2005 MITSUBISHI LANCER Workshop Manual

IGNITION SYSTEM
ENGINE ELECTRICAL16-33
SPARK PLUG CHECK AND CLEANING
<4G6>
M1163004300353
CAUTION
When pulling off the spark plug cable from the
plug always hold the cable cap, not the cable.
1. Remove the spark plug cables.
2. Remove the spark plugs.
CAUTION
•Do not attempt to adjust the gap of the iridium
plug.
•Always use a plug cleaner and finish cleaning
within 20 seconds. Do not use wire brushes.
Otherwise, the iridium and platinum tip may
be damaged.
3. Check the plug gap and replace if the limit is
exceeded.
Standard value: 1.0 − 1.1 mm
Limit: 1.3 mm
CAUTION
Be careful not to allow foreign matter in
cylinders.
4. Clean the engine plug holes.
5. Install the spark plugs.
CAMSHAFT POSITION SENSOR CHECKM1163004400219
Check the camshaft position sensor circuit if
self-diagnosis code No. P0340 is shown.
(Refer to GROUP 13A − Troubleshooting −
Inspection chart for diagnosis code <4G1> P.13A-15
or GROUP 13B − Troubleshooting − Inspection chart
for diagnosis code <4G6> P.13B-15 ).
CRANK ANGLE SENSOR CHECKM1163004500272
Check the crank angle sensor circuit if self-diagnosis
code No. P0335 is shown.
(Refer to GROUP 13A − Troubleshooting −
Inspection chart for diagnosis code <4G1> P.13A-15
or GROUP 13B − Troubleshooting − Inspection chart
for diagnosis code <4G6> P.13B-15 ).
DETONATION SENSOR CHECKM1163002900047
Check the detonation sensor circuit if self-diagnosis
code No. P0325 is shown.
(Refer to GROUP 13A − Troubleshooting −
Inspection chart for diagnosis code <4G1> P.13A-15
or GROUP 13B − Troubleshooting − Inspection chart
for diagnosis code <4G6> P.13B-15).
IGNITION SECONDARY VOLTAGE
WAVEFORM CHECK USING AN
OSCILLOSCOPE
M1163001700170
MEASUREMENT METHOD
1. Clamp the secondary pickup around the spark
plug cable.
NOTE: .
•The peak ignition voltage will be reversed
when the spark plug cables No. 2 and No. 4,
or No. 1 and No. 3 cylinders are clamped.
•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.
•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.
AKX00383
AL
Platinum
tipIridium
tip

IGNITION SYSTEM
ENGINE ELECTRICAL16-34
STANDARD WAVEFORM
Observation Conditions
Observation Conditions (The only change from above condition is the pattern selector.)Function Secondary
Pattern height High (or Low)
Pattern selector Raster
Engine revolutions Curb idle speed
Pattern selector Display
AKX00278
kV
0 Secondary
ignition voltage
wave patternIgnition voltage
(point D)Spark line (point A)
Dwell sectionWave dampling reduction section (point B)
Point C
Time
AD

IGNITION SYSTEM
ENGINE ELECTRICAL16-35
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).
Point B: Number of vibration in reduction vibration section (Refer to abnormal waveform example 5)
Point C: Number of vibrations at beginning of dwell section (Refer to abnormal waveform example 5)
Point D: Ignition voltage height (distribution per each cylinder) shows the following trends.
AKX01275
kV
Secondary ignition
voltage wave pattern
0
2NO. 1 cylinder
NO. 3 cylinder
ignition noise
Newtral sectionNO. 4 cylinderNO. 2 cylinder
ignition noise
Time
AC
Spark line Plug gap Condition of
electrodeCompression
force Concentration
of air mixtureIgnition
timingSpark plug
cable
Length Long Small Normal Low Rich Advanced Leak
Short Large Large wear High Lean Retarded High
resistance
Height High Large Large wear High Lean Retarded High
resistance
Low Small Normal Low Rich Advanced Leak
Slope Large Plug is fouled
−− −−
Number of vibrations Coil and condenser
3 or more Normal
Except above Abnormal
Number of vibrations Coil
5 − 6 or higher Normal
Except above Abnormal
Ignition
voltagePlug gap Condition of
electrodeCompression
forceConcentration
of air mixtureIgnition
timingSpark plug
cable
High Large Large wear High Lean Retarded High
resistance
Low Small Normal Low Rich Advanced Leak

IGNITION SYSTEM
ENGINE ELECTRICAL16-36
EXAMPLES OF ABNORMAL
WAV E F O R M S
Example 1
•Wave characteristics
Spark line is high and short.
•Cause of problem
Spark plug gap is too large.
Example 2
•Wave characteristics
Spark 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.
•Cause of problem
Spark plug gap is too small.Example 3
•Wave characteristics
Spark line is low and long, and is sloping.
However, there is almost no spark line
distortion.
•Cause of problem
Spark plug gap is fouled.
Example 4
•Wave characteristics
Spark line is high and short.
Difficult to distinguish between this and abnormal
waveform example 1.
•Cause of problem
Spark plug cable is nearly falling off (Causing a
dual ignition).
Example 5
•Wave characteristics
No waves in wave damping section.
•Cause of problem
Layer short in ignition coil.
AKX00280
AKX00281
AKX00282
AKX00283
AKX00284

IGNITION SYSTEM
ENGINE ELECTRICAL16-37
IGNITION COIL RELAY CHECKM1163006500018
AC301727
2 1
3 4
AC304311AB
Battery
Ignition coil relay
Battery
voltageTerminal No.to
be connected to
testerContinuity test
results
Not applied 1 − 4 Open circuit
Connect
terminal
No.2 and
battery (+)
terminal.
Connect
terminal
No.3 and
battery (−)
terminal.1 − 4 Less than 2 ohms

IGNITION SYSTEM
ENGINE ELECTRICAL16-38
IGNITION COIL
REMOVAL AND INSTALLATION <4G1>M1163004000404
AC303965AB
11
5 2
2
10 ± 2 N·m
10 ± 2 N·m
25 ± 5 N·m
3
4
4
Removal steps
1. Ignition coil connector
2. Spark plug cable
3. Accelerator cable support clamp
4. Ignition coil
5. Spark plugRemoval steps (Continued)

IGNITION SYSTEM
ENGINE ELECTRICAL16-39
REMOVAL AND INSTALLATION <4G6>M1163004000415
AC301786
10 ± 2 N·m
25 ± 4 N·m
54
22
3 34
AB
1
3.0 ± 0.5 N·m
Removal steps
1. Rocker cover centre cover
2. Ignition coil connector
3. Spark plug cable4. Ignition coil
5. Spark plugRemoval steps (Continued)

IGNITION SYSTEM
ENGINE ELECTRICAL16-40
CAMSHAFT POSITION SENSOR
REMOVAL AND INSTALLATIONM1163003400443
AC303970AB
2
3
8.8 ± 1.0 N·m
N
1 <4G1>
AC301556
N
1 2
3
8.8 ± 1.0 N·m
AC
<4G6>
Removal steps
1. Camshaft position sensor
connector2. Camshaft position sensor
3. O-ringRemoval steps (Continued)