Many malfunctions in the electrical system are caused by poor harness(s) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Check the following conditions:
Check for damaged harness and terminals: contact resistance, oxidation, bent or broken terminals.
Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection
Use a suitable male pin to ensure that contact in sockets is good. The pin should remain in position when pulled gently.
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 Injector connector
Turn ignition on and measure voltage between 1 of the injector harness connector(C37-4)
Specification : Approx. B+
Is voltage display within specifications?
YES
Go to "Control Circuit Inspection" procedure
NO
Check for a open in the power supply circuit between the main relay and the Injector.
Check for open or blown 10A injector fuse. Refer to "Component Circuit"
Repair as necessary and go to "Verification of Vehicle Repair" procedure
Check for short to ground in control circuit
Ignition "OFF"
Disconnect connectors from injector and ECM
Ignition "ON" & Engine "OFF"
Measure voltage between terminal 2 of the injector harness connector(C37-4) and chassis ground
Specification : Approx. 0V
Is voltage within specification?
YES
Go to next step.
NO
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for open in control circuit
Ignition "OFF"
Measure resistance between terminals 2 of the injector harness connector(C37-4) and ECM(36/C23-3)
Specification : Approx. 0Ω
Is resistance within specification?
YES
Thoroughly check connectors for loose or poor connections, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure
NO
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
