Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
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.
Check for Open in harness
Ignition "OFF".
Disconnect ECM and TCM connectors.
Measure resistance between terminals 36 of the ECM harness connector and 3 of the TCM harness connector.
Specification : Approx. 0Ω
Is resistance within the specification?
YES
▶ Go to next step as below.
NO
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short to ground in harness.
Measure resistance between terminal 36 of the ECM harness connector and chassis ground.
Specification : Infinite
Is resistance within the specification?
YES
▶ Go to next step as below
NO
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short to battery in harness.
Reconnect the ECM connector.
Ignition "ON" & Engine "OFF".
Measure voltage between terminal 36 of the ECM harness connector and chassis ground.
Specification : Approx. 0V
Is voltage within the specification?
YES
▶ Go to "CAN Low Line Inspection" procedure
NO
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for Open in harness.
Ignition "OFF".
Disconnect ECM and TCM connectors.
Measure resistance between terminals 37 of the ECM harness connector and 4 of the TCM harness connector.
Specification : Approx. 0Ω
Is resistance within the specification?
YES
▶ Go to next step as below.
NO
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short to ground in harness.
Measure resistance between terminal 37 of the ECM harness connector and chassis ground.
Specification : Infinite
Is resistance within the specification?
YES
▶ Go to next step as below
NO
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short to battery in harness.
Reconnect the ECM connector.
Ignition "ON" & Engine "OFF".
Measure voltage between terminal 37 of the ECM harness connector and chassis ground.
Specification : Approx. 0V
Is voltage within the specification?
YES
▶ Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
