4.
Measure voltage between terminal 3 of the MAF sensor heater harness connector and chassis ground.
Specification : B+
Many malfunctions in the electrical system are caused by poor harness(es) 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 Supply Circuit Inspection" procedure.
Ignition "OFF".
Disconnect MAF connector.
Ignition "ON" & Engine "OFF".
Measure voltage between terminal 3 of the MAF sensor heater harness connector and chassis ground.
Specification : B+
Is voltage within the specification?
YES
▶ Go to "Signal Circuit Inspection" procedure.
NO
▶ Check for an open or short to ground in the power supply circuit between the MAF sensor and main relay.
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for open in signal harness.
Ignition "OFF".
Disconnect ECM connector.
Measure resistance between terminals 2 of the MAF sensor harness connector and 1 of the ECM harness connector.
Specification : Approx. 0Ω
Is resistance within the specification?
YES
▶ Go to next step as below.
NO
▶ Check for an open in signal harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short to ground in signal harness.
Ignition "OFF".
Measure resistance between terminal 2 of the MAF sensor harness connector and chassis ground.
Specification : infinite
Is resistance within the specification?
YES
▶ Go to "Component Inspection" procedure.
NO
▶ Repair open or short in harness and go to "Verification of Vehicle Repair" procedure.
