Mitsubishi Evolution X. Manual — part 246

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-37

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

AK604156

Spark plug

AB

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

AK604157

AK604157

Defactive insulation

Defective insulation

Defective insulation

Good

AB

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.

SPARK PLUG CHECK AND CLEANING

M1163004301646

AK704210 AB

Iridium
tip

Platinum
tip

CAUTION

• Never attempt to adjust the gap of the iridium plug.
• Do not attempt to clean the spark plug because it may

result in damage to the electrode. However, if carbon
deposits must be removed, using a sand blast type
plug cleaner, complete the cleaning within 20 seconds
to protect the electrode. Do not use a wire brush.

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 state and clean it if nec-
essary.

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-38

SPARK PLUG GAP CHECK

AK704212AB

Pulg gap gauge

Measurement
direction

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

AK503737

1. Measure the insulation resistance. If the insulation

resistance of the spark plug is under the limited value, clean
the plug within 20 seconds using a plug cleaner.

2. After cleaning, measure the insulation resistance again.

Replace the plug unless it is within the limited value.

Limit: Minimum 10 M

Ω

CAMSHAFT POSITION SENSOR CHECK

M1163004400792

Refer to GROUP 13A, Multiport Fuel Injection (MFI)

− Multiport

Fuel Injection (MFI) Diagnosis

− Diagnostic Trouble Code Pro-

cedures

− DTC P0340: Intake Camshaft Position Sensor Circuit

P.13A-377

.

CRANKSHAFT POSITION SENSOR CHECK

M1163004500841

Refer to GROUP 13A, Multiport Fuel Injection (MFI)

− Multiport

Fuel Injection (MFI) Diagnosis

− Diagnostic Trouble Code Pro-

cedures

− DTC P0335: Crankshaft Position Sensor Circuit

P.13A-367

.

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-39

IGNITION COIL

REMOVAL AND INSTALLATION

M1163004001441

AC506572

AC704355

AC706231AC

1

2

4

3

9.5 ± 2.5 N·m
84 ± 22 in-lb

18 ± 2 N·m
13 ± 3 ft-lb

Removal steps

1.

Engine upper cover

2.

Ignition coil connector connection

3.

Ignition coil

4.

Spark plug

Removal steps (Continued)

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-40

CAMSHAFT POSITION SENSOR

REMOVAL AND INSTALLATION

M1163003401349

AC709301AB

1

2

3

4

5

N

N

9.5 ± 2.5 N·m
84 ± 22 in-lb

28 ± 8 N·m
21 ± 6 ft-lb

(Engine oil)

9.5 ± 2.5 N·m
84 ± 22 in-lb

6

7

(Engine oil)

Exhaust camshaft position
sensor removal steps

1.

Engine hanger

2.

Exhaust camshaft position sensor
connector connection

3.

Camshaft position sensor

4.

O-ring

Intake camshaft position
sensor removal steps

5.

Intake camshaft position sensor
connector connection

6.

Camshaft position sensor

7.

O-ring