DTC P0101: MAF System Performance
- Check the ''On Board Diagnostic (OBD) System Check''.
Was the ''OBD System Check'' performed?
YES – Go to step 2.
NO – Go to OBD System Check. 
- Check the DTC.
Are there any other (beside DTC P0101) being output?
YES – Go to relevant DTC chart.
NO – Go to step 3.
- Check the MAF with the scan tool.
Is about 8 – 13 g/sec indicated at idling?
YES – Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the MAF sensor and at the ECM.
NO – Go to step 4.
- Check for the following conditions:
- Damaged MAF sensor
- MAF/IAT sensor 5P connector (A)
- Air Cleaner (B)
- MAF/IAT sensor (C)
- Duct (D)
- The duct work at the MAF sensor for leaks
- PCV system vacuum leaks
- Incorrect PCV valve
- Vacuum leaks in EGR valve flange and pipes
- Intake manifold vacuum leaks
Is a problem found?
YES – Repair as necessary.
NO – Go to step 5.
- Start the engine and allow it to idle.
- Turn the ignition switch OFF.
- Disconnect the MAF sensor 5P connector.
- Disconnect ECM connector.
- Check the MAF sensor signal and +5 V circuits for an open or short to ground.
Wire side of female terminals
MAF/IAT sensor 5P connector
JUMPER WIRE
Is a problem found?
YES – Repair the MAF signal or +5 V circuit.
NO – Go to step 10.