DTC Troubleshooting: P0101
DTC P0101: MAF Sensor Circuit Range/Performance Problem
NOTE:
Before you troubleshoot, review the general troubleshooting information.
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 Description
Confirmed DTC
Pending DTC
P0101 MAF Sensor Circuit Range/Performance Problem
    

1.
Parts condition check:

Parts condition check
?1.
Check for poor connections or damage to these parts:
PCV valve
PCV hose
Air cleaner
Intake air duct
Purge (PCS) line
Brake booster
Brake booster hose
All parts through the turbocharger to the throttle body

Are the parts OK?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Repair or replace the damaged part(s).?
2.
Intake air duct visual check:

Intake air duct visual check
?1.
Check for damage or looseness of the intake air duct in the air cleaner.

Is it OK?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Reconnect or replace the intake air duct in the air cleaner.?
3.
Air cleaner element visual check:

Air cleaner element visual check
?1.
Check for a dirty air cleaner element.

Is it dirty?

     
YES
     
     
     
     
NO
     
     
     
Go to step 4.
4.
MAF sensor signal check (without engine running):

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

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
     
     
     
6.
Problem verification:

Problem verification
?1.
Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.

?2.
Test-drive the vehicle for several minutes in the range of these recorded on-board snapshot parameters:
ENGINE SPEED
VEHICLE SPEED
MAP SENSOR
TP SENSOR
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
     
     
     
     
NO
     
     
     
If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at MAF sensor/IAT sensor 1 and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot. If the HDS indicates NOT COMPLETED, go to step 6-2 and recheck.?