Mitsubishi Montero (2002-2004). Manual — part 726

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-601

.

CIRCUIT OPERATION

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

(main) power terminal (terminal No. 2) from the
PCM (terminal No. 92).
The ground terminal (terminal No. 1) is grounded
with PCM (terminal No. 91).

• When the accelerator pedal is moved from the

idle position to the fully opened position, the
resister between the APS (main) output terminal
(terminal No. 3) and ground terminal will increase
according to the rotation.

.

TECHNICAL DESCRIPTION

• The APS (main) outputs voltage which corre-

sponds to the accelerator pedal depression.

• The PCM checks whether the voltage is within a

specified range.

.

DTC SET CONDITIONS

Check Conditions

• Ignition switch "ON" position.

Judgement Criteria

• APS (main) output voltage is 0.2 volts or less for

1 second.

.

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

• APS failed or maladjusted.

• Open or shorted APS (main) circuit, or loose con-

nector.

• PCM failed.

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check data list item 78:
Accelerator Pedal Position Sensor (main).

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

78, Accelerator Pedal Position Sensor (main).

• 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 : Go to Step 2.

AK200944

ACCELERATOR
PEDAL
POSITION
SENSOR

AB

D-138(GR)

CONNECTOR: D-138

AK201038AF

CONNECTOR: D-135

PCM

D-135(GR)

ACX01539

16-PIN

MB991502

AC

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-602

STEP 2. Check connector D-138 at accelerator pedal
position sensor for damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 12.

STEP 3. 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 4.
NO : Replace the accelerator pedal position sensor. Then

go to Step 12.

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-603

STEP 4. Measure the sensor supply voltage at accelerator
pedal position sensor harness side connector D-138.
(1) Disconnect the connector D-138 and measure at the

harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 2 and ground.

• Voltage should be between 4.8 and 5.2 volts.

(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the measured voltage between 4.8 and 5.2 volts?

YES : Go to Step 8.
NO : Go to Step 5.

STEP 5. Check connector D-135 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 12.

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

AK201454

B-138 HARNESS
CONNECTOR:
COMPONENT SIDE

AB

AK200947

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

CONNECTOR: D-135

HARNESS CONNECTOR:
COMPONENT SIDE

AB

PCM

D-135(GR)

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-604

STEP 6. Check for open circuit and short circuit to ground
between accelerator pedal position sensor connector D-
138 (terminal No. 2) and PCM connector D-135 (terminal
No. 92).
Q: Is the harness wire in good condition?

YES : Go to Step 7.
NO : Repair it. Then go to Step 12.

STEP 7. Using scan tool MB991502, check data list item 78:
Accelerator Pedal Position Sensor (main).

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

78, Accelerator Pedal Position Sensor (main).

• 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

4

5

1

2

8

6

7

AB

CONNECTOR: D-138

HARNESS
CONNECTOR:
COMPONENT SIDE

D-138(GR)

AK200947

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

CONNECTOR: D-135

HARNESS CONNECTOR:
COMPONENT SIDE

AB

PCM

D-135(GR)

ACX01539

16-PIN

MB991502

AC