4.
Measure voltage between terminal 5 of the Fuel Pump Relay harness connector and chassis ground.
Specification : B+
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.
Ignition "OFF".
Disconnect Fuel Pump Relay.
Ignition "ON" & Engine "OFF".
Measure voltage between terminal 5 of the Fuel Pump Relay harness connector and chassis ground.
Specification : B+
Is the measured voltage within specifications ?
YES
▶ Go to "Control Circuit Inspection" procedure.
NO
▶ Check for open in power harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short to ground in harness
Ignition "OFF".
Disconnect Fuel Pump Relay and ECM connector.
Measure resistance between terminal 3 of the Fuel Pump Relay harness connector and Chassis ground.
Specification : Infinite
Is the measured resistance within specifications ?
YES
▶ Go to "Check for open in control harness" as below.
NO
▶ Check for short to ground in control harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure
Check for open in control harness
Ignition "OFF".
Disconnect Fuel Pump Relay and ECM connector.
Measure resistance between terminal 3 of the Fuel Pump Relay harness connector and terminal 24 of ECM harness connector.
Specification : Approx.below 1Ω
Is the measured resistance within specifications ?
YES
▶ Go to "Component Inspection" procedure.
NO
▶ Check for open in control harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
