Mitsubishi Montero (2002-2004). Manual — part 710
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-537
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 P0638 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
P0642 Throttle Position Sensor Power Supply
.
TECHNICAL DESCRIPTION
• PCM checks the TPS power voltage for abnormal
conditions.
.
DTC SET CONDITIONS
Check Conditions
• Battery positive voltage is higher than 6.3 volts.
Judgement Criteria
• TPS power voltage should be 4.1 volts or less for
0.5 seconds.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• PCM failed.
DIAGNOSIS
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
STEP 1. 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 P0642 set?
YES : Replace the PCM.
NO : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points
ACX01539
16-PIN
MB991502
AC
ACX01539
16-PIN
MB991502
AC
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-538
P0657 Throttle Actuator Control Motor Relay Circuit Malfunction
AK201461
TMROTTEL
ACTUATOR
CONTROL
MOTOR
THROTTEL ACTUATOR
CONTROL MOTOR
POWER SURCE
B-22X
B-23X
A-03
(MU802611)
WHITE-BLA
CK
WHITE-
BLA
CK
WHITE-
BLA
CK
WHITE-
BLACK
WHITE-
BLA
CK
SKY BLUE
To PCM
To PCM
MFI
RELAY
RED
RED
RED
FUSIBLE LINK(5)
2
3
6
4
1
4
3
2
1
15
132
D-136
D-132
1 2 3 4 5 6
7 8 9 10 11 12
1
2
3
4
1
2
3
4
POWERTRAIN
CONTROL
MODULE
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-539
.
CIRCUIT OPERATION
• Battery positive voltage is applied to the throttle
actuator control motor relay terminal (terminal
No. 3).
• Battery positive voltage is applied to the throttle
actuator control motor relay terminal (terminal
No. 4) from the MFI relay (terminal No. 1).
• PCM (terminal No. 15) applies current to the
throttle actuator control motor relay coil by turning
ON the power transistor in the unit in order to
turn the relay ON.
• When the throttle actuator control motor relay
turns ON, battery positive voltage is supplied by
the throttle actuator control motor relay (terminal
No. 1) to the PCM (terminal No. 132).
.
TECHNICAL DESCRIPTION
• When the ignition switch ON signal is input into
the PCM, the PCM turns ON the throttle actuator
control motor relay.
.
DTC SET CONDITIONS
Check Condition
• Ignition switch "ON" position.
Judgement Criteria
• The power line voltage of the electronic controlled
throttle system should be 4.9 volts or less for 0.8
seconds.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Throttle actuator control motor relay failed or mal-
adjusted.
• Open or shorted throttle actuator control motor
relay circuit, or loose connector.
• PCM failed.
AK201046
A-03(B)
AB
CONNECTOR: A-03
AK201171
B-23X
AB
CONNECTOR: B-23X
THROTTLE ACTUATOR
CONTROL MOTOR
RELAY
AK201039
MFI RELAY
B-22X
AB
CONNECTOR: B-22X
AK201565
CONNECTORS: D-132, D-136
AB
PCM
D-132(GR) D-136(GR)
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-540
DIAGNOSIS
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
STEP 1. Check connector B-23X at throttle actuator control
motor relay 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
. Then go to Step 14.
AK201172
2 1
3
4
B-23X
AB
CONNECTOR: B-23X
HARNESS
CONNECTOR:
COMPONENT SIDE
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