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 " Power Circuit Inspection " procedure.

IG "OFF" and Disconnect MAFS connector.

IG "ON" & ENG "OFF"

Measure voltage between terminal 2 of MAFS harness connector and chassis ground

Specification : B+

Is the measured voltage within specification ?

YES

▶ Go to "Ground Circuit Inspection" proceudure.

NO

▶ Check that fuse between MAFS and Main Relay is open or not installed.

▶ Check open in power circuit between MAFS and Main Relay.

▶ Go to "Verification of Vehicle Repair" procedure.

IG "OFF" and disconnect MAFS connector.

Measure voltage between terminal 1 of MAFS harness connector and chassis ground.

Measure voltage between terminal 1 and 3 of MAFS harness connector.

Specification : Voltage difference between Measurement "A" and "B" is below 200mV.

Is the measured voltage within specification ?

YES

▶ Go to "Signal Circuit Inspection" procedure.

NO

▶ Repair contact resistance or open in harnesss and then go to "Verification of Vehicle Repair" procedure.

IG "OFF" and disconnect MAFS connector.

IG "ON’ & ENG "OFF".

Measure voltage between terminal 1 of MAFS harness connector and chassis ground.

Specification : Approx. 5V

Is the measured voltage within specification ?

YES

▶ Go to "Component Inspection" procedure.

NO

▶ Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.