Mitsubishi Montero (2002-2004). Manual — part 709

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-533

.

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

• Throttle valve return spring failed.

• Throttle valve operation failed.

• Throttle actuator control motor failed or malad-

justed.

• Open or shorted throttle actuator control motor

circuit, or loose connector.

• PCM failed.

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check data list item
9A: Throttle Position Sensor (main) Mid Opening Learning
Value.

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

9A, Throttle position sensor (main) mid opening learning
value.

• Check that it is 4 volts or less.

(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is voltage 4 volts or less?

YES : Go to Step 2..
NO : Replace the throttle body ASSY. Then go to Step 8.

STEP 2. Check the throttle actuator control motor.
(1) Disconnect the connector B-05.

(2) Measure the resistance between throttle actuator control

motor side connector terminal No. 5 and No. 6.

Standard value: 0.3

− 100 ohms

Q: Is the measured resistance between 0.3 and 100 ohms?

YES : Go to Step 3.
NO : Replace the throttle body ASSY. Then go to Step 8.

ACX01539

16-PIN

MB991502

AC

AK201174

1

6 5 4 3 2

B-05(B)

CONNECTOR: B-05

HARNESS
CONNECTOR:
COMPONENT SIDE

AB

6

1 2 3 4 5

AK201513AB

THROTTLE ACTUATOR
CONTROL MOTOR
SIDE CONNECTOR

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-534

STEP 3. Check connector B-05 at throttle actuator control
motor 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 8..

STEP 4. Check connector D-136 at PCM for damage.
Q: Is the connector in good condition?

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

Connector Inspection . Then go to Step 8.

AK201174

1

6 5 4 3 2

B-05(B)

CONNECTOR: B-05

HARNESS
CONNECTOR:
COMPONENT SIDE

AB

AK201170

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

CONNECTOR: D-136

PCM

D-136(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AB

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-535

STEP 5. Check for harness damage between throttle
actuator control motor connector B-05 (terminal No. 6) and
PCM connector D-136 (terminal No. 133).
Q: Is the harness wire in good condition?

YES : Go to Step 6.
NO : Repair it. Then go to Step 8.

AK201174

1

6 5 4 3 2

B-05(B)

CONNECTOR: B-05

HARNESS
CONNECTOR:
COMPONENT SIDE

AB

AK201170

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

CONNECTOR: D-136

PCM

D-136(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AB

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-536

STEP 6. Check for harness damage between throttle
actuator control motor connector B-05 (terminal No. 5) and
PCM connector D-136 (terminal No. 141).
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, 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 P0638 set?

YES : Replace the PCM. Then go to Step 8.
NO : It can be assumed that this malfunction is intermittent.

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

AK201174

1

6 5 4 3 2

B-05(B)

CONNECTOR: B-05

HARNESS
CONNECTOR:
COMPONENT SIDE

AB

AK201170

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

CONNECTOR: D-136

PCM

D-136(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AB

ACX01539

16-PIN

MB991502

AC