Mitsubishi Lancer Evolution IX. Manual — part 353

AC311403 AB

Relay
side

IGNITION SYSTEM

ENGINE ELECTRICAL

16-29

2. Use the jumper leads to connect ignition coil relay

terminal 3 to the negative battery terminal and
terminal 2 to the positive battery terminal.

3. Check the continuity between ignition coil relay

connector terminals 1 and 4 while alternately
connecting and disconnecting the jumper leads
from the battery terminals.

Jumper leads

Continuity between
terminals 1 and 4

Connected

Less than 2

Ω

Disconnected

Open circuit

4. If there is a malfunction, replace the ignition coil

relay.

SPARK PLUG CABLE CHECK

M1163001400157

AKX00382

Measure the resistance of the all spark plug cables.
1. Check cap and coating for cracks.
2. Measure resistance.

Limit: Maximum 19 k

Ω

SPARK PLUG CHECK AND CLEANING

M1163004300728

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 and ignition coils.
2. Remove the spark plugs.

CAUTION

• Do not attempt to adjust the gap of the iridium

plug.

•

AK501797AB

Iridium tip

Platinum tip

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: 0.5

− 0.6mm

Limit: 0.75 mm

IGNITION SYSTEM

ENGINE ELECTRICAL

16-30

CAUTION

Be careful not to allow foreign matter in cylin-
ders.
4. Clean the engine plug holes.

5. Install the spark plugs.
6. Install the spark plug cables and ignition coils.

CAMSHAFT POSITION SENSOR CHECK

M1163004400305

Check the camshaft position sensor system if
self-diagnosis code, No. P0340 is shown.

(Refer to GROUP 13A

− Troubleshooting − Inspec-

tion procedure for diagnosis code

P.13A-166

.)

CRANK ANGLE SENSOR CHECK

M1163004500368

Check the crank angle sensor system if self-diagno-
sis code, No. P0335 is shown.

(Refer to GROUP 13A

− Troubleshooting − Inspec-

tion procedure for diagnosis code

P.13A-155

.)

DETONATION SENSOR CHECK

M1163002900070

Check the detonation sensor system if self-diagnosis
code, No. P0325 is shown.

(Refer to GROUP 13A

− Troubleshooting − Inspec-

tion procedure for diagnosis code

P.13A-151

.)

IGNITION SECONDARY VOLTAGE WAVEFORM CHECK USING AN OSCILLOSCOPE

M1163001700288

MEASUREMENT METHOD

1. Clamp the spark plug cable (No. 1 cylinder or No.

3 cylinder) with the secondary pickup.
NOTE:

.

•

Because of the two-cylinder simultaneous igni-
tion system, the waveforms for two cylinders in
each group appear during waveform observa-
tion (No. 1 cylinder - No. 4 cylinder, No. 2 cyl-
inder - No. 3 cylinder). However, waveform
observation is only applicable for the cylinder
with the spark plug cable clamped by the sec-
ondary pickup.

•

Identifying which cylinder waveform is dis-
played can be difficult. For reference, remem-
ber 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.

IGNITION SYSTEM

ENGINE ELECTRICAL

16-31

STANDARD WAVEFORM

Observation Conditions

Function

Secondary

Pattern height

High (or Low)

Pattern selector

Raster

Engine revolutions

Curb idle speed

AKX00278

kV

0

Secondary

ignition voltage

wave pattern

Ignition voltage
(point D)

Spark line (point A)

Dwell section

Wave damping reduction section (point B)

Point C

Time

AC

IGNITION SYSTEM

ENGINE ELECTRICAL

16-32

Observation Conditions (The only change from above condition is the pattern selector.)

Pattern selector

Display

AKX01275

kV

Secondary ignition
voltage wave pattern

0

2

NO. 1 cylinder

NO. 3 cylinder
ignition noise

Neutral section

NO. 4 cylinder

NO. 2 cylinder
ignition noise

Time

AD

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 line

Plug gap Condition of

electrode

Compression
force

Concentration
of air mixture

Ignition
timing

Spark 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 −

−

−

−

Point B: Number of vibration in reduction vibration section (Refer to abnormal waveform example 5)

Number of vibrations

Coil and condenser

3 or more

Normal

Except above

Abnormal

Point C: Number of vibrations at beginning of dwell section (Refer to abnormal waveform example 5)

Number of vibrations

Coil

5

− 6 or higher

Normal

Except above

Abnormal

Point D: Ignition voltage height (distribution per each cylinder) shows the following trends.

Ignition
voltage

Plug gap

Condition of
electrode

Compression
force

Concentration
of air mixture

Ignition
timing

Spark plug
cable

High

Large

Large wear

High

Lean

Retarded

High
resistance

Low

Small

Normal

Low

Rich

Advanced

Leak