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 Supply Circuit Inspection" procedure.

Power Supply Circuit Inspection

1. Ignition "ON" & Engine "OFF".
2. Measure voltage between terminal "6" of the steering wheel angle sensor harness connector and chassis ground.
A. Specification: Approx. B+




3. Is the measured voltage within specifications ?
YES
1) Go to "Ground Circuit Inspection" procedure.
NO
1) Check for open or blown 10A fuse referring to "Circuit Diagram". Repair as necessary and then go to "Verification of vehicle Repair" procedure.
2) If OK, check for open or short to GND in steering angle sensor harness between the battery terminal (+) and terminal "6" of the steering angle sensor harness connector. Repair as necessary and then go to "Verification of vehicle Repair" procedure.

Ground Circuit inspection

1. Ignition "OFF".
2. Disconnect steering wheel angle sensor connector.
3. Measure resistance between terminal "2" of the steering wheel angle sensor harness connector and chassis ground.
A. Specification: Approx. below 1 Ohm




4. Is the measured resistance within specifications ?
YES
1) Go to "Signal Circuit Inspection" procedure.
NO
1) Check for open or short in steering wheel angle sensor harness between terminal "2" of the steering angle sensor harness connector and terminal "31" of the HECU harness connector. Repair as necessary and then go to "Verification of vehicle Repair" procedure.

Signal Circuit Inspection

1. Ignition "ON" & Engine "ON".
2. Measure voltage between terminal "8, 39, 40" of the HECU harness connector and chassis ground.
A. Specification: HIGH : 2.9 ± 0.1V ~ 4.4 ± 0.1V LOW : 1.2 ± 0.1V ~ 2.1 ± 0.1V




3. Is the measured voltage 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 open or short in steering wheel angle sensor harness between terminal "3, 4, 5" of the steering angle sensor harness connector and terminal "39, 40, 8" of the HECU harness connector. Repair as necessary and then go to "Verification of vehicle Repair" procedure.
2) If OK, Go to "Component Inspection" procedure.