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 voltage
Ignition "OFF"
Disconnect MAF sensor connector.
Ignition "ON" & Engine "OFF"
Measure voltage between terminal 1 of MAFS harness connector and chassis ground.
Specification : Below 1V
Is the measured voltage within specifications?
YES
▶ Go to " Component Inspection ’ procedure.
NO
▶ Go to " Check for short to battery in harness" as below.
Check for short to battery in harness
Ignition "OFF"
Disconnect MAFS connector.
Measure resistance between terminal 1 and 2 of MAFS sensor harness connector.
Measure resistance between terminal 1 and 4 of MAFS sensor harness connector.
Specification : Infinite
Is the measured resistance within specifications?
YES
▶ Go to " Ground Circuit Inspection " procedure.
NO
▶ Check short to battery in signal harness.
▶ Repair or replace as necessary and then, go to " Verification of Vehicle Repair" procedure.
Check for open in harness
Ignition "OFF"
Disconnect MAFS and PCM connector.
Measure resistance between terminal 3 of MAFS harness connector and chassis ground.
Specification : Approx. below 1Ω
Is the measured resistance within specifications?
YES
▶ Go to " Component Inspection ’ procedure.
NO
▶ Check open in harenss between MAFS connector and PCM connector.
▶ Repair or replace as necessary and then, go to " Verification of Vehicle Repair" procedure.
