Mitsubishi Montero (2002-2004). Manual - part 599

 

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Mitsubishi Montero (2002-2004). Manual - part 599

 

 

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-93

STEP 6. Using scan tool MB991502, check data list item 79: 
Throttle 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) Detach the intake air hose at the throttle body.
(4) Disconnect the connector of the throttle position sensor.
(5) Use test harness special tool (MB991348) to connect only 

terminals No. 1, No. 2, No. 3, and No. 4.

(6) Set scan tool MB991502 to the data reading mode for item 

79, Throttle Position Sensor (main).

• Output voltage should be between 0.2 and 0.8 volts 

when the throttle valve is fully closed with your finger.

• Output voltage should be between 3.8 and 4.9 volts 

when the throttle valve is fully open with your finger.

(7) 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 9.

STEP 7. Check the throttle position sensor.
(1) Disconnect the connector B-05.

(2) Measure the resistance between throttle position sensor 

side connector terminals No. 2 and No. 4.

Standard value: 2 

− 4 kiloohms

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

YES : Go to Step 8.
NO :  Replace the throttle body ASSY. Then go to Step 9.

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

AK201512

THROTTLE POSITION
SENSOR SIDE 
CONNECTOR

AB

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-94

STEP 8. Using scan tool MB991502, check data list item 79: 
Throttle 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) Detach the intake air hose at the throttle body.
(4) Disconnect the connector of the throttle position sensor.
(5) Use test harness special tool (MB991348) to connect only 

terminals No. 1, No. 2, No. 3, and No. 4.

(6) Set scan tool MB991502 to the data reading mode for item 

79, Throttle Position Sensor (main).

• Output voltage should be between 0.2 and 0.8 volts 

when the throttle valve is fully closed with your finger.

• Output voltage should be between 3.8 and 4.9 volts 

when the throttle valve is fully open with your finger.

(7) 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 9.

STEP 9. 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 P0123 set?

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

ACX01539

16-PIN

MB991502

AC

ACX01539

16-PIN

MB991502

AC

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-95

DTC P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control

.

CIRCUIT OPERATION

• 5-volt voltage is applied to the engine coolant 

temperature sensor output terminal (terminal No. 
1) from the PCM (terminal No. 98) via the resistor 
in the PCM. The ground terminal (terminal No. 2) 
is grounded with (terminal No. 96).

• The engine coolant temperature sensor is a neg-

ative temperature coefficient type of resistor. It 
has the characteristic that when the engine cool-
ant temperature rises the resistor decreases.

• The engine coolant temperature sensor output 

voltage increases when the resistor increases 
and decreases when the resistor decreases.

.

YELLO

W

-GREEN

SKY B

ULE

AK201129

ENGINE COOLANT
TEMPERATURE SENSOR

POWERTRAIN CONTROL MODULE(PCM)

5 V

98

2

B-37

(MU802406)

96

1

Engine Coolant Temperature Sensor Circuit

1 2

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

D-135

(MU803805)

AK200942

ENGINE COOLANT
TEMPERATURE SENSOR

AK200942AB

B-37(B)

CONNECTOR: B-37

AK201038AF

CONNECTOR: D-135

PCM

D-135(GR)

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-96

TECHNICAL DESCRIPTION

• The engine coolant temperature sensor converts 

the engine coolant temperature to a voltage and 
output it.

• The PCM checks whether this voltage is within a 

specified range.

.

DTC SET CONDITIONS

Check Conditions, Judgement Criteria

• Engine coolant temperature decreases from 

higher than 40

°C (104°F) to lower than 40°C 

(104

°F).

• Then the engine coolant temperature has contin-

ued to be 40

°C (104°F) or lower for 5 minutes.

Check Conditions, Judgement Criteria

• About 60 − 300 seconds have passed for the 

engine coolant temperature to rise to about 7

°C 

(44.6

°F) after starting sequence was completed.

• However, time is not counted when fuel is shut 

off.

.

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

• Engine coolant temperature sensor failed.

• Open or shorted engine coolant temperature sen-

sor 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 21: 
Engine Coolant Temperature Sensor.

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 

21, Engine Coolant Temperature Sensor.

• The engine coolant temperature and temperature 

shown with the scan tool should approximately match.

(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.

ACX01539

16-PIN

MB991502

AC

 

 

 

 

 

 

 

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