W/Harness Inspection

Terminal and Connector Inspection

1. 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.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage.
3. Has a problem been found?
YES
1) Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
1) Go to "Signal Circuit Inspection" procedure.

Signal Circuit Inspection

1. Ignition "OFF".
2. Measure resistance between terminal "10" of the HECU harness connector and terminal "11" of the HECU harness connector.
A. Specification : Approx. 60 Ohms




3. Is the measured resistance within specifications?
YES
1) Fault is intermittent caused by open or short in CAN signal harness or was repaired and HECU memory was not cleared. Go to "CAN Bus Short (to ground) Inspection" procedure.
NO
1) Check for open or short in CAN signal harness between terminal "10" of the HECU harness connector and terminal "11" of the HECU harness connector. Repair as necessary and then go to "Verification of vehicle Repair" procedure.

CAN Bus Short (to ground) Inspection

1. Ignition "OFF".
2. Disconnect the HECU harness connector.
3. Measure resistance between terminal "11,15" of the HECU harness connector and chassis ground.
A. Specification : Approx. Infinity Ohms




4. Is the measured resistance within specifications?
YES
1) Go to "CAN Bus Short (between HIGH and LOW) Inspection" procedure.
NO
1) Check for short to ground in CAN HIGH signal harness in case of abnormal resistance measured between terminal "11" of the HECU harness connector and chassis ground. Repair as necessary and then go to "Verification of vehicle Repair" procedure.
2) Check for short to ground in CAN LOW signal harness in case of abnormal resistance measured between terminal "10" of the HECU harness connector and chassis ground. Repair as necessary and then go to "Verification of vehicle Repair" procedure.

CAN Bus Short (between HIGH and LOW) Inspection

1. Ignition "OFF".
2. Disconnect all the connector related to CAN such as HECU, ECM, EPS, ECS harness connector.
3. Measure resistance between terminal "10,11" of the HECU harness.
A. Specification : Approx. Infinity Ohms




4. Is the measured resistance within specifications?
YES
1) Go to "Component Inspection" procedure.
NO
1) Check for short in CAN signal harness between terminal "10" of the HECU harness connector and terminal "11" of the HECU harness connector. Repair as necessary and then go to "Verification of vehicle Repair" procedure.