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 battery power circuit between CKPS harness connector and chassis ground.
Probe(+) : CKPS harness connector NO3.
Probe(-) : Chassis ground.
Specification:approximately 12V
Is voltage within Specification?
YES
Go to "OPEN CIRCUIT INSPECTION OF SENSOR SIGNAL LINE"
NO
Open circuit or short circuit to chassis ground between CKPS harness connector and battery power circuit
Repair as necessary and go to "Verification of Vehicle Repair" procedure
1.In case,when CKPS connector is disconnected,the voltage at terminal 3 is 0V.
▶Possible cause : Open or short circuit between I/P-J/BOX fuse(15A) and CKPS terminal 3.
After disconnecting CKPS connector,the measurement of CKPS signal voltage is for finding open or short circuit by checking the pull-up voltage from ECM.
Turn ignition switch to OFF and disconnect CKP connector. .
Measure voltege of CKP signal circuit between CKP harnece connector and ECM harness connector.
Probe(+) : CKPS harness connector NO2.
Probe(-) : Chassis ground.
Specification: Approximately 5V
Is voltage within Specification?
YES
Go to "OPEN CIRCUIT INSPECTION OF GROUND LINE"
NO
Open or short circuit between CKPs harnece connector and ECM harness connector
Faulty ECM
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 signal line or faulty ECM
2.In case,when CKPS connector is disconnected,the voltage at terminal 2 is 12V.
▶Possible cause : Short circuit between I/P-J/BOX fuse(15A) and CKP terminal 3.
After disconnecting CKPS,measurement of resistence at terminal 1 is for finding open ground circuit.
Turn ignition switch to OFF and disconnect CKPS connector.
Measure resistance or voltage of CKPS ground circuit between CKPS harnece connector and chassis ground.
Probe(+) : CKPS harness connector NO1.
Probe(-) : Chassis ground.
Specification: below 1Ω,below 0.5V
Is resistance or voltage within Specification?
YES
Go to "SHORT CIRCUIT INSPECTION OF SIGNAL LINE"
NO
Open circuit between CKPS harness connector and Chassis ground
Repair as necessary and go to "Verification of Vehicle Repair" procedure
Short circuit inspection of CKPS signal line is usually done when the voltage at terminal 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 NO2.
Probe(-) : CKPS ground circuit harness connector NO1.
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
