Air Flow Meter/Sensor: Testing and Inspection

Mass Air Flow (MAF) & Intake Air Temperature (IAT) Sensor On-Vehicle Inspection

NOTE:

Before performed this inspection, be sure to read the Precautions for ECM Circuit Inspection Precautions for ECM Circuit Inspection.

1) Disconnect MAF & IAT sensor connector.
2) Check that voltage of MAF & IAT sensor connector (harness side) between terminals "3" and "4" is battery voltage when ignition switch is in ON position.

If faulty condition is found, check power supply circuit, ground circuit and connections.





3) Check that MAF sensor signal and IAT sensor signal are output properly. Pinout Values and Diagnostic Parameters

If faulty condition is found, check the following.
- Wire harness and connections.
- MAF & IAT sensor Inspection