3.
Has a problem been found?
YES
a.
Repair as necessary and then go to "Verification of Vehicle Repair" procedure
NO
a.
Go to "Power circuit inspection" procedure
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 connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
YES
Repair as necessary and then go to "Verification of Vehicle Repair" procedure
NO
Go to "Power circuit inspection" procedure
Ignition "ON" & Engine "OFF".
Disconnect the "A/T CONTROL RELAY" connector
Measure the voltage between terminal "1" of the "A/T CONTROL RELAY" harness connector and chassis ground.
Specification : Approx. B+
Is voltage within specifications?
YES
Go to "Signal circuit inspection" procedure
NO
Check that A/T-30A Fuse in engine room junction is installed or not blown.
Check for Open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure
Ignition "OFF".
Disconnect the "A/T CONTROL RELAY" connector
Measure the voltage between terminal "4" of the "A/T CONTROL RELAY" harness connector and chassis ground.
Turn ignition switch OFF → ON
Specification: 12V is measured only for approx. 0.5sec
Is voltage within specifications?
YES
Go to "Check Supplying Power to solenoid valve" procedure
NO
Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure
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.
Ignition "OFF".
Disonnect the "A/T CONTROL RELAY" and PCM/TCM connector
Measure the resistance between terminal "3" of the "A/T CONTROL RELAY" harness connector and terminal "2, 3" of the PCM/TCM harness connector
Specification : Approx. 0 Ω
Is resistance within specifications?
YES
Go to "Ground circuit inspection" procedure
NO
Check for Open in C-35(2.7 GAS) joint connector
Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure
Ignition "OFF".
Connect the "A/T CONTROL RELAY" connector
Measure the resistance between terminal "2" of the "A/T CONTROL RELAY" harness connector and chassis ground
Specification : Approx. 0 Ω
Is resistance within specifications?
YES
Go to "Component inspection" procedure
NO
Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure
