Mitsubishi Eclipse. Manual — part 674
IGNITION SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-39
CAUTION
This test must be performed quickly (in less than 10 sec-
onds) to prevent coil from burning and ignition power tran-
sistor from breaking.
As described in the chart below, perform a continuity check on
the ignition coil power transistor. Replace the ignition power
transistor if there is a malfunction.
SPARK PLUG CABLE RESISTANCE CHECK
M1163001400094
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 TEST
M1163001500091
<3.0L ENGINE>
1. Remove the spark plug and connect to the spark plug cable.
2. Ground the spark plug outer electrode (body), and crank the
engine.
Check that there is an electrical discharge between the
electrodes at this time.
1.5 V POWER SUPPLY
BETWEEN 3
− 4
CONTINUITY BETWEEN
2
− 4
Current flowing
Yes
Current not flowing
No
AKX00382
AKX00432
SPARK PLUG
AB
AKX00277
DEFECTIVE INSULATION
DEFECTIVE INSULATION
DEFECTIVE
INSULATION
GOOD
AB
IGNITION SYSTEM
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ENGINE ELECTRICAL
16-40
SPARK PLUG CHECK AND CLEANING
M1163004300320
<3.0L ENGINE>
CAUTION
• Do not attempt to adjust the gap of the iridium plug.
• Cleaning of the iridium plug may result in damage to
the iridium tip. 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: 0.7
− 0.8 mm (0.028 − 0.031 inch)
Limit: 1.0 mm (0.039 inch)
CAMSHAFT POSITION SENSOR CHECK
M1163004400189
<2.4L ENGINE>
Refer to GROUP 13A, Multiport Fuel Injection (MFI) <2.4L>
−
Multiport Fuel Injection (MFI) Diagnosis
− Diagnostic Trouble
Code Procedures
− Camshaft Position Sensor Circuit Malfunc-
tion
.
CRANKSHAFT POSITION SENSOR CHECK
M1163004500238
<2.4L ENGINE>
Refer to GROUP 13A, Multiport Fuel Injection (MFI) <2.4L>
−
Multiport Fuel Injection (MFI) Diagnosis
− Diagnostic Trouble
Code Procedures
− DTC P0335 : Crankshaft Position Sensor
Circuit
CRANKSHAFT POSITION SENSOR CHECK
M1163004500249
<3.0L ENGINE>
Refer to GROUP 13B, Multiport Fuel Injection (MFI) <3.0L>
−
Multiport Fuel Injection (MFI) Diagnosis
− Diagnostic Trouble
Code Procedures
− DTC P0335 : Crankshaft Position Sensor
Circuit
IGNITION SECONDARY VOLTAGE WAVE
PATTERN CHECK USING AN OSCILLOSCOPE
M1163001700192
<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 car-
ried out for the cylinder (Number 1 or 3) with the spark plug
cable which has been clamped by the secondary pickup.
AKX00383
AKX00383
IRIDIUM TIP
AK
IGNITION SYSTEM
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ENGINE ELECTRICAL
16-41
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.
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
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
16-42
.
WAVEFORM OBSERVATION POINTS
NOTE: Abnormal waveform examples are shown subse-
quently.
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.
Point B:
Number of vibrations in reduction vibration section (Refer to
Abnormal Waveform Example 5)
Point C:
Observation Conditions
Pattern selector
Display
Pattern height
High (or low)
Engine speed
Curb idle speed
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
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