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
.
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
).
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
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