1C
Mass Air Flow (MAF) and Intake Air Temperature (IAT) Sensor On-Vehicle Inspection (With VVT)
1) Disconnect MAF and IAT sensor connector.
2) Connect voltmeter to “BLU/BLK” wire terminal (2) of MAF and IAT sensor coupler (1) disconnected and ground.
3) Turn ignition switch ON and check that voltage is battery voltage.
If not, check if wire harness is open or connection is poor.
4) Turn ignition switch OFF and connect coupler to MAF and IAT sensor.
5) Turn ignition switch ON and check MAF signal voltage between “E119-14” terminal and “E119-32” terminal of ECM coupler.
MAF signal voltage of MAF and IAT sensor at ignition switch ON
0.5 – 1.0 V
1. ECM
6) Start engine and check that voltage is lower than 5 V and it rises as engine speed increases.
MAF signal reference voltage of MAF and IAT sensor at specified idle speed
1.3 – 1.8 V
7) If check result is not as specified above, cause may lie in wire harness, coupler connection, MAF and IAT sensor or ECM.