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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?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure
	▶ Go to "Power Circuit Inspection" procedure.

Measure voltage between power terminal of the steering angle sensor harness connector and chassis ground.

Specification : Approx. B+

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Is the measured value within specifications?

▶ Go to "Ground Circuit Inspection" procedure.

▶ Repair open or short in power circuit between steering angle sensor harness connector and HECU harness connector, and then go to "Verification of vehicle Repair" procedure.

▶ If there is no problem in Power circuit, 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.

Measure resistance between ground terminal of the steering angle sensor harness connector and chassis ground.

Specification : Approx. below 1Ω

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Is the measured value within specifications?

	▶ Go to "Signal Circuit Inspection" procedure.
	▶ Repair open or short in ground circuit between steering angle sensor harness connector and HECU harness connector and then, go to "Verification of vehicle Repair" procedure.

Measure voltage between signal terminal of the HECU harness connector and chassis ground.

Specification : HIGH : 2.9±0.1V ~ 4.4±0.1V, LOW : 1.2±0.1V ~ 2.1±0.1V

note

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Is the measured value within specifications?

▶ 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.

▶ Repair open or short in signal circuit between the steering angle sensor harness connector and HECU harness connector and then, go to "Verification of vehicle Repair" procedure.

▶ If there is no problem in signal circuit, go to "Component Inspection" procedure.