Mitsubishi Montero (2002-2004). Manual — part 740

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SYMPTOM PROCEDURES

13Ad-9

.

CIRCUIT OPERATION

• The malfunction indicator lamp (service engine

soon or check engine lamp) power is supplied
from the ignition switch.

• The PCM controls the ground of the malfunction

indicator lamp (service engine soon or check
engine lamp) by turning the power transistor in
the PCM ON and OFF.

.

COMMENT

• The PCM causes the malfunction indicator lamp

(service engine soon or check engine lamp) to
illuminate for 20 seconds immediately after the
ignition switch is turned to the "ON" position
occurred.

.

AK201042AD

D-03(GR)

CONNECTOR: D-03

AK201038

CONNECTOR: D-132

AB

PCM

D-132(GR)

AK201045

D-204

AB

CONNECTOR: D-204

AK201041AC

CONNECTOR: D-210

D-210

AK201042AE

CONNECTOR: D-04

D-04(GR)

AK201041AD

CONNECTOR: D-208

D-208

AK201043

E-111

AB

CONNECTOR: E-111

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SYMPTOM PROCEDURES

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TROUBLESHOOTING HINTS (The most likely
causes for this case: )

• Burnt-out bulb.

• Defective malfunction indicator lamp (service

engine soon or check engine lamp) circuit.

• Malfunction of the PCM.

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check data list item 16:
Power Supply Voltage.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to the data reading mode for item

16, Power Supply Voltage.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to Step 2.
NO : Refer to INSPECTION PROCEDURE 28

− Power

Supply System and Ignition Switch-IG System

P.13Ad-75

.

STEP 2. Check the burned-out bulb.
Q: Is the valve normal?

YES : Go to step 3.
NO : Replace the bulb. Then confirm that the malfunction

symptom is eliminated.

ACX01539

16-PIN

MB991502

AC

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SYMPTOM PROCEDURES

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STEP 3. Check harness connector D-03, D-04 at the
combination meter for damage.
Q: Is the harness connector in good condition?

YES : Go to step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

AK201287

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52

53

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59

56

57

58

60

61

62

63

64

65

66

67

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: D-03

D-03(GR)

AK200978

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43

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42

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45

46

32 31

33

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35

36

AB

D-04(GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: D-04

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SYMPTOM PROCEDURES

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STEP 4. Measure the power supply voltage at combination
meter harness side connector D-03.
(1) Disconnect the connector D-03 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 62 and ground.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to Step 5.
NO : Check harness connectors D-210 and D-208 at

intermediate connector for damage, and repair or
replace as required. Refer to GROUP 00E, Harness
Connector Inspection

P.00E-2

. If intermediate

connectors D-210 and D-208 are in good condition,
repair it because of open circuit between ignition
switch connector D-204 (terminal No. 2) and
combination meter connector D-03 (terminal No. 62).
Then confirm that the malfunction symptom is
eliminated.

STEP 5. Check harness connector D-132 at the PCM for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

AK201287

51

52

53

54

55

59

56

57

58

60

61

62

63

64

65

66

67

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: D-03

D-03(GR)

AKX01503

D-03 HARNESS
CONNECTOR:
COMPONENT SIDE

AC

5857 565554

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AK200938

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9

1

10

14

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16

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27

11

12

13

AB

CONNECTOR: D-132

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-132(GR)