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), or press the engine start/stop button to select the ON mode, and wait 2 seconds.

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

Is about 202 g/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/IAT sensor and the PCM.

3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

4. Jump the SCS line with the HDS.

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

6. Disconnect PCM connector A (49P).

7. Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 4 and PCM connector terminal A9.





Is there continuity?

YES -

Go to step 8.

NO -

Repair an open in the wire between the PCM (A9) and the MAF sensor/IAT sensor, then go to step 15.

8. Reconnect PCM connector A (49P).

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






10. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

11. Clear the DTC with the HDS.

12. Check for Pending or Confirmed 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), or press the engine start/stop button to select the OFF mode.

14. Replace the MAF sensor/IAT sensor Service and Repair.

15. Reconnect all connectors.

16. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

17. Reset the PCM with the HDS.

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

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

Is DTC P0103 indicated?

YES -

Check for poor connections or loose terminals at the MAF sensor/IAT 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.

20. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

21. Reconnect all connectors.

22. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM.

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

Is DTC P0103 indicated?

YES -

Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM, 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.