Mitsubishi Montero (2002-2004). Manual - part 732

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-625

STEP 8. Check connector D-135 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 9.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

STEP 9. Check for harness damage between accelerator 
pedal position sensor connector D-138 (terminal No. 8) and 
PCM connector D-135 (terminal No. 97).
Q: Is the harness wire in good condition?

YES : Go to Step 10.
NO :  Repair it. Then go to Step 12.

AK200947

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CONNECTOR: D-135

HARNESS CONNECTOR: 
COMPONENT SIDE

AB

PCM

D-135(GR)

AK200945

3

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1

2

8

6

7

AB

CONNECTOR: D-138

HARNESS 
CONNECTOR: 
COMPONENT SIDE

D-138(GR)

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CONNECTOR: D-135

HARNESS CONNECTOR: 
COMPONENT SIDE

AB

PCM

D-135(GR)

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-626

STEP 10. Check for harness damage between accelerator 
pedal position sensor connector D-138 (terminal No. 6) and 
PCM connector D-135 (terminal No. 107)
Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO :  Repair it. Then go to Step 12.

STEP 11. Using scan tool MB991502, check data list item 
77: Accelerator Pedal Position Sensor (sub).

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 77, Accelerator Pedal Position Sensor (sub).

• Output voltage is between 0.905 and 1.165 volts when 

foot is released from accelerator pedal.

• Output voltage is 4.035 volts or higher when accelerator 

pedal is fully depressed.

(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the sensor operating properly?

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

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

P.00-6

.

NO :  Replace the PCM. Then go to Step 12.

AK200945

3

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AB

CONNECTOR: D-138

HARNESS 
CONNECTOR: 
COMPONENT SIDE

D-138(GR)

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CONNECTOR: D-135

HARNESS CONNECTOR: 
COMPONENT SIDE

AB

PCM

D-135(GR)

ACX01539

16-PIN

MB991502

AC

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-627

STEP 12. Using scan tool MB991502, read the diagnostic 
trouble code (DTC).
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is DTC P2127 set?

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

ACX01539

16-PIN

MB991502

AC

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-628

DTC P2128: Accelerator Pedal Position Sensor (Sub) Circuit High Input

.

CIRCUIT OPERATION

• A 5-volt power supply is applied on the APS (sub) 

power terminal (terminal No. 8) from the PCM 
(terminal No. 97).
The ground terminal (terminal No. 7) is grounded 
with PCM (terminal No. 96).

• When the accelerator pedal is moved from the 

idle position to the fully opened position, the 
resister between the APS (sub) output terminal 
(terminal No. 6) and ground terminal will increase 
according to the rotation.

AK201164

GREEN-YELLO

W

GREEN-ORANGE

BLA

CK

5 V

97

8

ACCELERATOR 
PEDAL 

POSITION
SENSOR
(SUB)

POWERTRAIN CONTROL MODULE (PCM)

107

96

6

7

Accelerator Pedal Position Sensor (Sub) Circuit

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

D-135

(MU803805)

D-138 

(MU802073)

6 7 8

1 2 3 4 5

AK200944

ACCELERATOR
PEDAL 
POSITION 
SENSOR

AB

D-138(GR)

CONNECTOR: D-138

AK201038AF

CONNECTOR: D-135

PCM

D-135(GR)