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
System OK. Go to "Verification of Vehicle Repair" procedure
Turn ignition switch to OFF and disconnect injector harness connector.
Turn ignition switch to ON
Measure voltage of injector signal circuit between injector harness connector and chassis ground.
Probe(+) : Injector harness connector NO2.
Probe(-) : Chassis ground.
Specification: below 0.5V
Is the voltege within Specification?
YES
Go to "Component Inspection"
NO
Short circuit to battery power 12V between injector harness connector and control relay
Repair as necessary and go to "Verification of Vehicle Repair"
1.In case the voltage of terminal 2 is measured 12V when the connector is disconnected.
Suspect area: Short to battery power line after fuse(15A for injector) when IG on.
