Mitsubishi Montero (2002-2004). Manual — part 1089
IGNITION SYSTEM
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ENGINE ELECTRICAL
16-29
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.
IGNITION COIL CHECK
M1163001200153
Check by the following procedure, and replace the coil if there
is a malfunction.
.
SECONDARY COIL RESISTANCE CHECK
Measure the resistance between the high-voltage terminals of
the ignition coil.
Standard value: 8.5
− 11.5 kΩ
.
PRIMARY COIL AND IGNITION POWER TRANSISTOR
CONTINUITY CHECK
NOTE: An analog-type ohmmeter should be used.
NOTE: Connect the negative probe of the ohmmeter to termi-
nal 1.
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.
1. Connect and disconnect 1.5 V battery between terminals 2
and 3, and observe the ohmmeter whether there is
continuity or not.
2. If results do not agree with the table below, replace the
primary coil and ignition power transistor assembly.
AKX00277
DEFECTIVE INSULATION
DEFECTIVE INSULATION
DEFECTIVE
INSULATION
GOOD
AB
AKX01264
1.5 V POWER SUPPLY
BETWEEN 2
− 3
CONTINUITY BETWEEN
1
− 2
Current flowing
Yes
Current not flowing
No
AKX01265AB
1.5 V
1 2 3
+
–
IGNITION SYSTEM
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ENGINE ELECTRICAL
16-30
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
M1163004300212
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: 0.7
− 0.8 mm (0.028 − 0.031 inch)
Limit: 1.0 mm (0.039 inch)
CAMSHAFT POSITION SENSOR AND
CRANKSHAFT POSITION SENSOR CHECK
M1163002600110
Refer to GROUP 13A, Diagnostic Trouble Code Procedures
−
DTC P0335: Crankshaft Position Sensor Circuit
Refer to GROUP 13A, Diagnostic Trouble Code Procedures
−
DTC P0340: Camshaft Position Sensor Circuit
IGNITION SECONDARY VOLTAGE WAVE
PATTERN CHECK USING A OSCILLOSCOPE
M1163001700028
.
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.
AKX00382
AKX01327AB
IRIDIUM
TIP
PLATINUM
TIP
IGNITION SYSTEM
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ENGINE ELECTRICAL
16-31
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
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
16-32
.
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
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