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. [2.4L]
  Measure the resistance between terminal "3" of the "A/T CONTROL RELAY" harness connector and terminal "49/50" of the TCM (PCM) harness connector.
  
  [2.7L]
  
  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 2 Of A/T Control Relay 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.