Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
YES
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO
Go to " Signal Circuit Inspection " procedure.
Check for short to battery in harness
Ignition "OFF".
Disconnect MAF sensor connector.
Ignition "ON" & Engine "OFF" .
Measure voltage between terminal 1 of the sensor harness connector and chassis ground.
Specification : Approx. 5V
Is the measured voltage within specifications?
YES
▶ Go to "Check open in signal harness" as below.
NO
▶ Check for short to battery in signal harness.
Repair as necessary and go to "Verification vehicle Repair" procedure.
Check for open in harness
Ignition "OFF".
Disconnect MAF sensor and ECM connector.
Measure resistance between terminal 1 of the sensor harness connector and terminal 8 of the ECM harness connector.
Specification : Approx. below 1Ω
Is the measured resistance within specifications?
YES
▶ Go to ’Component Inspection" procedure
NO
▶ Check for open in signal harness.
Repair as necessary and go to "Verification vehicle Repair" procedure.
