P0101

DTC P0101: MAF sensor Range/Performance Problem (2003-2004 SULEV, LX-P models and 2005 model)

NOTE: 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. Note this freeze data:
- Engine speed
- Vehicle speed
- MAP sensor
- MAF sensor

2. 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 3.

NO - Repair or replace the damaged parts, then go to step 18.

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

Is it OK?

YES - Go to step 4.

NO - Reconnect or replace the air tube in the air cleaner, then go to step 16.

4. Check for a dirty air cleaner.

Is it dirty?

YES - Replace the air cleaner element, then go to step 16.

NO - Go to step 5.

5. Turn the ignition switch OFF.
6. Turn the ignition switch ON (II).
7. 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 8.

NO - Go to step 14.

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

Does the reading change?

YES - Go to step 11.

NO - Go to step 14.

11. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
12. Test-drive the vehicle for several minutes in the range of the recorded freeze data.
13. Monitor the OBD STATUS for DTC P0101 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES - Go to step 14.

NO - If the screen indicates PASSED, intermittent failure, 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 12 and recheck.

14. Turn the ignition switch OFF.
15. Replace the MAF/IAT sensor.
16. Turn the ignition switch ON (II).
17. Reset the ECM/PCM with the HDS.
18. Do the ECM/PCM idle learn procedure. Programming and Relearning
19. Test-drive the vehicle for several minutes in the range of the recorded freeze data.
20. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P0101 is indicated, check for poor connections or loose terminals at the MAF sensor and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - Go to step 21.

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

Does the screen indicate PASSED?

YES - Troubleshooting is complete.

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 19 and recheck.