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
With ignition switch to ON
Measure voltage between chassis ground and generator + B.
Probe(+) : Generator + B.
Probe(-) : Chassis ground.
Specification: Approximately 12 ~ 15V
Is the voltage within specification?
YES
Temporarily install a known good ECM and check for proper opera
If problem is corrected, replace ECM
NO
Over charging or bad connection of generator
Repair as necessary and go to "Verification of Vehicle Repair"
