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
When ECM detects short circuit for ECTS signal line,it assumes ECTS data as 0V and 139℃.
Turn ignition switch to OFF and disconnect ECTS connector.
Turn ignition switch to ON
Measure resistance between ECTS signal circuit and ground circuit.
Measure resistance between ECTS harness connector and chassis ground at ECTS signal circuit.
Probe(+) : ECTS harness connector NO4.
Probe(-) : ECTS harness connector NO3 and Chassis ground.
Specification: infinite
Is resistance within Specification?
YES
Go to "Component Inspection".
NO
Short circuit between ECTS signal circuit and ground circuit
Short chassis ground between ECTS harness connector and ECM harness connector
Repair as necessary and go to "Verification of Vehicle Repair"
