Mitsubishi Montero (2002-2004). Manual — part 573
CHECK AT THE POWERTRAIN CONTROL MODULE (PCM)
TSB Revision
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
13Ab-49
23
− 34
Evaporative emission purge solenoid
30
− 34 Ω [at 20°C (68°F)]
11
− 34
Evaporative emission ventilation solenoid
17
− 21 Ω [at 20°C (68°F)]
33
− Body
ground
PCM ground
Continuity (0
Ω)
42
− Body
ground
PCM ground
144
− Body
ground
PCM ground
145
− Body
ground
PCM ground
98
− 96
Engine coolant temperature sensor
14
− 17 kΩ [when engine coolant temperature
is
−20°C (−4°F)]
5.1
− 6.5 kΩ [when engine coolant temperature
is 0
°C (32°F)]
2.1
− 2.7 kΩ [when engine coolant temperature
is 20
°C (68°F)]
0.9
− 1.3 kΩ [when engine coolant temperature
is 40
°C (104°F)]
0.48
− 0.68 kΩ [when engine coolant
temperature is 60
°C (140°F)]
0.26
− 0.36 kΩ [when engine coolant
temperature is 80
°C (176°F)]
99
− 88
Intake air temperature sensor
13
− 17 kΩ [when intake air temperature is −
20
°C (−4°F)]
5.3
− 6.7 kΩ [when intake air temperature is
0
°C (32°F)]
2.3
− 3.0 kΩ [when intake air temperature is
20
°C (68°F)]
1.0
− 1.5 kΩ [when intake air temperature is
40
°C (104°F)]
0.56
− 0.76 kΩ [when intake air temperature is
60
°C (140°F)]
0.30
− 0.42 kΩ [when intake air temperature is
80
°C (176°F)]
133
− 141
Throttle actuator control motor
0.3
− 100 Ω [at 20°C (68°F)]
TERMINAL
NO.
INSPECTION ITEM
NORMAL CONDITION (INSPECTION
CONDITION)
INSPECTION PROCEDURE USING AN OSCILLOSCOPE
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
13Ab-50
INSPECTION PROCEDURE USING AN OSCILLOSCOPE
M1131154500338
VOLUME AIRFLOW SENSOR
Required Special Tool:
• MB991709: Test Harness
.
Measurement Method
1. Disconnect the volume airflow sensor connector, and
connect the test harness special tool (MB991709) in
between. (All terminals should be connected.)
2. Connect the oscilloscope probe to volume airflow sensor
connector terminal No. 3.
.
Alternate method (Test harness not available)
1. Connect the oscilloscope probe to PCM terminal No. 63.
Standard Wave Pattern
Observation condition
Function
Special pattern
Pattern height
Low
Pattern selector
Display
Engine r/min
Idle speed
Observation condition
Rev engine, observe T1 and T2 remain equal.
AK102975AB
1 2 3 4 5 6 7
AIR FLOW SENSOR
CONNECTOR
OSCILLOSCOPE
MB991709
AKX01595
THE TIME (CYCLE TIME) T IS REDUCED WHEN THE
AMOUNT OF INTAKE AIR INCREASES.
TIMES T
1
AND T
2
ARE EQUAL
T
T
1
T
2
10
0
(V)
TIME
AB
Standard wave pattern
INSPECTION PROCEDURE USING AN OSCILLOSCOPE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
13Ab-51
Wave Pattern Observation Points
1. Check that cycle time T becomes shorter and the frequency
increases when the engine speed is increased.
.
Examples of Abnormal Wave Patterns
Example 1
Cause of problem
• Sensor interface malfunction.
Wave pattern characteristics
• Rectangular wave pattern is output even when the
engine is not started.
Example 2
Cause of problem
• Damaged rectifier or vortex generation column.
Wave pattern characteristics
• Unstable wave pattern with non-uniform frequency. An
ignition leak will distort the wave pattern temporarily,
even if the volume airflow sensor is normal.
AKX01596
10
0
(V)
T
TIME
AB
Standard wave pattern
AKX01597
INSPECTION PROCEDURE USING AN OSCILLOSCOPE
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
13Ab-52
CAMSHAFT POSITION SENSOR AND
CRANKSHAFT POSITION SENSOR
Required Special Tools:
• MB991348: Test Harness
• MD998478: Test Harness
.
Measurement Method
1. Disconnect the camshaft position sensor intermediate
connector, and connect the test harness special tool
(MB991348) in between. (All terminals should be
connected.)
2. Connect the oscilloscope probe to camshaft position sensor
intermediate connector terminal No. 2.
3. Disconnect the crankshaft position sensor connector, and
connect the test harness special tool (MD998478) in
between.
4. Connect the oscilloscope probe to crankshaft position
sensor connector terminal No. 2 (black clip of special tool).
.
Alternate method (Test harness not available)
1. Connect the oscilloscope probe to PCM terminal No. 71.
(Check the camshaft position sensor signal wave pattern.)
2. Connect the oscilloscope probe to PCM terminal No. 70.
(Check the crankshaft position sensor signal wave pattern.)
Standard Wave Pattern
Observation condition
Function
Special pattern
Pattern height
Low
Pattern selector
Display
Engine r/min
Idle speed
AK102978AB
1 2 3
OSCILLOSCOPE
MB991348
CAMSHAFT POSITION
SENSOR INTERMEDIATE
CONNECTOR
AK102979AB
MD998478
1 2
3
CRANKSHAFT POSITION
SENSOR CONNECTOR
OSCILLOSCOPE
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