Mitsubishi Montero (2004+). Manual — part 297
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-675
STEP 1. Using scan tool MB991958, check data list item
9A: Throttle Position Sensor (main) Mid Opening Learning
Value.
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) Set scan tool MB991958 to the data reading mode for item
9A, Throttle position sensor (main) mid opening learning
value.
• Check that it is 4 volts or less.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is voltage 4 volts or less?
YES : Go to Step 2.
NO : Replace the throttle body ASSY. Then go to Step 17.
STEP 2. Check connector B-23X at throttle actuator control
motor relay for damage.
Q: Is the connector in good condition?
YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 17.
AK302970
AB
MB991911
MB991824
MB991827
AK201172
2 1
3
4
B-23X
AB
CONNECTOR: B-23X
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-676
STEP 3. Check the throttle actuator control motor relay.
(1) Remove the throttle actuator control motor relay.
(2) Check for continuity between the throttle actuator control
motor relay terminal No. 2 and No. 4.
• There should be continuity (approximately 70 ohms).
(3) Use jumper wires to connect throttle actuator control motor
relay terminal No. 4 to the positive battery terminal and
terminal No. 2 to the negative battery terminal.
(4) Check the continuity between the throttle actuator control
motor relay terminal No. 1 and No. 3 while connecting and
disconnecting the jumper wire at the negative battery
terminal.
• Should be less than 2 ohms. (Negative battery terminal
connected.)
• Should be open loop. (Negative battery terminal discon-
nected.)
(5) Install the throttle actuator control motor relay.
Q: Is the resistance normal?
YES : Go to Step 4.
NO : Replace the throttle actuator control motor relay.
Then go to Step 17.
AK201172
2 1
3
4
B-23X
AB
CONNECTOR: B-23X
HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
AK201380AC
THROTTLE ACTUATOR
CONTROL MOTOR RELAY
SIDE CONNECTOR
1
2
3
4
AK201381
THROTTLE ACTUATOR
CONTROL MOTOR RELAY
SIDE CONNECTOR
AC
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-677
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) 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 5.
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 17.
STEP 5. 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 7.
NO : Go to Step 6.
AK201172
2 1
3
4
B-23X
AB
CONNECTOR: B-23X
HARNESS
CONNECTOR:
COMPONENT SIDE
2 1
3
4
AK201382AC
B-23X HARNESS
CONNECTOR:
COMPONFNT SIDE
AK201172
2 1
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-678
STEP 6. 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 17.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 17.
STEP 7. 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 8.
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
17.
AK200951
2 1
3
4
B-22X
AB
CONNECTOR: B-22X
HARNESS
CONNECTOR:
COMPONENT SIDE
AK200938
2
3
4
5
6
7
8
9
1
10
14
15
16
17
18
19
20
21
22
23
24
25
26
27
11
12
13
AB
CONNECTOR: D-132
HARNESS CONNECTOR:
COMPONENT SIDE
PCM
D-132(GR)
2
3
4
5
6
7
8
9
1
10
14
15
16
17
18
19
20
21
22
23
24
25
26
27
11
12
13
AK201447
D-132 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
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