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DTC Diagnosis Procedure
1.CHECK DTC PRIORITY
If DTC P0101 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
Is applicable DTC detected?
Perform diagnosis of applicable. Refer to DTC Index.
.
 
2.CHECK HARNESS CONNECTOR
  1. Disconnect mass air flow (MAF) sensor harness connector and ECM harness connector.
  2. Connect MAF sensor harness connector and ECM harness connector.
  3. Perform DTC Confirmation Procedure. DTC Description
Is 1st trip DTC detected?
.
INSPECTION END
 
3.CHECK INTAKE SYSTEM
Check the following for connection.
  • Air duct
  • Vacuum hoses
  • Intake air passage between air duct and intake manifold
Is the inspection result normal?
.
Reconnect the parts.
 
4.CHECK MASS AIR FLOW (MAF) SENSOR POWER SUPPLY
  1. Turn ignition switch OFF.
  2. Disconnect MAF sensor harness connector.
  3. Turn ignition switch ON.
  4. Check the voltage between MAF sensor harness connector and ground.
    +−Voltage
    MAF sensor
    ConnectorTerminal
    F221Ground5 V
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
5.CHECK MAF SENSOR GROUND CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between MAF sensor harness connector and ECM harness connector.
    +−Continuity
    MAF sensorECM
    ConnectorTerminalConnectorTerminal
    F223F5150Existed
  4. Also check harness for short to power.
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
6.CHECK MAF SENSOR INPUT SIGNAL CIRCUIT
  1. Check the continuity between MAF sensor harness connector and ECM harness connector.
    +−Continuity
    MAF sensorECM
    ConnectorTerminalConnectorTerminal
    F222F5147Existed
  2. Also check harness for short to ground and to power.
Is the inspection result normal?
.
Repair or replace error-detected parts
 
7.CHECK INTAKE AIR TEMPERATURE SENSOR
Check the intake air temperature sensor. Refer to Component Inspection.
Is the inspection result normal?
.
Replace MAF sensor. Refer to Exploded View.
 
8.CHECK PCV VALVE
Check the PCV valve. Refer to POSITIVE CRANKCASE VENTILATION : Periodic Maintenance.
Is the inspection result normal?
.
Replace PCV valve. Refer to Removal and Installation.
 
9.PERFORM IDLE AIR VOLUME LEARNING
Perform the idle air volume learning. Refer to Description.
: .
 
10.PERFORM EVAP LEAK CHECK
Preform the EVAP leak check. Refer to EVAP CANISTER : Periodic Maintenance.
: .
 
11.CHECK MAF SENSOR
Check the MAF sensor. Refer to Component Inspection.
Is the inspection result normal?
Replace EVAP control system pressure sensor. Refer to Removal and Installation.
Replace MAF sensor. Refer to Exploded View.