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DTC P0101: MAF Sensor Circuit Range/Performance Problem

NOTE:
  • Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see 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 duct
    • Air cleaner
    • Purge (PCS) line
    • Brake booster
    • 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 incorrectly installed air intake duct in the air cleaner.

    Is it OK? 

    YES  -Go to step 3.

    NO  -Reconnect or replace the air duct in the air cleaner, then Go to step  13.

  3. Check for a dirty air cleaner element.

    Is it dirty? 

    YES  -Replace the air cleaner element (see AIR CLEANER ELEMENT INSPECTION/REPLACEMENT ), then Go to step  14.

    NO  -Go to step 4.

  4. Turn the ignition switch to 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 is 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 P or N) 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
    • VEHICLE SPEED SENSOR
    • MAP SENSOR
    • MAF SENSOR
  11. Monitor the OBD STATUS for DTC P0101 in the DTCs MENU with the HDS.

    Does the HDS Indicate FAILED? 

    YES  -Go to step 12.

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

  12. Turn the ignition switch to LOCK (0).
  13. Replace the MAF sensor/IAT sensor (see MAF SENSOR/IAT SENSOR REPLACEMENT ).
  14. Turn the ignition switch to ON (II).
  15. Reset the PCM with the HDS.
  16. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  17. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VECHICLE SPEED SENSOR
    • MAP SENSOR
    • MAF SENSOR
  18. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0101 indicated? 

    YES  -Check for poor connections or loose terminals at the MAF sensor and the 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 HDS indicate PASSED? 

    YES  -Troubleshooting is complete. If any other Pending DTCs or Confirmed DTCs were indicated in step 18, Go to the indicated DTC's troubleshooting. ■

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

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