Mitsubishi Montero (2002-2004). Manual — part 735

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-637

STEP 5. Check for short circuit to ground between throttle
position sensor connector B-05 (terminal No. 3) and PCM
connector D-135 (terminal No. 113).
Q: Is the harness wire in good condition?

YES : Go to Step 6.
NO : Repair it. Then go to Step 7.

STEP 6. Using scan tool MB991502, read the diagnostic
trouble code (DTC).

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) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is DTC P2135 set?

YES : Replace the PCM. Then go to Step 7.
NO : It can be assumed that this malfunction is intermittent.

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

P.00-6

.

AK201174

1

6 5 4 3 2

B-05(B)

CONNECTOR: B-05

HARNESS
CONNECTOR:
COMPONENT SIDE

AB

AK200947

91

92

93

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95

96

97

98

99

100

101

102

103

104

105

106

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108

109

110

111

112

113

114

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116

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118

119

120

CONNECTOR: D-135

HARNESS CONNECTOR:
COMPONENT SIDE

AB

PCM

D-135(GR)

ACX01539

16-PIN

MB991502

AC

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-638

STEP 7. 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 P2135 set?

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

DTC P2138: Accelerator Pedal Position Sensor (Main and Sub) Circuit Range/Performance Problem

.

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

• Refer to, DTC P2122 − Accelerator Pedal Posi-

tion Sensor (Main) Circuit

P.13Ac-600

.

• Refer to, DTC P2127 − Accelerator Pedal Posi-

tion Sensor (Sub) Circuit

P.13Ac-619

.

.

CIRCUIT OPERATION

• Refer to, DTC P2122 − Accelerator Pedal Posi-

tion Sensor (Main) Circuit

P.13Ac-600

.

• Refer to, DTC P2127 − Accelerator Pedal Posi-

tion Sensor (Sub) Circuit

P.13Ac-619

.

.

TECHNICAL DESCRIPTION

• PCM checks the APS output signal characteris-

tics for abnormal conditions.

.

DTC SET CONDITIONS

Check Condition

• Ignition switch "ON" position.

• APS (main) output voltage is higher than 0.5 volts

and lower than 4.5 volts.

• APS (sub) output voltage is higher than 0.5 volts

and lower than 4.5 volts.

Judgement Criteria

• APS (sub) output voltage minus APS (main) out-

put voltage should be 1 volt or higher for 1 sec-
ond.

• APS (main) output voltage minus APS (sub) out-

put voltage should be 1 volt or higher for 0.2 sec-
onds.

.

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

• APS failed or maladjusted.

• Open or shorted APS circuit, or loose connector.

• PCM failed.

ACX01539

16-PIN

MB991502

AC

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-639

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Check connector D-138 at accelerator pedal
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 17.

STEP 2. Check the accelerator pedal position sensor.
(1) Disconnect the accelerator pedal position sensor connector

D-138.

(2) Measure resistance between terminal No.1 and No. 2 and

between terminal No. 7 and No. 8.

Standard value: 3.5

− 6.5 kiloohms

(3) Measure resistance between terminal No. 2 and No. 3 and

between terminal No. 6 and No. 8.

(4) Move the accelerator pedal from the idle position to the full-

open position.

• Resistance value changes in accordance with the accel-

erator pedal depression smoothly.

Q: Is the resistance normal?

YES : Go to Step 3.
NO : Replace the accelerator pedal position sensor. Then

go to Step 17.

AK200945

3

4

5

1

2

8

6

7

AB

CONNECTOR: D-138

HARNESS
CONNECTOR:
COMPONENT SIDE

D-138(GR)

AK200945

3

4

5

1

2

8

6

7

AB

CONNECTOR: D-138

HARNESS
CONNECTOR:
COMPONENT SIDE

D-138(GR)

6 7 8

1 2 3 4 5

AK201450

ACCELERATOR PEDAL
POSITION SENSOR
SIDE CONNECTOR

AB

6 7 8

1 2 3 4 5

AK201451

ACCELERATOR PEDAL
POSITION SENSOR
SIDE CONNECTOR

AB

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-640

STEP 3. Check the continuity at accelerator pedal position
sensor harness side connector D-138.
(1) Disconnect the connector D-138 and measure at the

harness side.

(2) Measure the continuity between terminal No. 1 and ground.

• Should be less than 2 ohms.

Q: Is the continuity normal?

YES : Go to Step 7.
NO : Go to Step 4.

STEP 4. Check connector D-135 at PCM for damage.
Q: Q: Is the connector in good condition?

YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 17.

AK200945

3

4

5

1

2

8

6

7

AB

CONNECTOR: D-138

HARNESS
CONNECTOR:
COMPONENT SIDE

D-138(GR)

3

4

5

1

2

8

6

7

AK201452

D-138 HARNESS
CONNECTOR:
COMPONENT SIDE

AB

AK200947

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112

113

114

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119

120

CONNECTOR: D-135

HARNESS CONNECTOR:
COMPONENT SIDE

AB

PCM

D-135(GR)