Mitsubishi Lancer Evolution 7. Manual — part 232
ENGINE ELECTRICAL -
Ignition System
16-27
IGNITION COIL SPECIFICATIONS
Items
Specifications
Type
Molded 2-coil
SPARK PLUG SPECIFICATIONS
Items
Specifications
NGK
IGR7A-G
DENSO
VW22PR-DA7
SERVICE SPECIFICATIONS
IGNITION COIL
Items
Standard value
Secondary coil resistance kΩ
8.5 - 11.5
SPARK PLUG
Items
Standard value
Limit
Spark plug gap mm
0.6 - 0.7
0.75
RESISTIVE CORD
Items
Limit
Resistance kΩ
max. 22
SPECIAL TOOL
Tool
Number
Name
Use
MD998773
Detonation sensor
wrench
Detonation sensor removal and installation
ENGINE ELECTRICAL -
Ignition System
16-28
ON-VEHICLE SERVICE
IGNITION COIL (WITH BUILT-IN POWER
TRANSISTOR) CHECK
Check by the following procedure, and replace if there is
a malfunction.
SECONDARY COIL RESISTANCE CHECK
Measure the resistance between the high-voltage terminals
of the ignition coil.
Standard value: 8.5 - 11.5 kΩ
PRIMARY COIL AND POWER TRANSISTOR
CONTINUITY CHECK
NOTE
1. An analogue-type circuit tester should be used.
2. Connect the negative (-) prove of the circuit tester to
terminal 1.
Caution
This test must be performed quickly (in less than 10
seconds) to prevent coil from burning and power
transistor from breakage.
1.5V power across 2-3
Continuity across 1-2
When energized
Yes
When not energized
No
RESISTIVE CORD CHECK
Measure the resistance of the all spark plug cables.
1. Check cap and coating for cracks.
2. Measure resistance.
Limit: Max. 22 kΩ
ENGINE ELECTRICAL -
Ignition System
16-29
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:
Maker
Model
Standard value (mm)
Limit value (mm)
NGK
IGR7A-G
0.6 - 0.7
0.75
DENSO
VW22PR-DA7
0.6 - 0.7
0.75
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 System
16-30
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.
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