Mitsubishi Montero (2004+). Manual — part 166
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-151
STEP 5. Check for open circuit and harness damage
between throttle position sensor connector B-05 (terminal
No. 4) and PCM connector D-135 (terminal No. 105).
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
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-152
STEP 6. Using scan tool MB991958, check data list item 79:
Throttle Position Sensor (main).
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK"(OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 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 (MB991658) to connect only
terminals No. 1, No. 2, No. 3, and No. 4.
(6) Set scan tool MB991958 to the data reading mode for item
79, Throttle Position Sensor (main).
• Output voltage should be between 0.3 and 0.7 volt when
the throttle valve is fully closed with your finger.
• Output voltage should be 4.0 volts or more 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
NO : Replace the PCM. Then go to Step 8.
STEP 7. Replace the throttle body assembly.
(1) Replace the throttle body assembly.
(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 : Replace the PCM. Then go to Step 8.
NO : The procedure is complete.
AK302970
AB
MB991911
MB991824
MB991827
AK201174
1
6 5 4 3 2
B-05(B)
CONNECTOR: B-05
HARNESS
CONNECTOR:
COMPONENT SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-153
STEP 8. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK"(OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 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.
AK302970
AB
MB991911
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-154
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 PCM (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 resistance decreases.
• The engine coolant temperature sensor output
voltage increases when the resistance increases
and decreases when the resistance decreases.
.
YELLO
W
-GREEN
BLA
CK
AK302923
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)
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