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

   Specification:  12V is measured only for approx. 0.5sec

   Fig 1: Measuring Voltage Between Terminal 4 Of A/T Control Relay Harness Connector And Chassis Ground

   Courtesy of HYUNDAI MOTOR CO.
5. 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.

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

   Specification:  Approx. 0 Ω

   Fig 2: Measuring Resistance Between Terminal 3 Of A/T Control Relay And Terminal 60 Of PCM/TCM Harness Connector

   Courtesy of HYUNDAI MOTOR CO.
4. Is resistance within specifications?

   YES 

   • Go to "GROUND CIRCUIT INSPECTION " procedure

   NO 

   • Check that A/T-20A 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