the DATA LIST with the HDS.

Is 160 kPa (47.1 in.Hg, 1,197 mmHg), or 4.49 V or more indicated?
YES - Go to step 3.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM.


3. Turn the ignition switch to LOCK (0).

4. Disconnect the MAP sensor 3P connector.

5. Connect MAP sensor 3P connector terminals No. 2 and No. 3 with a jumper wire.

6. Turn the ignition switch to ON (II).

7. Check the MAP SENSOR in the DATA LIST with the HDS.

Is 160 kPa (47.1 in.Hg, 1,197 mmHg), or 4.49 V or more indicated?
YES - Go to step 8.

NO - Go to step 19.






8. Remove the jumper wire from the MAP sensor 3P connector.

9. Measure the voltage between MAP sensor 3P connector terminals No. 1 and No. 3.

Is there about 5 V?
YES - Go to step 15.

NO - Go to step 10.






10. Turn the ignition switch to LOCK (0).

11. Jump the SCS line with the HDS.

12. Disconnect PCM connector C (22P).

13. Connect MAP sensor 3P connector terminal No. 3 to body ground with a jumper wire.






14. Check for continuity between PCM connector terminal C4 and body ground.

Is there continuity?
YES - Go to step 26.

NO - Repair open in the wire between the PCM (C4) and the MAP sensor, then go to step 21.






15. Turn the ignition switch to LOCK (0).

16. Connect PCM connector terminals C4 and C5 with a jumper wire.

17. Turn the ignition switch to ON (II).

18. Check the MAP SENSOR in the DATA LIST with the HDS.

Is 160 kPa (47.1 in.Hg, 1,197 mmHg), or 4.49 V or more indicated?
YES - Go to step 26.

NO - Repair open in the wire between the PCM (C5) and the MAP sensor, then go to step 21.






19. Turn the ignition switch to LOCK (0).

20. Replace the MAP sensor. Service and Repair

21. Reconnect all connectors.

22. Turn the ignition switch to ON (II).

23. Reset the PCM with the HDS.

24. Do the PCM idle learn procedure. PCM Idle Learn Procedure

25. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P0108 indicated?
YES - Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1.

NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.


26. Reconnect all connectors.

27. Update the PCM if it does not have the latest software, PCM Update or substitute a known-good PCM. Reading and Clearing Diagnostic Trouble Codes

28. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P0108 indicated?
YES - Check for poor connections or loose terminals at the MAP sensor and the PCM. If the PCM was updated, substitute a known-good PCM, Reading and Clearing Diagnostic Trouble Codes then recheck. If the PCM was substituted, go to step 1.

NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. Service and Repair If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.