DTC Troubleshooting

DTC Troubleshooting: P0103

DTC P0103: MAF Sensor Circuit High Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Initial Inspection and Diagnostic Overview

1. Turn the ignition switch to ON (II), and wait 2 seconds.

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

Is about 202 gm/s, or 4.89 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 MAF sensor and the PCM.


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

4. Jump the SCS line with the HDS.

5. Disconnect the MAF sensor/IAT sensor 1 5P connector.

6. Disconnect PCM connector B (44P).

7. Check for continuity between MAF sensor/IAT sensor 1 5P connector terminal No. 4 and PCM connector terminal B32.

Is there continuity?
YES - Go to step 8.

NO - Repair open in the wire between the PCM (B32) and the MAF sensor, then go to step 15.






8. Reconnect PCM connector B (44P).

9. Connect MAF sensor/IAT sensor 1 5P connector terminals No. 3 and No. 4 with a jumper wire.






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

11. Clear the DTC with the HDS.

12. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0103 indicated?
YES - Go to step 20.

NO - Go to step 13.


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

14. Replace the MAF sensor/IAT sensor 1. MAF Sensor/IAT Sensor 1 Replacement

15. Reconnect all connectors.

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

17. Reset the PCM with the HDS.

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

19. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0103 indicated?
YES - Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1 and the PCM, then go to step 1.

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


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

21. Reconnect all connectors.

22. Update the PCM if it does not have the latest software, PCM Update or substitute a known-good PCM. Initial Inspection and Diagnostic Overview

23. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0103 indicated?
YES - Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1 and the PCM. If the PCM was updated, substitute a known-good PCM, Initial Inspection and Diagnostic Overview 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 Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.