Mitsubishi Montero (2002-2004). Manual - part 672

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-385

STEP 14. Check for open circuit and harness damage 
between camshaft position sensor connector B-10 
(terminal No. 1) and PCM connector D-134 (terminal No. 
88).
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 20.
NO :  Repair it. Then go to Step 20.

STEP 15. Check connector B-22X at the MFI relay for 
damage.
Q: Is the connector in good condition?

YES : Go to Step 16.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 20.

AK200965

1

2

3

AB

B-10(B)

CONNECTOR: B-10

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AK201166

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CONNECTOR: D-134

AB

PCM

D-134(GR)

HARNESS CONNECTOR: 
COMPONENT SIDE

AK200951

2 1

3

4

B-22X

AB

CONNECTOR: B-22X

HARNESS 
CONNECTOR: 
COMPONENT SIDE

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-386

STEP 16. Check connector D-134 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 17.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 20.

STEP 17. Check for harness damage between MFI relay 
connector B-22X (terminal No. 1) and camshaft position 
sensor connector B-10 (terminal No. 3).
Q: Is the harness wire in good condition?

YES : Go to Step 18.
NO :  Repair it. Then go to Step 20.

AK201166

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62

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CONNECTOR: D-134

AB

PCM

D-134(GR)

HARNESS CONNECTOR: 
COMPONENT SIDE

AK200951

2 1

3

4

B-22X

AB

CONNECTOR: B-22X

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AK200965

1

2

3

AB

B-10(B)

CONNECTOR: B-10

HARNESS 
CONNECTOR: 
COMPONENT SIDE

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-387

STEP 18. Check for harness damage between camshaft 
position sensor connector B-10 (terminal No. 2) and PCM 
connector D-134 (terminal No. 70).
Q: Is the harness wire in good condition?

YES : Go to Step 19.
NO :  Repair it. Then go to Step 20.

STEP 19. Check the camshaft position sensing cylinder.
Q: Is the camshaft position sensing cylinder in a good 

condition?
YES : Replace the camshaft position sensor. Then go to 

Step 20.

NO :  Repair it. Then go to Step 20.

STEP 20. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

GROUP 13A, Trouble Code Diagnosis 

− OBD-II Drive Cycle 

− Procedure 6 − Other Monitor 

P.13Ab-2

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0340 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

AK200965

1

2

3

AB

B-10(B)

CONNECTOR: B-10

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AK201166

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62

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66

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69

70

71

76

77

78

79

85

86

87

80

72

73

74

75

81

82

83

84

88

89

CONNECTOR: D-134

AB

PCM

D-134(GR)

HARNESS CONNECTOR: 
COMPONENT SIDE

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-388

DTC P0401: Exhaust Gas Recirculation Flow Insufficient Detected

.

TECHNICAL DESCRIPTION

• When the EGR valve (stepper motor) is actuated 

from the fully closed position toward the open 
position while the engine is running, EGR gas 
flows.

• The PCM checks how the EGR gas flow signal 

changes.

.

DTC SET CONDITIONS

Check Conditions

• At least 20 seconds have passed since the last 

monitor was complete.

• Engine coolant temperature is higher than 76°C 

(169

°F).

• Engine speed is at between 910 and 1,650 r/min.

• Intake air temperature is higher than 0°C (32°F).

• Barometric pressure is higher than 76 kPa (11 

psi).

• Vehicle speed is 30 km/h (18.7 mph) or more.

• At least 90 seconds have passed since manifold 

differential pressure sensor output voltage fluctu-
ated 1.5 volts or more.

• The throttle valve is closed.

• Volumetric efficiency is lower than 28 percent.

• The PCM monitors for this condition for 3 cycles 

of 2 seconds each during the drive cycle.

Judgement Criteria

• When the EGR valve opens to the prescribed 

opening, when intake manifold pressure fluctua-
tion width is lower than 2.6 kPa (0.37 psi).

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are: )

• Dirtiness of the EGR valve and EGR passage.

• EGR valve (stopper motor) failed.

• Open or shorted EGR valve (stopper motor) cir-

cuit, or loose connector.

• Manifold differential pressure sensor failed.

• PCM failed.

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Check the EGR system
Refer to GROUP 17, Emission Control System 

− Exhaust Gas 

Recirculation (EGR) System 

− General Information 

P.17-63

.

Q: Are there any abnormalities?

YES : Go to Step 2.
NO :  Repair it. Then go to Step 3.