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 ISCA connector.
With ignition switch to ON
Measure voltage of ISCA close signal circuit between ISCA harness connector and chassis ground.
Probe(+) : ISCA harness connector NO1.
Probe(-) : Chassis ground.
Specification: Approximately 3.6V
Is voltage within Specification?
YES
Thoroughly check for loose,bent or corroded terminals at all connectors in circuit
NO
Short circuit to battery between ISCA close signal circuit and ECM
Repair as necessary and go to "Verification of Vehicle Repair"
1.In case,when the ISCA connector is disconnected,the voltage of ISCA terminal 2 is 12 V.
▶Possible cause: Short circuit in battery power line after fuse (15A INJ).
