Mitsubishi Montero (2002-2004). Manual - part 692

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-465

STEP 13. Check the harness wires between PCM 
connector D-134 terminal 82 and fuel tank differential 
pressure sensor connector G-05 terminal 1 for damage. 
Q: Are the harness wires in good condition?

YES : It can be assumed that this malfunction is intermittent. 

(Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points 

− How to Cope with 

Intermittent Malfunction 

P.00-6

). Go to Step 15.

NO :  Repair the damaged harness wires. Go to Step 15.

AC203997

CONNECTOR: D-134

AC

D-134 (GR)

PCM

D-134 HARNESS CONNECTOR:
HARNESS SIDE

64

63

65 66 67 68

62

61

69 70 71 72 73

74 75 76 77 78 79 80 81 82
83 84

85 86 87

88 89

ACX00218

CONNECTOR : G-05

AR

G-05 (B)

SECOND SEAT UNDER
SERVICE HOLE

G-05 HARNESS
CONNECTOR:
COMPONENT SIDE

1

2

3

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-466

STEP 14. Using scan tool MB991502, check data list item 
73: Fuel Tank Differential Pressure Sensor.

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) Disconnect hose F from the evaporative emission canister 

side, and plug the hose.

(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
(5) Set scan tool MB991502 to the data reading mode for item 

73, Fuel Tank Differential Pressure Sensor.

• The fuel tank pressures reading on the scan tool should 

be 

−3.3 to 3.3 kPa (−0.97 to 0.97 inHg).

(6) Connect an evaporative emission system pressure pump to 

the fuel tank filler tube and pressurize the fuel tank.

• The fuel tank pressure reading should increase.

(7) Disconnect an evaporative emission system pressure pump 

and connect hose F.

(8) Turn the ignition switch to the "LOCK" (OFF) position and 

disconnect scan tool MB991502.

Q: Is the fuel tank pressure between 

−3.3 and 3.3 kPa (−

0.97 and 0.97 inHg)?
YES : It can be assumed that this malfunction is intermittent. 

(Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points 

− How to Cope with 

Intermittent Malfunction 

P.00-6

). Go to Step 15.

NO :  Replace the PCM. Go to Step 15.

STEP 15. Perform 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 1: Evaporative Emission Control system Leak 
Monitor) 

P.13Ab-2

].

(2) Read the diagnostic trouble code (DTC).
Q: Is DTC P0452 set?

YES : Go to Step 2.
NO :  The procedure is complete.

ACX01539

16-PIN

MB991502

AC

AC102602 AC

HOSE F

ACX01358

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-467

DTC P0453: Evaporative Emission System Pressure Sensor High Input

AC203991

SYSTEM DIAGRAM

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

Q

S

R

P

FUEL TANK

CHECK VALVE B

CHECK VALVE A

EVAPORATIVE
EMISSION
PURGE
SOLENOID

EVAPORATIVE EMISSION
VENTILATION SOLENOID

EVAPORATIVE
EMISSION
CANISTER

OVER VENT
VALVE MODULE

VENT PIPE
ASSEMBLY

AC

FUEL TANK DIFFERENTIAL
PRESSURE SENSOR

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-468

AC203992

Fuel Tank Differential Pressure Sensor Circuit

AB