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

TSB Revision

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

TSB Revision

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