Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 367
IGNITION SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-45
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 wave pattern example 1.
•
Cause of problem
Spark plug cable is not properly connected. (Causing a dual
ignition)
Example 5
•
Wave characteristics
No waves in wave damping section
•
Cause of problem
Layer short in ignition coil.
IGNITION PRIMARY VOLTAGE WAVE PATTERN
CHECK
M1163004600020
<3.0L ENGINE>
MEASUREMENT METHOD
1. Disconnect the distributor connector and connect special
tool (Test harness: MB991348) in between. (All of the
terminals should be connected.)
2. Connect the analyzer primary pickup to the distributor
connector terminal 2.
3. Connect the primary pickup ground terminal.
4. Clamp the spark plug cable with the trigger pickup.
NOTE: The wave pattern of the cylinder clamped to the
trigger pickup will appear at the left edge of the screen.
AKX00282
AKX00283
AKX00284
AKX01282
OSCILLOSCOPE
PRIMARY
PICKUP
GROUND
1 2 3 4 5 6 7
AB
IGNITION SYSTEM
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ENGINE ELECTRICAL
16-46
STANDARD WAVE PATTERN
OBSERVATION CONDITIONS
FUNCTION
SECONDARY
Pattern height
High (or low)
Pattern selector
Raster
Engine speed
Curb idle speed
OBSERVATION CONDITIONS
Pattern selector
Display
Pattern height
High (or low)
Engine speed
Curb idle speed
AKX00286
PRIMARY
VOLTAGE
WAVE PATTERN
(V)
100
0
ZENER
VOLTAGE
(POINT C)
(APPROXIMATELY
40
~
10V)
DWELL SECTION
SPARK LINE
(POINT A)
WAVE DAMEPING REDUCTION
SECTION(POINT B)
TIME
AB
IGNITION SYSTEM
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ENGINE ELECTRICAL
16-47
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:
Height of Zener voltage
AKX01284
(V)
10
0
IGNITION PRIMARY
VOLTAGE
WAVE PATTERN
CENTER
SECTION
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, CAPACITOR
Three or higher
Except above
Normal
Abnormal
IGNITION SYSTEM
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ENGINE ELECTRICAL
16-48
ABNORMAL WAVEFORMS EXAMPLES
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
•
Cause of problem
Spark plug cable is not properly connected. (Causing a
dual ignition)
HEIGHT OF ZENER
VOLTAGE
PROBABLE CAUSE
High
Problem in zener diode
Low
Abnormal resistance in
primary coil circuit
AKX00288
AKX00289
AKX00290
AKX00291
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