Ignition System Inspection

Ignition "OFF".
Disconnect ignition coil harness connectors from the ignition coils.
Perform visual inspection.
- Check contamination or damage on ignition coils.
Ignition "ON", Engine "OFF".
Measure the voltage between power terminal of ignition coils #1, #2, #3, #4 harness connector and chassis ground.
Specification: Approx 12V
Connect ignition coil harness connectors to the ignition coils.
Compare with the reference value below and ignition primary waveform to and determine whether the values are normal or not.

Fig 1: Scantool Display - Engine Idle After Warm-Up
Courtesy of KIA MOTORS AMERICA, INC.

Primary ignition control time - Approx. 750us

CH. A - Primary ignition MAX 266V

CH. AUX - Primary ignition current MAX 10.4A

YES
- Go to "Check Injector Performance " procedure below.
NO
- Substitute with a known-good ignition coil and check for proper operation. If the problem is corrected, replace ignition coil and then go to "Verification of Vehicle Repair " procedure.