W/Harness Inspection

Terminal and Connector Inspection

1. 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.
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 go to "Verification Vehicle Repair" procedure
NO
1) Go to "Signal Circuit Inspection" procedure

Signal Circuit Inspection

1. Ignition "ON" & Engine "OFF".
2. Disconnect the "INPUT SPEED SENSOR" connector
3. Measure voltage between terminal "2" of the INPUT SPEED SENSOR harness connector and chassis ground.
A. Specification : Approx. 5V




4. Is voltage within specifications ?
YES
1) Go to "Power Circuit Inspection" procedure
NO
1) Check for open or short in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure
2) If signal circuit in harness is OK, Go to "Check PCM/TCM" of the "Component Inspection" procedure.

Power Supply Circuit Inspection

1. Ignition "ON" & Engine "OFF".
2. Disconnect the "INPUT SPEED SENSOR" connector
3. Measure voltage between terminal "3" of the INPUT SPEED SENSOR harness connector and chassis ground.
A. Specification : Approx. B+




4. Is voltage within specifications ?
YES
1) Go to "Ground Circuit Inspection" procedure
NO
1) Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure

Ground Circuit inspection

1. Ignition "ON" & Engine "OFF".
2. Disconnect the "INPUT SPEED SENSOR" connector
3. Measure resistance between terminal "1" of the INPUT SPEED SENSOR harness connector and chassis ground.
A. Specification : Approx. 0 ohms




4. Is resistance within specifications ?
YES
1) Go to "Component Inspection" procedure
NO
1) Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure
2) If ground circuit in harness is OK, Go to "Check PCM/TCM" of the "Component Inspection" procedure