PCM Inspection

Ignition "OFF"
Connect VMI to GDS and set up an oscilloscope as follow (4-channel);
Channel A (+): Pin No. 1 (COM) terminal of Alternator.

Channel A (-): Pin No. 2 (L) terminal of Alternator.

Channel B (+): Pin No. 3 (FR) terminal of Alternator.

Channel B (-): Pin No. 1 (LIN Line) terminal of Battery Sensor.
Ignition "ON"
Test Condition: Engine Idle & No Electrical Load and Electrical Load.
Specification: Refer to Fig 1 below

Fig 1: Scantool Display - Alternator Signal Waveform At Idle And No Electrical Load
Courtesy of KIA MOTORS AMERICA, INC.
Is measured value within specification?
YES
- Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Carefully re-do this troubleshooting guide steps.
- If the diagnostics have been performed correctly with no failure found, replace the PCM and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.