Mitsubishi Montero Sport (2004+). Manual — part 98

IGNITION SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-33

Number 3 and Number 6 cylinder side coil

Replace the ignition power transistor if there is a malfunction.

SPARK PLUG CABLE RESISTANCE CHECK

M1163001400083

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

Limit: 19 k

Ω

SPARK PLUG CHECK AND CLEANING

M1163004300115

CAUTION

• Do not attempt to adjust the gap of the iridium plug.
• Cleaning of the iridium plug may result in damage to

the iridium and platinum tips. Therefore, if carbon
deposits must be removed, use a plug cleaner and
complete cleaning within 20 seconds to protect the
electrode. Do not use a wire brush.

Check the plug gap and replace if the limit is exceeded.

Standard value: 1.0

− 1.1 mm (0.039 − 0.043 inch)

Limit: 1.3 mm (0.051 inch)

CAMSHAFT POSITION SENSOR CHECK

M1163004400253

Refer to GROUP 13A, Multiport Fuel Injection (MFI)

− Multiport

Fuel Injection (MFI) Diagnosis

− Diagnostic Trouble Code Pro-

cedures

− DTC P0340 : Camshaft Position Sensor Circuit

P.13A-468

.

CRANKSHAFT POSITION SENSOR CHECK

M1163004500313

Refer to GROUP 13A, Multiport Fuel Injection (MFI)

− Multiport

Fuel Injection (MFI) Diagnosis

− Diagnostic Trouble Code Pro-

cedures

− DTC P0335 : Crankshaft Position Sensor Circuit

P.13A-452

.

1.5 V POWER SUPPLY
BETWEEN 1

− 4

CONTINUITY BETWEEN
4

− 11

Current flowing

Yes

Current not flowing

No

AKX00276

11 12 13

1 2 3 4 5 6

1.5 V

+

+

-

-

AB

AKX00382

AKX01327AB

IRIDIUM
TIP

PLATINUM
TIP

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-34

IGNITION SECONDARY VOLTAGE WAVE
PATTERN CHECK USING AN OSCILLOSCOPE

M1163001700222

.

MEASUREMENT METHOD
1. Clamp the spark plug cable (Number 1, 3 or 5) with the

secondary pickup.
NOTE: Because of the two-cylinder simultaneous ignition
system, the waves for two cylinders in each group appear
during wave observation. However, wave observation is car-
ried out for the cylinder (Number 1, 3 or 5) with the spark
plug cable which has been clamped by the secondary
pickup.
NOTE: Identification of which cylinder wave pattern is dis-
played can be difficult, but the wave pattern of the cylinder
which is clamped by the secondary pickup will be stable, so
this can be used as a reference for identification.

2. Clamp the spark plug cable (Number 1, 3 or 5) with the

trigger pickup.
NOTE: Clamp the same spark plug cable as the one which
has been clamped by the secondary pickup.

.

STANDARD WAVEPATTERN

Observation Conditions

FUNCTION

SECONDARY

Pattern height

High (or low)

Pattern selector

Raster

Engine revolutions

Curb idle speed

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-35

Observation Conditions (Only pattern selector below
changes from the above conditions.)

Pattern selector

Display

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

AB

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-36

.

WAVEFORM OBSERVATION POINTS
Point A:

The height, length and slope of the spark line (refer to
abnormal waveform examples 1, 2, 3 and 4) show the fol-
lowing trends.

SPARK LINE

PLUG GAP STATUS OF

ELECTRODES

COMPRESSION
FORCE

CONCENTRATION
OF AIR MIXTURE

IGNITION
TIMING

SPARK PLUG
CABLE

Length Long

Small

Normal

Low

Rich

Advanced

Leak

Length Short Large

Large wear

High

Lean

Retarded

High
resistance

Height High

Large

Large wear

High

Lean

Retarded

High
resistance

Height Low

Small

Normal

Low

Rich

Advanced

Leak

Slope

Large

Plug is fouled −

−

−

−

AKX00279

kV

0

SECONDARY
IGNITION
VOLTAGE
WAVE PATTERN

TIME

NO.1 CYLINDER

NO.3 CYLINDER
IGNITION NOISE

NO.6 CYLINDER
IGNITION NOISE

NEUTRAL
SECTION

NO.4 CYLINDER
(WAVE PATTERN
IS DISTURBED)

NO.2 CYLINDER
IGNITION NOISE

NO.5 CYLINDER
IGNITION NOISE

AB