DTC P0101: MAF Sensor Circuit Range/Performance Problem

NOTE: 

• Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions SystemsHow to Troubleshoot the CVT System(CVT System) .
• If DTC P2228 and/or P2229 are stored at the same time as DTC P0101, troubleshoot those DTCs first, then recheck for DTC P0101.

DTC (PGM-FI)

• 1. Parts condition check:

  - 1. Check for poor connections or damage to these parts:

  • PCV valve
  • 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 part(s).

• 2. Intake air duct visual check:

  - 1. Check for damage or looseness of the intake air duct from the throttle body to the air cleaner.

  Is it OK?

  YES 

  Go to step 3.

  NO 

  Reconnect or replace the intake air duct from the throttle body to the air cleaner.

• 3. Air cleaner element visual check:

  - 1. Check for a dirty air cleaner element.

  Is it dirty?

  YES 

  Replace the air cleaner element .

  NO 

  Go to step 4.

• 4. MAF sensor signal check (without engine running):

  - 1. Turn the vehicle to the OFF (LOCK) mode.

  - 2. Turn the vehicle to the ON mode.

  - 3. Check the parameter(s) below with the HDS.

  Signal	Threshold		Current conditions
  	Values	Unit	Values	Unit
  MAF SENSOR	About 0.2	g/s

  Do the current condition(s) match the threshold?

  YES 

  Go to step 5.

  NO 

  Replace the MAF sensor/IAT sensor .

• 5. MAF sensor signal check (with engine running):

  - 1. Start the engine.

  - 2. Vary the engine speed between 2, 000 rpm and 3, 000 rpm.

  - 3. Check the MAF SENSOR in the DATA LIST with the HDS.

  Signal	Current conditions
  	Values	Unit
  MAF SENSOR

  Does the reading change?

  YES 

  Go to step 6.

  NO 

  Replace the MAF sensor/IAT sensor .

• 6. MAF sensor check:

  - 1. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

  - 2. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:

  • ENGINE SPEED
  • VEHICLE SPEED
  • MAP SENSOR
  • TP SENSOR

  Freeze Data

  Signal	Current conditions
  	Values	Unit
  ENGINE SPEED
  VEHICLE SPEED
  MAP SENSOR
  TP SENSOR

  - 3. Monitor the OBD STATUS for DTC P0101 with the HDS.

  DTC Description	OBD STATUS
  P0101 MAF Sensor Circuit Range/Performance Problem

  Does the HDS indicate FAILED?

  YES 

  Replace the MAF sensor/IAT sensor .

  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/IAT sensor and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot. If the HDS indicates NOT COMPLETED, go to step 6-2 and recheck.