3.
Measure the voltage between terminal 21 of the main relay harness connector and chassis ground.
Specification : Approx. 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.
Remove the main relay.
Ignition "ON" ＆ Engine "OFF".
Measure the voltage between terminal 21 of the main relay harness connector and chassis ground.
Specification : Approx. B+
Is voltage within the specification?
YES
▶ Go to "Control Circuit Inspection".
NO
▶ Check for an open or short to ground in the power circuit. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short to ground in control circuit.
Ignition "OFF".
Disconnect Relay harness connector.
Measure resistance between terminal 22 of the relay harness connector and chassis ground
Specification : Infinite
Is resistance within the specification?
YES
▶ Go to next step as below.
NO
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short to power in control circuit.
Ignition "OFF".
Disconnect relay and ECM connectors.
Ignition "ON" and Engine "OFF".
Measure voltage between terminal 22 of the relay harness connector and chassis ground
Specification : Approx 0V
Is voltage within the specification?
YES
▶ Go to next step as below.
NO
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for open in control harness.
Ignition "OFF".
Disconnect relay and ECM connectors.
Measure resistance between terminals 22 of the relay harness connector and 23 of the ECM harness connector
Specification : Approx 0Ω
Is resistance within the specification?
YES
▶ Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
