Mitsubishi Lancer Evolution X. Manual - part 101

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-35

SYSTEM DIAGRAM

GENERAL SPECIFICATIONS

M1163000200097

SERVICE SPECIFICATIONS

M1163000300793

AK703692

1

2

3

4

AJ

ECM

Mass airflow sensor

Intake air temperature
sensor 1

Engine coolant
temperature sensor

Intake camshaft position
sensor

Crankshaft position
sensor

Throttle position sensor

Knock sensor

Ignition switch-ST

Clutch switch <M/T>

Ignition coil

Battery

Spark plug

Cylinder No.

Engine
control
relay

: Coil driver

Item

Specification

Ignition Coil
Type

Molded 4 coil

Spark Plugs
NGK

ILKR8E6

Item

Standard value

Limit

Spark plug gap mm (in)

0.5 − 0.6 (0.020 − 0.023)

0.75 (0.029)

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-36

SPECIAL TOOL

M1163000600589

ON-VEHICLE SERVICE

KNOCK CONTROL SYSTEM CHECK

M1163001800315

Check the knock sensor circuit if diagnostic trouble code, No. 
P0326, P0327 or P0328 is shown.
Refer to GROUP 13A, Multiport Fuel Injection (MFI) − Multiport 

Fuel Injection (MFI) Diagnosis − Diagnostic Trouble Code Chart 

P.13A-48

.

IGNITION COIL CHECK

M1163001201059

Required Special Tool:
MB991958: Scan Tool (M.U.T-III Sub Assembly)

• MB991824: V.C.I.
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
NOTE: It is impossible to carry out an easy check using a cir-
cuit tester because a diode and so on are integrated into the 
inside circuit of this ignition coil. Accordingly, check the ignition 
coil in the following procedure.
1. Make sure the diagnosis codes are not stored using scan 

tool MB991958. If stored, record the code No. Carry out the 
troubleshooting for the stored codes and solve the problems 
even if not related to the ignition.

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION

APPLICATION

MB992273
Spark plug brush

−

Cleaning spark plug

MB992273

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-37

2. Disconnect the injector connectors on all of the cylinders.
3. Disconnect the ignition coil connector.
4. Remove the ignition coil and install a good spark plug to the 

ignition coil.

5. Connect the ignition coil connector.
6. Ground the side electrode of the spark plug and crank the 

engine.

7. Check that spark is produced between the electrodes of the 

spark plug.

8. If the spark plug has weak spark or no spark, carry out the 

same check using a good ignition coil. If there is strong 
spark on this check with a good ignition coil, it becomes 
clear there is a problem with the ignition coil. Replace the 
ignition coil with a new one. If there is no spark on this check 
with a good ignition coil, there is probably a problem with the 
ignition circuit. Check the ignition circuit.

9. Using scan tool MB991958, make sure whether the 

diagnosis codes are stored due to the check, or not. Except 
the codes stored in Step 1, clear the codes all together if 
they are present. And then, carry out the troubleshooting 
about the codes recorded.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
10.Disconnect scan tool MB991958 to the data link connector.

SPARK PLUG TEST

M1163001500206

1. Remove the spark plug and connect to the ignition coil.

2. Ground the spark plug outer electrode (body), and crank the 

engine.
Check that there is an electrical discharge between the 
electrodes at this time.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

AK604156

Spark plug

AB

AK604157

Defective insulation

Defective insulation

Defective insulation

Good

AC

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-38

SPARK PLUG CHECK AND CLEANING

M1163004301970

Required Special Tool
MB992273: Spark Plug Brush

CAUTION

• Never attempt to adjust the gap of the iridium plug.
• Do not attempt to clean the iridium plug using a wire 

brush because it may result in damage to the electrode. 
When the iridium plug is cleaned, use a plug cleaner, 
sand blast type, or special tool Spark Plug Brush 
(MB992273).

NOTE: Obey the maintenance interval of the relevant vehicle 
for the spark plug replacement. If the plug gap and insulation 
resistance are normal, check the plug condition and clean if 
necessary.

SPARK PLUG GAP CHECK

.

Check the plug gap with the wire type plug gauge. Replace it if 
the limit is exceeded.

Standard value: 0.5 − 0.6 mm (0.020 − 0.023 inch)

Limit: 0.75mm (0.029 inch)

SPARK PLUG INSULATION RESISTANCE CHECK

1. Measure the insulation resistance of the spark plug. If the 

insulation resistance of the spark plug is under the limited 
value, clean the spark plug (Refer to 

P.16-39

).

2. After cleaning, measure the insulation resistance again. 

Replace the plug unless it is within the limited value.

Limit: Minimum 10 MΩ

AK704210 AB

Iridium 
tip

Platinum
tip

AK704212AB

Pulg gap gauge

Measurement
direction

AK503737