DTC Troubleshooting

DTC P0101: MAF sensor Circuit Range/Performance Problem ('05-07 models)

NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
- If DTC P1128, P1129, P2228, and/or P2229 are stored at the same time as DTC P0101, troubleshoot those DTCs first, then recheck for DTC P0101.

1. Check for poor connections or damage to these parts:
- PCV hose
- Intake air tube
- Air cleaner
- Purge (PCS) line
- Brake booster hose

Are the parts OK?

YES - Go to step 2.

NO - Repair or replace the damaged parts, then go to step 14.

2. Check for damage or looseness at the air tube in the air cleaner.

Is it OK?

YES - Go to step 3.

NO - Reconnect or replace the air tube in the air cleaner, then go to step 14.

3. Check for a dirty air cleaner.

Is it dirty?

YES - Replace the air cleaner element, then go to step 14.

NO - Go to step 4.

4. Turn the ignition switch ON (II).
5. Check the MAF SENSOR in the DATA LIST with the HDS.

Is there about 0.2 gm/s or 0.5 V?

YES - Go to step 6.

NO - Go to step 12.

6. Start the engine.
7. Vary the engine speed between 2,000 rpm and 3,000 rpm.
8. Check the MAF SENSOR in the DATA LIST with the HDS.

Does the reading change?

YES - Go to step 9.

NO - Go to step 12.

9. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
10. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
- ENGINE SPEED
- VSS
- MAP SENSOR
- MAF SENSOR

11. Monitor the OBD STATUS for DTC P0101 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES - Go to step 12.

NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check the poor connections or loose terminals at the MAF sensor and the ECM/PCM. If the screen indicates NOT COMPLETED, go to step 10 and recheck.

12. Turn the ignition switch OFF.
13. Replace the MAF sensor/IAT sensor.
14. Turn the ignition switch ON (II).
15. Reset the ECM/PCM with the HDS.
16. Do the ECM/PCM idle learn procedure. Programming and Relearning
17. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
- ENGINE SPEED
- VSS
- MAP SENSOR
- MAF SENSOR

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

Is DTC P0101 indicated?

YES - Check for poor connections or loose terminals at the MAF sensor and the ECM/PCM, then go to step 1.

NO - Go to step 19.

19. Monitor the OBD STATUS for DTC P0101 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 18, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the MAF sensor and the ECM/PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 17.