Mitsubishi Montero (2002-2004). Manual - part 734

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-633

STEP 6. Check for open circuit and harness damage 
between accelerator pedal position sensor connector D-
138 (terminal No. 7) and PCM connector D-135 (terminal 
No. 96.)
Q: Is the harness wire in good condition?

YES : Go to Step 7.
NO :  Repair it. Then go to Step 8.

STEP 7. 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 8.

AK200945

3

4

5

1

2

8

6

7

AB

CONNECTOR: D-138

HARNESS 
CONNECTOR: 
COMPONENT SIDE

D-138(GR)

AK200947

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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-634

STEP 8. 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 P2128 set?

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

DTC P2135: Throttle Position Sensor (Main and Sub) Range/Performance Problem

.

Throttle Position Sensor (Main and Sub) Range/
Performance Problem Circuit

• Refer to, DTC P0122 − Throttle Position Sensor 

(Main) Circuit 

P.13Ac-81

.

• Refer to, DTC P0222 − Throttle Position Sensor 

(Sub) Circuit 

P.13Ac-330

.

.

CIRCUIT OPERATION

• Refer to, DTC P0122 − Throttle Position Sensor 

(Main) Circuit 

P.13Ac-81

.

• Refer to, DTC P0222 − Throttle Position Sensor 

(Sub) Circuit 

P.13Ac-330

.

.

TECHNICAL DESCRIPTION

• PCM checks the TPS output signal characteris-

tics for abnormal conditions.

.

DTC SET CONDITIONS

Check Conditions

• Ignition switch "ON" position.

• TPS (main) output voltage is higher than 0.35 

volts and lower than 2.5 volts.

• TPS (sub) output voltage is higher than 2.25 volts 

and lower than 4.8 volts.

Judgement Criteria

• Voltage obtained with the formula given below is 

0.3 volts or higher for 0.5 seconds: TPS (main) 
output voltage - [TPS (sub) output voltage - 2 
volts]

.

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

• TPS failed or maladjusted.

• Open or shorted TPS (Main) circuit, or loose con-

nector.

• PCM failed.

ACX01539

16-PIN

MB991502

AC

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-635

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Check connector B-05 at throttle position sensor 
for damage.
Q: Is the connector in good condition?

YES : Go to Step 2.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 7.

STEP 2. Check the throttle position sensor.
(1) Disconnect the connector B-05.

(2) Measure the resistance between throttle position sensor 

side  connector terminal No. 2 and No. 4.

Standard value: 2 

− 4 kiloohms

Q: Is the measured resistance between 2 and 4 kiloohms?

YES : Go to Step 3.
NO :  Replace the throttle body ASSY. Then go to Step 7.

AK201174

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6 5 4 3 2

B-05(B)

CONNECTOR: B-05

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AB

AK201174

1

6 5 4 3 2

B-05(B)

CONNECTOR: B-05

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AB

6

1 2 3 4 5

AK201512

THROTTLE POSITION
SENSOR SIDE 
CONNECTOR

AB

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-636

STEP 3. Check connector D-135 at PCM for damage.
Q: Is the 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 go to Step 7.

STEP 4. Check for short circuit to ground between throttle 
position sensor connector B-05 (terminal No. 1) and PCM 
connector D-135 (terminal No. 115).
Q: Is the harness wire in good condition?

YES : Go to Step 5.
NO :  Repair it.  Then go to Step 7.

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CONNECTOR: D-135

HARNESS CONNECTOR: 
COMPONENT SIDE

AB

PCM

D-135(GR)

AK201174

1

6 5 4 3 2

B-05(B)

CONNECTOR: B-05

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AB

AK200947

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CONNECTOR: D-135

HARNESS CONNECTOR: 
COMPONENT SIDE

AB

PCM

D-135(GR)