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

TSB Revision

SYMPTOM PROCEDURES

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.

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

TSB Revision

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

TSB Revision

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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59

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58

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62

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67

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: D-03

D-03(GR)

AK200978

37

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43

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44

47

45

46

32 31

33

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36

AB

D-04(GR)

HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: D-04

TSB Revision

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

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59

56

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62

63

64

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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

2

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1

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14

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AB

CONNECTOR: D-132

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-132(GR)