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 then go to "Verification of Vehicle Repair" procedure
NO
1) Go to "Power Circuit Inspection" procedure

Power Supply Circuit Inspection

1. Ignition "ON" & Engine "OFF".
2. Disconnect the "A/T CONTROL RELAY" connector
3. Measure the voltage between terminal "1" of the "A/T CONTROL RELAY" harness (JC101) connector and chassis ground.
A. Specification : Approx. B+




4. Is voltage within specifications?
YES
1) Go to "Signal Circuit Inspection" procedure
NO
1) Check that A/T-15A Fuse in engine room junction is installed or not blown.
2) Check for Open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure

Signal Circuit Inspection

Check A/T control relay harness
1. Ignition "OFF".
2. Disconnect the "A/T CONTROL RELAY" connector
3. Measure the voltage between terminal "4" of the "A/T CONTROL RELAY" harness connector and chassis ground.
4. Turn ignition switch OFF -> ON
A. Specification: 12V is measured only for approx. 0.5 sec




5. Is voltage within specifications?
YES
1) Go to "Check Supplying Power to solenoid valve" procedure
NO
1) Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure
2) If signal circuit is OK, Substitute with a known-good PCM/TCM and check for proper operation. If the problem is corrected, replace PCM/TCM and then go to "Verification of Vehicle Repair" procedure.
Check Supplying Power to solenoid valve harness
1. Ignition "OFF".
2. Disconnect the "A/T CONTROL RELAY" and PCM/TCM connector
3. Measure the resistance between terminal "3" of the "A/T CONTROL RELAY" harness connector and terminal "60" of the PCM/TCM harness connector
A. Specification : Approx. 0 Ohm




4. Is resistance within specifications?
YES
1) Go to "Ground Circuit Inspection" procedure
NO
1) Check that A/T-15A Fuse in engine room junction is installed or not blown.
2) Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure

Ground Circuit inspection

1. Ignition "OFF".
2. Connect the "A/T CONTROL RELAY" connector
3. Measure the resistance between terminal "2" of the "A/T CONTROL RELAY" harness connector and chassis ground
A. Specification : Approx. 0 Ohm




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