Mitsubishi Montero (2002-2004). Manual — part 600

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-97

STEP 2. Measure the sensor output voltage at engine
coolant temperature sensor connector B-37 by
backprobing.
(1) Do not disconnect the connector B-37.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 1 and ground by

backprobing.

• When engine coolant temperature is −20°C (−4°F), volt-

age should be 3.9 and 4.5 volts.

• When engine coolant temperature is 0°C (32°F), voltage

should be 3.2 and 3.8 volts.

• When engine coolant temperature is 20°C (68°F), volt-

age should be 2.3 and 2.9 volts.

• When engine coolant temperature is 40°C (104°F), volt-

age should be 1.3 and 1.9 volts.

• When engine coolant temperature is 60°C (140°F), volt-

age should be 0.7 and 1.3 volts.

• When engine coolant temperature is 80°C (176°F), volt-

age should be 0.3 and 0.9 volt.

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

YES : Go to Step 3.
NO : Go to Step 5.

STEP 3. Check connector B-37 at the engine coolant
temperature sensor 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 14.

AK200943

1

2

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-37

B-37(B)

AK201572

2

1

AB

B-37 HARNESS
CONNECTOR:
HARNESS SIDE

AK200943

1

2

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-37

B-37(B)

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-98

STEP 4. 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 : Replace the PCM. Then go to Step 14.

STEP 5. Check connector B-37 at engine coolant
temperature sensor 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 14.

ACX01539

16-PIN

MB991502

AC

AK200943

1

2

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-37

B-37(B)

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-99

STEP 6. Measure the sensor supply voltage at engine
coolant temperature sensor harness side connector B-37.
(1) Disconnect the connector B-37 and measure at the harness

side.

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

(3) Measure the voltage between terminal No. 1 and ground.

• Voltage should be between 4.5 and 4.9 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?

YES : Go to Step 8.
NO : Go to Step 7.

STEP 7. Check connector D-135 at PCM for damage.
Q: Is the connector in good condition?

YES : Replace the PCM. Then go to Step 14.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 14.

AK200943

1

2

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-37

B-37(B)

AK000234 AL

2 1

B-37 HARNESS
CONNECTOR:
COMPONENT SIDE

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)

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-100

STEP 8. Check the continuity at engine coolant
temperature sensor harness side connector B-37.
(1) Disconnect the connector B-37 and measure at the harness

side.

(2) Check for the continuity between terminal No. 2 and

ground.

• Should be less than 2 ohms.

Q: Is the continuity normal?

YES : Go to Step 11.
NO : Go to Step 9.

STEP 9. Check connector D-135 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 14.

AK200943

1

2

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-37

B-37(B)

AK000235

B-37 HARNESS
CONNECTOR:
COMPONENT SIDE

1

2

AL

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)