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 CKPS connector.
Measure voltage of CKPS signal circuit between CKPS harness connector and chassis ground.
Probe(+) : CKPS harness connector NO1.
Probe(-) : Chassis ground.
Specification: Approximately 2.5V
Is voltage within Specification?
YES
Go to "OPEN CIRCUIT INSPECTION OF GROUND LINE"
NO
Open circuit or short circuit to chassis ground between CKPS harness connector and ECM harness connector
Repair as necessary and go to "Verification of Vehicle Repair" procedure
1.In case,when CKPS connector is disconnected,the voltage at terminal 1 is 0V.
▶Possible cause : Open circuit in signal line or faulty ECM
After disconnecting CKPS,measurement of resistence at terminal 2 is for finding open ground circuit.
Turn ignition switch to OFF and disconnect CKPS connector.
Measure voltage of CKPS ground circuit between CKPS harness connector and chassis ground.
Probe(+) : CKPS harness connector NO2.
Probe(-) : Chassis ground.
Specification: Approximately 2.5V
Is voltage within Specification?
YES
Go to "SHORT CIRCUIT INSPECTION OF SIGNAL LINE"
NO
Open circuit or short circuit to chassis ground between CKPS harness connector and ECM harness connector
Repair as necessary and go to "Verification of Vehicle Repair" procedure
1.In case,when CKPS connector is disconnected,the voltage at terminal 2 is 0V.
▶Possible cause : Open circuit in ground line or faulty ECM
Short circuit inspection of CKPS signal line is usually done when the voltage at terminal 1.2 is 0V.
Turn ignition switch to OFF and disconnect CKPS connector and ECM connector.
Measure resistance of CKPS signal circuit between CKPS ground circuit and ECM harnece connector and Chassis ground.
Probe(+) : CKPS signal circuit harness connector NO1 and NO2..
Probe(-) : Chassis ground.
Specification: Infinite
Dose resistance indicate open circuit?
YES
Go to "ECM INSPECTION"
NO
Short circuit to chassis ground between CKPS harness connector and ECM harness connector
Short circuit between CKPS signal circuit and ground circuit
Repair as necessary and go to "Verification of Vehicle Repair" procedure
