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
Go to "CAN High line Inspection" procedure
Ignition "OFF"
Disconnect ECM and TCM connectors
Measure resistance between ECM(36/C23-4) and TCM(3/C24-3) harness connectors
Specification : Approx. 0Ω
Is resistance within specifications?
YES
Go to next step.
NO
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Ignition "OFF"
Measure resistance between ECM(36/C23-4) harness connectors and chassis ground
Specification : Infinite
Is resistance within specifications?
YES
Go to next step.
NO
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Ignition "ON" & Engine "OFF"
Measure voltage between ECM(36/C23-4) harness connectors and chassis ground
Specification : Approx. 0V
Is voltage within specifications?
YES
Go to "CAN Low Line Inspection" procedure
NO
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Ignition "OFF"
Disconnect ECM and TCM connectors
Measure resistance between ECM(37/C23-4) and TCM(4/C24-3) harness connectors
Specification : Approx. 0Ω
Is resistance within specifications?
YES
Go to next step.
NO
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Ignition "OFF"
Measure resistance between ECM(37/C23-4) harness connectors and chassis ground
Specification : Infinite
Is resistance within specifications?
YES
Go to next step.
NO
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Ignition "ON" & Engine "OFF"
Measure voltage between ECM(37/C23-4) harness connectors and chassis ground
Specification : Approx. 0V
Is voltage within specification?
YES
Thoroughly check connectors for loose or poor connections, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
NO
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
