3.
Measure resistance between terminals 77 and 78 of the ECM harness connector.
1)
Specification : Approx. 110~130Ω
Ignition "OFF"
Disconnect ECM harness connector
Measure resistance between terminals 77 and 78 of the ECM harness connector.
Specification : Approx. 110~130Ω
Is resistance within the specification?
YES
Go to next step as below
NO
Check for open in wiring related to the CAN communication(ECM, EPS, MTS and vertical resistor at the junction box). Repair as necessary and then go to "Verification of Vehicle Repair" procedure
Vertical Resistor Resistance : Approx. 110~130Ω
Measure resistance between terminal 77 of the ECM harness connector and chassis ground.
Measure resistance between terminal 78 of the ECM harness connector and chassis ground.
Specification : Infinite(above 10㏀)
Is resistance within the specification?
YES
Go to next step as below
NO
Repair CAN communication line for a short to ground. And then go to "Verification of Vehicle Repair" procedure
Disconnect the connectors related to the CAN communication
Ignition "ON" & Engine "OFF"
Measure voltage between terminal 77 of the ECM harness connector and chassis ground.
Measure voltage between terminal 78 of the ECM harness connector and chassis ground.
Specification : Approx. 0V
Is voltage within the specification?
YES
Go to next step as below
NO
Repair CAN communication line for a short to battery. And then go to "Verification of Vehicle Repair" procedure
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 next step as below
