Kia Carens. Instruction — part 5

Engine Electrical System

General Information

Engine Electrical System

2001 > 1.8L DOHC >

GENERAL DESCRIPTION

Ignition system overview

The Dual Overhead Cam(DOHC) Engine Ignition System is now a Distributorless Ignition System(DLI) type. This system
is similar to the one currently used on Sephia/Shuma vehicles. The key components of this system are :

• 2 Separate Coil Packs
• A Crankshaft Position Sensor that provides engine RPM information to the ECM.
• An Ignition Control Module built into the ECM.
• A Canshaft Position Sensor that provides engine firing order information to the ECM
• Spark Plug Wires and Spark Plugs

Ignition system function

In a conventional ignition system, the ignition coil produces a high voltage current and the disributor thenrelays this
current at the required time, to each spark plug. In the disctributirless ignition system, two sensors the camshaft position
sensor and the crankshaft position sensor, tell the Engine Control Module (ECM) which cylinder is ready to fire.
The ECM then sends an ignition signal to an electronic ignition coil. This ignition coil then produces and sends a high
voltage current to the proper spark plug.

Electronic spark advance system

Ignition Timing is determined and set within the ECM based on signals from various sensors and switches.
Optimum performance is gained with this system. The ECM varies ignition timing according to engine speed, intake air
amountm coolant temperature and other conditions.

• Timing specification at idle is : 8 ± 5° BTDC
• Timing is not adjustable.

Ignition system components

The mechanical, rotating high-voltage distrivutor mechanism has been replaced by static electronically controlled
components. These components are described below.

Ignition coil

1. Two ignition coil are used in this system. The engine locates them directly above the #2 and #4 spark plugs. The coil

resistance is dentical for these two coils and there is no maintenance required for them.
If determined to be faulty, they must be replaced.

High-tension leads

The high-tension leads connect the two ignition coils to the spark plugs. Their function is basically the same as on the
previous system. Because of their shorter length, the DLI high-tension leads enhance the ignition systems delivered
voltage. In addition, they reduce the wave interference from one high tension wire to another.

Spark plugs

The spark plugs provide the air gap necessary to produce an arc from the electrical energy coming in from the ignition
coil. This arc then ignites the fuel/air mixture in the cylinder, producing power.