W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) and terminal condition. 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 "ON" & Engine "OFF".
2. Turn the steering wheel to the left or right.
3. Measure signal waveform between terminal "3,28,30" of the HECU harness connector and chassis ground.
A. Specification : Check the voltage range (HIGH : 2.9 ± 0.1V ~ 4.4 ± 0.1V LOW : 1.2 ± 0.1V ~ 2.1 ± 0.1V) of the sensor
signal in case of turning left, turning right, center position.
If normal waveforms such as fig 1, 2, 3 are detected in each condition, It is normal.












4. Is the measured signal waveform 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 "1,4,5" of the steering angle sensor harness connector and terminal "3,28,30" of the HECU harness connector. Repair as necessary and then go to "Verification of vehicle Repair" procedure.
2) Go to "Component Inspection" procedure.