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

NOTE: Before performed this inspection, be sure to read the PRECAUTIONS OF ECM CIRCUIT INSPECTION .

Turn off ignition switch and disconnect MAF & IAT sensor connector.
Check that voltage of MAF & IAT sensor connector (vehicle side) between terminals "1" and "2" is battery voltage when ignition switch is ON.
If faulty condition is found, check power supply circuit, ground circuit and connections.

Fig 1: Identifying MAF And IAT Sensor Connector Terminals 1 And 2
Courtesy of SUZUKI OF AMERICA CORP.
Check that MAF sensor signal is outputted properly. See INSPECTION OF ECM AND ITS CIRCUITS .
If faulty condition is found, check the following.
- Wire harness and connections
- MAF sensor. See MASS AIR FLOW (MAF) & INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION .