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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.

Has a problem been found ?

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

Measure voltage between power terminal of the wheel speed sensor harness connector and chassis ground.

Specification : Approx. B+

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Is the measured value within specifications ?

▶ Go to "Signal Circuit Inspection" procedure.

▶ Repair open or short in power circuit between HECU harness connector and wheel speed sensor 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 waveform between wheel speed sensor signal terminal of the HECU harness connector and chassis ground with osciloscope.

Specification : High : 1.18~1.68V , Low : 0.59~0.84V

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Is the measured waveform within specifications?

▶ Fault is intermittent caused by poor connection in wheel speed sensor harness (RL) and/or HECU's connector or was repaired and HECU memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.

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

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