Many malfunctions in the electrical system are caused by poor harness and terminals.

Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

Thoroughly check all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.

Has a problem been found?

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

Ignition "OFF"

Refer to "Shop Manual" and disconnect input speed sensor connector.

Ignition "ON"

Measure voltage between Pin No. 1 (Power) terminal of input speed sensor harness connector and chassis ground.

Is measured value within specification?

	▶ Go to "Signal Circuit Inspection" procedure.
	▶ Repair open or short in power circuit between input speed sensor and TCM and then go to "Verification of vehicle Repair" procedure.

Ignition "OFF"

Refer to "Shop Manual" and disconnect input speed sensor connector.

Ignition "ON"

Measure voltage between Pin No. 2 (Signal) terminal of input speed sensor harness connector and chassis ground.

Ignition "OFF"

Measure resistance between Pin No. 2 (Signal) terminal of input speed sensor harness connector and chassis ground.

Is measured value within specification?

▶ Fault might be intermittent and caused either by poor contact in connectors or wiring harness, or it has been repaired and control module memory is not cleared yet. Thoroughly check terminal of battery, all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage. ▶ Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.

▶ Repair open or short to ground in signal circuit between input speed sensor and then go to "Verification of vehicle Repair" procedure. ▶ If problem still occurs, go to "component Inspection" procedure.