Mitsubishi Montero (2004+). Manual — part 301
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-691
STEP 3. Measure the power supply voltage at throttle
actuator control motor relay harness side connector B-23X
(1) Disconnect the connector B-23X and measure at the
harness side.
(2) Measure the voltage between terminal No. 3 and ground.
• Voltage should be battery positive voltage.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 4.
NO : Check harness connector A-03 at intermediate
connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection
. If intermediate connector A-03 is
in good condition, repair it because of open circuit or
short circuit to ground between fusible link (5) and
throttle actuator control motor relay connector B-23X
(terminal No. 3). Then go to Step 14.
STEP 4. Measure the power supply voltage at throttle
actuator control motor relay harness side connector
B-23X.
(1) Disconnect the connector B-23X and measure at the
harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 4 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 6.
NO : Go to Step 5.
AK201172
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3
4
B-23X
AB
CONNECTOR: B-23X
HARNESS
CONNECTOR:
COMPONENT SIDE
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3
4
AK201382AC
B-23X HARNESS
CONNECTOR:
COMPONFNT SIDE
AK201172
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3
4
B-23X
AB
CONNECTOR: B-23X
HARNESS
CONNECTOR:
COMPONENT SIDE
2 1
3
4
AK201383
B-23X HARNESS
CONNECTOR:
COMPONFNT SIDE
AC
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-692
STEP 5. Check connector B-22X at MFI relay for damage.
Q: Is the connector in good condition?
YES : Repair harness wire between MFI relay connector
B-22X (terminal No. 1) and throttle actuator control
motor relay connector B-23X (terminal No. 4)
because of open circuit or short circuit to ground.
Then go to Step 14.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 14.
STEP 6. Measure the power supply voltage at PCM harness
side connector D-132.
(1) Disconnect the connector D-132 and measure at the
harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 15 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 7.
NO : Repair harness wire between throttle actuator control
motor relay connector B-23X (terminal No. 2) and
PCM connector D-132 (terminal No. 15) because of
open circuit or short circuit to ground. Then go to Step
14.
AK200951
2 1
3
4
B-22X
AB
CONNECTOR: B-22X
HARNESS
CONNECTOR:
COMPONENT SIDE
AK200938
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13
AB
CONNECTOR: D-132
HARNESS CONNECTOR:
COMPONENT SIDE
PCM
D-132(GR)
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AK201447
D-132 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-693
STEP 7. Measure the power supply voltage at PCM harness
side connector D-136.
(1) Disconnect the connector D-136 and measure at the
harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 132 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 10.
NO : Go to Step 8.
AK201170
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136
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146
CONNECTOR: D-136
PCM
D-136(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AB
121
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129
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132
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136
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146
AK201448
AB
D-136 HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-694
STEP 8. Check for open circuit and short circuit to ground
between throttle actuator control motor relay connector
B-23X (terminal No. 1) and PCM connector D-136 (terminal
No. 132).
Q: Is the harness wire in good condition?
YES : Go to Step 9.
NO : Repair it. Then go to Step 14.
AK201172
2 1
3
4
B-23X
AB
CONNECTOR: B-23X
HARNESS
CONNECTOR:
COMPONENT SIDE
AK201170
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122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
CONNECTOR: D-136
PCM
D-136(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AB
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