Mitsubishi Montero (2004+). Manual - part 162

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-135

STEP 7. 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: Does continuity exist?

YES : Go to Step 10.
NO :  Go to Step 8.

STEP 8. Check connector D-135 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 9.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 11.

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)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-136

STEP 9. Check for open circuit between engine coolant 
sensor connector B-37 (terminal No. 2) and PCM connector 
D-135 (terminal No. 96).
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 11.
NO :  Repair it. Then go to Step 11.

AK200943

1

2

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-37

B-37(B)

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)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-137

STEP 10. Check the engine coolant temperature sensor.
(1) Disconnect the engine coolant temperature sensor 

connector B-37.

(2) Remove the engine coolant temperature sensor.

(3) With the temperature sensing portion of engine coolant 

temperature sensor immersed in hot water, check 
resistance.

Standard value:

14 

− 17 kΩ [at −20°C (−4°F)]

5.1 

− 6.5 kΩ [at 0°C (32°F)]

2.1 

− 2.7 kΩ [at 20°C (68°F)]

0.9 

− 1.3 kΩ [at 40°C (104°F)]

0.48 

− 0.68 kΩ [at 60°C (140°F)]

0.26 

− 0.36 kΩ [at 80°C (176°F)]

(4) Apply 3M

 AAD part number 8731 or equivalent on the 

screw section of the engine coolant temperature sensor.

(5) Install the engine coolant temperature sensor, and tighten 

to the specified torque.

Tightening torque: 29 

± 10 N⋅m (22 ± 7 ft-lb)

Q: Is the resistance at the standard value?

YES : Replace the PCM. Then go to Step 11.
NO :  Replace the engine coolant temperature sensor. Then 

go to Step 11.

STEP 11. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13A-4

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0118 set?

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

AK200943

1

2

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-37

B-37(B)

AKX01622

AKX01623 AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-138

DTC P0122: Throttle Position Sensor (Main) Circuit Low Input

.

CIRCUIT OPERATION

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

position sensor (main) power terminal (terminal 
No. 2) from the PCM (terminal No. 106).
The ground terminal (terminal No. 4) is grounded 
with PCM (terminal No. 105).

• When the throttle valve shaft is turned from the 

idle position to the fully opened position, the 
resistance between the throttle position sensor 
(main) output terminal (terminal No. 1) and 
ground terminal (terminal No. 4) will increase 
according to the rotation.

.

AK201130

RED

WHITE

BLA

CK

B-05

5 V

106

2

THROTTLE
POSITION
SENSOR
(MAIN)

POWERTRAIN CONTROL MODULE (PCM)

115

105

1

4

Throttle Position Sensor (Main) Circuit

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

D-135

(MU803805)

6

1 2 3 4 5

AK201173

THROTTLE 
POSITION 
SENSOR

AB

B-05(B)

CONNECTOR: B-05

AK201038AF

CONNECTOR: D-135

PCM

D-135(GR)