3.
Has a problem been found?
YES
a.
Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
a.
Go to "Power Circuit Inspection" 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 then go to "Verification of Vehicle Repair" procedure.
NO
Go to "Power Circuit Inspection" procedure.
Ignition "ON" & Engine "OFF".
Measure voltage between terminal "2" of the steering wheel angle sensor harness connector and chassis ground.
Specification : Approx. B+
Is the measured voltage within specifications?
YES
Go to "Ground Circuit Inspection" procedure.
NO
Check for open or blown 10A fuse referring to "Circuit Diagram". Repair as necessary and then go to "Verification of vehicle Repair" procedure.
If OK, check for open or short to GND in steering wheel angle sensor harness between the battery terminal(+) and terminal "2" of the steering wheel angle sensor harness connector. Repair as necessary and then go to "Verification of vehicle Repair" procedure.
Ignition "OFF".
Disconnect steering wheel angle sensor connector.
Measure resistance between terminal "3" of the steering wheel angle sensor harness connector and chassis ground.
Specification : Approx. below 1Ω
Is the measured resistance within specifications?
YES
Go to "Signal Circuit Inspection" procedure.
NO
Check for open or short in steering wheel angle sensor harness between terminal "3" of the steering wheel angle sensor harness connector and terminal "31" of the HECU harness connector. Repair as necessary and then go to "Verification of vehicle Repair" procedure.
Ignition "ON" & Engine "ON".
Turn the steering wheel to the left or right.
Measure signal waveform between terminal "1,4,5" of the steering wheel angle sensor harness connector and chassis ground.
Specification : HIGH : 2.9±0.1V ~ 4.4±0.1V LOW : 1.2±0.1V ~ 2.1±0.1V
Is the measured signal waveform within specifications?
YES
Go to "Component Inspection" procedure.
NO
Check for open or short in steering wheel angle sensor harness between terminal "1,4,5" of the steering wheel angle sensorr harness connector and terminal "39,40,8" of the HECU harness connector. Repair as necessary and then go to "Verification of vehicle Repair" procedure.
If OK, substitute with a known-good steering wheel angle sensor and check for proper operation. If problem is corrected, replace steering wheel angle sensor and then go to "Verification of Vehicle Repair" procedure.
