Mitsubishi Montero (2004+). Manual — part 207
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-315
STEP 2. Check the left bank heated oxygen sensor (front).
(1) Disconnect left bank heated oxygen sensor (front)
connector B-26 and connect test harness special tool,
MB991316, to the connector on the left bank heated oxygen
(front) sensor side.
(2) Measure the resistance between heated oxygen sensor
connector terminal No. 1 (red clip) and terminal No. 3 (blue
clip).
Standard value: 4.5
− 8.0 ohms [at 20°C (68°F)]
Q: Is the measured resistance between 4.5 and 8.0 ohms
[at 20
°C (68°F)]?
YES : Go to Step 3.
NO : Replace the left bank heated oxygen sensor (front).
Then go to Step 12.
AK201278
1
2
3
4
CONNECTOR: B-26
B-26(GR)
AC
HARNESS
CONNECTOR:
COMPONENT
SIDE
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
AKX01624 AB
MB991316
HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR
BLUE
RED
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-316
STEP 3. Measure the power supply voltage at left bank
heated oxygen sensor (front) harness side connector B-26.
(1) Disconnect the connector B-26 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 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 5.
NO : Go to Step 4.
STEP 4. Check harness connector B-22X at the MFI relay
for damage.
Q: Is the harness connector in good condition?
YES : Repair harness wire between MFI relay connector
B-22X (terminal No. 1) and left bank heated oxygen
sensor (front) connector B-26 (terminal No. 1)
because of open circuit or short circuit to ground.
Then go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
AK201278
1
2
3
4
CONNECTOR: B-26
B-26(GR)
AC
HARNESS
CONNECTOR:
COMPONENT
SIDE
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
AKX01496
B-26 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
AR
AK200951
2 1
3
4
B-22X
AB
CONNECTOR: B-22X
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-317
STEP 5. Meaure the power supply voltage at PCM
connector D-132 by backprobing.
(1) Do not disconnect the connector D-132.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 10 and ground
by backprobing.
• 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 : Go to Step 6.
STEP 6. Check harness connector D-132 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
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)
AK201411
1
2
3
5
6 7 8 9
4
20
21 22
232425
2627
10111213
14 15
16 1718
19
D-132 HARNESS
CONNECTOR:
HARNESS SIDE
AB
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)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-318
STEP 7. Check for open circuit or short circuit to ground
between left bank heated oxygen sensor (front) connector
B-26 (terminal No. 3) and PCM connector D-132 (terminal
No. 10).
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then go to Step 12.
NO : Repair it. Then go to Step 12.
AK201278
1
2
3
4
CONNECTOR: B-26
B-26(GR)
AC
HARNESS
CONNECTOR:
COMPONENT
SIDE
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
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)
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