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 injector extension 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 seonds.

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.

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 to create an electric spark in the spark plugs to ignite the fuel. Coils have an internal resistor while others rely on a resistor wire or an external resistor to limit the current flowing into the coil from the battery 12 V supply.

Ignition Coil Specifications

Specification

Item	Specification
Primary Coil Resistance (?)	0.61 ± 15% [20°C (68°F)]
Secondary Coil Resistance (k?)	7.5 ± 15% [20°C (68°F)]

Ignition Coil Schematic Diagrams

Circuit Diagram

Ignition Coil Repair procedures

Removal

1.	Turn ignition switch OFF and disconnect the negative (-) battery cable.

2.	Remove the engine cover.

3.	Disconnect the ignition coil connector (A). • When removing the ignition coil connector, pull the lock pin (A) and push the clip (B).

4.	Remove the ignition coil (A).

Installation

1.	Install in the reverse order of removal. Ignition coil installation bolts: 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 Ib-ft)

Inspection

1.	Measure the primary coil resistance between terminals 1 and 2. Standard value : 0.61 ? ± 15%

Spark Plug Description and Operation

Description

A spark plug is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture therein by means of an electric spark, while containing combustion pressure within the engine. A spark plug has a metal threaded shell, electrically isolated from a central electrode by a porcelain insulator.

Spark Plug Specifications

Specification

Item	Specification
Type	ELR9IQP9+
Gap	0.8 ~ 0.9 mm (0.0314 ~ 0.0354 in.)

Spark Plug Repair procedures

Inspection

[On vehicle inspection]

1.	Accelerate the engine to about 3,000 rpm 3 times or more.

2.	Remove the spark plug.

3.	Check the spark plug visually. If the electrode is dry, the spark plug is normal. If the electrode is wet, check the damage and electrode gap as below.

[Component Inspection]

1.	Check the spark plug for any damage on its thread and insulator. If there is damage, replace the spark plug.

2.	Check the electrode. Measure the insulation resistance with an ohmmeter. If the resistance is less than the specified value, adjust the electrode gap. Specification: 10 M? or more

3.

Check the spark plug electrode gap. If the gap is greater than the maximum, replace the spark plug. Specification: 0.8 ~ 0.9 mm (0.0314 ~ 0.0354 in.) • If adjusting the gap of a new spark plug, bend only the base of the ground electrode. Do not touch the tip. Never attempt to adjust the gap on a used plug.

Cleaning

The combustion temporarily becomes unstable, due to the aged fuel and the carbon deposits accumulated on the spark plug(s) after long-term storage.

[1st Method]

1.	Start the engine and keep the engine running at idle for 2 minutes.

2.	Step on the accelerator pedal and hold it steady at 4500 rpm with the shift lever in N position to warm up  the engine until the temperature of the engine coolant reaches 80°C.

3.	Keep the engine running at 2500~3000 rpm in the N position for 15 minutes.

[2nd Method]

• The 2nd method should be performed only if the 1st method fails (the misfire-related codes recur).

1.	Start the engine and keep the engine running at idle for 2 minutes.

2.	Drive the vehicle for over 20 minutes, keeping the engine speed above 3500 rpm. • If equipped with manual transaxle, shift the gear properly for keeping the engine speed above 3500 rpm.

Removal

1.	Remove the ignition coil. (Refer to Ignition System - "Ignition Coil")

2.	Using a spark plug wrench, remove the spark plug (A). • Be careful that no contaminates enter into spark plug holes.

Installation

1.	Install in the reverse order of removal. Tightening torque: 14.7 ~ 24.5 N.m (1.5 ~ 2.5 kgf.m, 10.9 ~ 18.0 Ib-ft)