Mitsubishi Evolution X. Manual - part 246
IGNITION SYSTEM
TSB Revision
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.