Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual - part 365

 

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Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual - part 365

 

 

IGNITION SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-37

SPARK PLUG CHECK AND CLEANING 

M1163004300029

<2.4L ENGINE>

1. Check that the plug is not burned, that the insulator plug is 

not damaged, and that the seizure state is good.

2. If cleaning is required due to carbon deposits, etc., clean 

using a plug cleaner or wire brush, etc.

3. Check the plug gap using a plug gap gauge, and adjust if not 

within the standard value.

Standard value: 1.0 

 1.1 mm (0.039 

 0.043 inch)

SPARK PLUG CHECK AND CLEANING

M1163004300063

 <3.0L ENGINE>

CAUTION

Do not attempt to adjust the gap of the platinum plug.

Cleaning of the platinum plug may result in damage to 
the 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

M1163004400037

 <2.4L ENGINE>

Refer to GROUP 13A, Multiport fuel injection (MFI) diagnosis 

 

Diagnostic trouble code procedures 

 Camshaft position 

sensor circuit malfunction (

P.13A-191

).

CRANK ANGLE SENSOR CHECK

M1163004500034

<2.4L ENGINE>

Refer to GROUP 13A, Multiport fuel injection (MFI) diagnosis 

 

Diagnostic trouble code procedures 

 Crankshaft position 

sensor circuit malfunction (

P.13A-181

).

CRANK ANGLE SENSOR CHECK

M1163004500045

<3.0L ENGINE>

Refer to GROUP 13B, Multiport fuel injection (MFI) diagnosis 

 

Diagnostic trouble code procedures 

 Crankshaft position 

sensor circuit malfunction (

P.13B-248

).

AKX01272

AKX01272

PLUG GAP 
GAUGE

MEASU-
REMENT
DIRECTION

AB

AKX00383

AKX00383

BLUE LINES

PLATINUM 
TIPS

AE

IGNITION SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-38

IGNITION SECONDARY VOLTAGE WAVE 
PATTERN CHECK USING AN OSCILLOSCOPE

M1163001700073

<2.4L ENGINE>

MEASUREMENT METHOD
1. Clamp the spark plug cable (Number 1 or 3) 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 
carried out for the cylinder (Number 1 or 3) with the spark 
plug cable which has been clamped by the secondary 
pickup.

NOTE:  Identification of which cylinder wave pattern is 
displayed 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.

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

pickup.

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

STANDARD WAVE PATTERN

Observation Conditions 

FUNCTION

SECONDARY

Pattern height

High (or low)

Pattern selector

Raster

Engine speed

Curb idle speed

IGNITION SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-39

Observation Conditions 

Pattern selector

Display

Pattern height

High (or low)

Engine speed

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

AB

IGNITION SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-40

WAVEFORM OBSERVATION POINTS

NOTE:  Abnormal waveform examples are shown 
subsequently.
Point A: 

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

Point B: 

Number of vibrations 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)

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

AB

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

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

-

-

-

-

NUMBER OF VIBRATIONS

COIL AND CAPACITOR

Three or more

Normal

Except above

Abnormal

NUMBER OF VIBRATIONS

COIL

 6 or higher

Normal

Except above

Abnormal

 

 

 

 

 

 

 

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