2007 MITSUBISHI LANCER EVOLUTION Service Repair Manual

ENGINE ELECTRICAL -Ignition System16-29
SPARK PLUG CHECK, CLEANING AND REPLACEMENT
SPARK PLUG GAP CHECK
Caution
1. Do not adjust the gap of the iridium plug.
2. Cleaning of the iridium plug could damage the tip of the electrode. Thus, if the plug must
be cleaned because of soot, etc., use a plug cleaner and clean within a short time of 20 seconds
or less to protect the electrode. Do not use a wire brush, etc.
3. Even when the functions of the iridium plug are normal, the electrode section may be blackened.
However, the adhered carbon has properties that easily burned off compared to the conventional
type, so there is no problem. Check the quality of the spark plug by checking the insulation
resistance.
Check the plug gap, and replace if the checked value is more than the limit value.
Standard value, limit value:
MakerModelStandard value (mm)Limit value (mm)
NGKIGR7A-G0.6 - 0.70.75
DENSOVW22PR-DA70.6 - 0.70.75
SPARK PLUG INSULATION RESISTANCE CHECK
Measure the insulation resistance of the spark plug, and
replace if the measured value is less than the limit value.
Limit value: 1 MΩ
CAMSHAFT POSITION SENSOR CHECK
Refer to GROUP 13A - Troubleshooting.
CRANK ANGLE SENSOR CHECK
Refer to GROUP 13A - Troubleshooting.
DETONATION SENSOR CHECK
Check the detonation sensor circuit if self-diagnosis code,
No. 31 is shown.
NOTE
For information concerning the self-diagnosis codes, refer
to GROUP 13A - Troubleshooting.

ENGINE ELECTRICAL -Ignition System16-30
WAVEFORM CHECK USING AN ANALYZER
Ignition Secondary Voltage Waveform Check
MEASUREMENT METHOD
1. Clamp the secondary pickup around the spark plug cable.
NOTE
(1) The peak ignition voltage will be reversed when the
spark cables No. 2 and No. 4, or No. 1 and No.
3 cylinders are clamped.
(2) Because of the two-cylinder simultaneous ignition
system, the waveforms for two cylinders in each group
appear during waveform observation (No. 1 cylinder
- No. 4 cylinder, No. 2 cylinder - No. 3 cylinder).
However, waveform observation is only applicable
for the cylinder with the spark plug cable clamped
by the secondary pickup.
(3) Identifying which cylinder waveform is displayed can
be difficult. For reference, remember that the
waveform of the cylinder attached to the secondary
pickup will be displayed as stable.
2. Clamp the spark plug cable with the trigger pickup.
NOTE
Clamp the trigger pickup to the same spark plug cable
clamped by the secondary pickup.

ENGINE ELECTRICAL -Ignition System16-31
STANDARD WAVEFORM
Observation Conditions
FunctionSecondary
Pattern heightHigh (or Low)
Pattern selectorRaster
Engine revolutionsCurb idle speed
kV
Secondary
ignition
voltage
waveformIgnition voltage
(point D)
Dwell
section
Point CSpark line (point A)
Wave damping
reduction section
(point B)
Time
Observation Condition (The only change from above condition is the pattern selector.)
Pattern selectorDisplay
Secondary
ignition
voltage
waveformkV
No. 4 cylinder
No. 2 cylinder
ignition noiseNo. 1 cylinderNo. 3 cylinder
ignition noise
Neutral section 0
2Time

ENGINE ELECTRICAL -Ignition System16-32
WAVEFORM OBSERVATION POINTS
Point A: The height, length and slope of the spark line show the following trends (Refer to abnormal
waveform examples, 1, 2, 3 and 4).
Spark linePlug gapCondition of
electrodeCompression
forceConcentration of
air mixtureIgnition timingSpark plug
cable
LengthLongSmallNormalLowRichAdvancedLeak
ShortLargeLarge wearHighLeanRetardedHigh
resistance
HeightHighLargeLarge wearHighLeanRetardedHigh
resistance
LowSmallNormalLowRichAdvancedLeak
SlopeLargePlug is fouled----
Point B: Number of vibration in reduction vibration section (Refer to abnormal waveform example 5)
Number of vibrationsCoil and condenser
Three or moreNormal
Except aboveAbnormal
Point C: Number of vibrations at beginning of dwell section (Refer to abnormal waveform example 5)
Number of vibrationsCoil
5 - 6 or higherNormal
Except aboveAbnormal
Point D: Ignition voltage height (distribution per each cylinder) shows the following trends.
Ignition
voltagePlug gapCondition of
electrodeCompression
forceConcentration of
air mixtureIgnition timingSpark plug cable
HighLargeLarge wearHighLeanRetardedHigh resistance
LowSmallNormalLowRichAdvancedLeak

ENGINE ELECTRICAL -Ignition System16-33
EXAMPLES OF ABNORMAL WAVEFORMS
Abnormal waveformWave characteristicsCause of problem
Example 1
01P0215
Spark line is high and short.Spark plug gap is too large.
Example 2Spark line is low and long, and is
sloping.
Also, the second half of the spark line
is distorted. This could be a result of
misfiring.Spark plug gap is too small.
Example 3Spark line is low and long, and is
sloping. However, there is almost no
spark line distortion.Spark plug gap is fouled.
Example 4Spark line is high and short.
Difficult to distinguish between this
and abnormal waveform example 1.Spark plug cable is nearly falling off.
(Causing a dual ignition)
Example 5No waves in wave damping section.Layer short in ignition coil

ENGINE ELECTRICAL -Ignition System16-34
IGNITION COIL
REMOVAL AND INSTALLATION
Pre-removal and Post-installation Operation
Center Cover Removal and Installation (Refer to GROUP 11A - Camshaft and Camshaft Oil Seal.)
10±2 N·m
12
25±4 N·m
3
4
14
5
10±2 N·m
Removal steps
1. Ignition coil connector
2. Spark plug cable No.1
3. Spark plug cable No.34. Ignition coil
5. Spark plug

ENGINE ELECTRICAL -Ignition System16-35
CAMSHAFT POSITION SENSOR
REMOVAL AND INSTALLATION
1 2
3
8.8±1.0 N·m
Removal steps
1. Camshaft position sensor connector
2. Camshaft position sensor
3. O-ring
CRANK ANGLE SENSOR
REMOVAL AND INSTALLATION
Caution
If the vehicle is equipped with the Brembo disc brake, during maintenance, take care not to contact
the parts or tools to the caliper because the paint of caliper will be scratched.
Pre-removal and Post-installation Operation
DCenter Cover Removal and Installation (Refer to GROUP 11A - Camshaft and Camshaft Oil Seal.)
DTiming Belt Removal and Installation (Refer to GROUP 11A.)
DReserve Tank Removal and Installation (Refer to GROUP 14 - Radiator.)

ENGINE ELECTRICAL -Ignition System16-36
12
3
8.8±1.0 N·m
4 5
6 7
8.8±1.0 N·m49±9 N·m
49±9 N·m40±5 N·m 12±2 N·m
22±4 N·m
22±4 N·m
12±2 N·m
22±4 N·m
Removal steps
1. Power steering oil pressure switch
connector
2. Heat protector
AA"3. Power steering oil pump, bracket and
oil reservoir assembly4. Power steering oil pump bracket
5. Crank angle sensor connector
6. Crank angle sensor
7. Connector bracket
REMOVAL SERVICE POINT
AA"POWER STEERING OIL PUMP, BRACKET AND
OIL RESERVOIR ASSEMBLY REMOVAL
Remove the power steering oil pump, bracket and oil reservoir
assembly with the hose attached from the bracket.
NOTE
Tie the removed oil pump with a rope and set aside where
they cannot hinder the removal of the power steering oil pump
bracket.