Kia Optima: Engine Electrical System / Ignition System

Kia Optima DL3 2019-2020 Service and Repair Manual / Engine Electrical System / Ignition System

Description and operation
Description

Ignition timing is controlled by the electronic control ignition timing system.

The standard reference ignition timing data for the engine operating conditions are pre-pro grammed in the memory of the ECM (Engine Control Module).

The engine operating conditions (speed, load, warm-up condition, etc.) are detected by the various sensors. Based on these sensor signals and the ignition timing data, signals to interrupt the primary current are sent to the ECM.

The ignition coil is activated, and timing is controlled.

Repair procedures
On-vehicle Inspection
Inspect ignition coil assembly and Perform spark test
1.

Check for DTCs.

  

If a DTC is present, perform troubleshooting in accordance with the procedure for that DTC. (Refer to DTC guide)

2.

Check if sparks occur.

(1)

Remove the engine cover.

(2)

Remove the ignition coils.

(3)

Using a spark plug wrench, remove the spark plugs.

(4)

Disconnect the 4 injector connectors.

(5)

Ground the spark plug to the engine.

(6)

Check if sparks occur at each spark plug while engine is being cranked.

  

Do not crank the engine for more then 5 seconds.

3.

If sparks do not occur, perform the following test.

4.

Using a spark plug wrench, install spark plugs.

5.

Install the ignition coils.

6.

Install the engine cover.

Troubleshooting
Troubleshooting

Symptom
Suspect Area
Remedy
Engine will not start or is hard to
start (Cranks OK)
Ignition lock switch
Inspect ignition lock switch, or replace as required
Ignition coil
Inspect ignition coil, or replace as required
Spark plugs
Inspect spark plugs, or replace as required
Ignition wiring disconnected or broken
Repair wiring, or replace as required
Rough idle or stalls
Ignition wiring
Repair wiring, or replace as required
Ignition coil
Inspect ignition coil, or replace as required
Engine hesitates/poor acceleration
Spark plugs and spark plug cables
Inspect spark plugs / cable, or replace as required
Ignition wiring
Repair wiring, or replace as required
Poor mileage
Spark plugs and spark plug cables
Inspect spark plugs / cable, or replace as required

Engine Electrical System
Service data Service Data Ignition System Ignition Coil Item Specification Primary Coil Resistance (Ω) 0.75 ± 15% ...

Ignition Coil
Description and operation Description An ignition coil is an induction coil in an engine's ignition system which transforms the battery's low voltage to the high voltage needed ...

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