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. Engine 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 KIA MOTORS AMERICA, INC.
5. Is voltage within specifications?
  YES
  - Go to 2"Check Supplying Power to solenoid valve" procedure.
  NO
  - Check for open in harness. Repair as necessary and Go to "VERIFICATION OF 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 "49" and "50" of the PCM/TCM harness connector.
  Specification : Approx. 0 Ω
  
  Fig 2: Measuring Resistance Between Terminal 3 Of A/T Control Relay Harness And 49 And 50 Of PCM/TCM Harness Connector
  Courtesy of KIA MOTORS AMERICA, INC.
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 OF VEHICLE REPAIR " procedure.