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 "Power Circuit Inspection" procedure.

Power Supply Circuit Inspection

1. Ignition "OFF"
2. Disconnect HECU connector.
3. Ignition "ON".
4. Measure voltage between terminal "9" of the HECU harness connector and chassis ground.
A. Specification : Approx. B+




5. Is the measured voltage within specifications ?
YES
1) Go to "Ground Circuit Inspection" procedure.
NO
1) Check for open or short in the power harness between battery terminal (+) and terminal "9" of the HECU harness connector. Check for open or blown 30 A ABS fuse refering to "Circuit Diagram". Repair as necessary and then go to "Verification of vehicle Repair" procedure.

Ground Circuit inspection

1. Ignition "OFF".
2. Disconnect HECU connector.
3. Measure resistance between terminal "8, 24" of the HECU harness connector and chassis ground.
A. Specification : Approx. below 1 ohm




4. Is the measured resistance within specifications ?
YES
1) Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU and then go to "Verification of Vehicle Repair" procedure.
NO
1) Check for damaged harness and poor connection between terminal "8, 24" of the HECU harness connector and chassis ground. Repair as necessary and then go to "Verification of vehicle Repair" procedure.