Mitsubishi Montero (2002-2004). Manual — part 759
TSB Revision
SYMPTOM PROCEDURES
13Ad-85
INSPECTION PROCEDURE 29: Fuel pump system.
M
BLUE-
BLA
CK
AK201158
BLA
CK
BLA
CK
BLA
CK-BLUE
BLA
CK-BLUE
BLUE-GREEN
BLA
CK
BLUE-
BLA
CK
RED-
WHITE
BLUE-
BLA
CK
BLA
CK-BLUE
BLA
CK-BLUE
BLA
CK-BLUE
BLA
CK-BLUE
BLA
CK-BLUE
3 4
1 2
B-24X
3 4
1 2
B-19X
FUEL PUMP
RELAY 2
FUEL PUMP
RELAY 1
POWERTRAIN
CONTROL
MODULE (PCM)
4
1
5
17
2
3
16
4
3
4 5
1 2 3
G-04
(MU802058)
8
R
IG2
ST
LOCK
ACC
IG1
2
IGNITION
SWITCH-IG
5
2
4
17
1
12 13 14
18
30
41
34
3
16
10
6 7
19
31
42
20
32
43
21
33
25
24
26
36
35
37
29
28
15
27
38
8 9
39 40
11
2
22
5
23
D-111
38
4
3
5
4
2
1
3
4 5 6
1 2
D-204
3
2
4 5 6
1
D-208
MU801331
9
6
10
17
18
29
2
3 4
7 8
19 20
30 31
12
11
24
33 34 35
21
32
27
26
36 37
28
38
25
13
15
14
16
23
22
1
5
E-111
E-111
E-111
7
9
1
3
6
11
2
4
8
5
10
D-221
(MU801866)
A-05
(MU802749)
8
7
6
5
1 2 3 4
F-07
MU802609
FUEL
PUMP
Fuel Pump Circuit
1
2
3
5
6 7 8 9
4
20
21 22
232425
2627
10111213
14 15
16 1718
19
D-132
(MU803802)
FUSIBLE
LINK(1)
6
20A
RELAY
BOX
1
2 3
5
6 7
4
8
TSB Revision
SYMPTOM PROCEDURES
13Ad-86
.
AK201553
1
2
3
4
5
G-04(GR)
AB
CONNECTOR: G-04
HARNESS
CONNECTOR:
COMPONENT SIDE
AK201038
CONNECTOR: D-132
AB
PCM
D-132(GR)
AK201041AD
CONNECTOR: D-208
D-208
AK201176
B-19X
B-24X
AB
CONNECTORS: B-19X, B-24X
FUEL PUMP
RELAY (1)
FUEL PUMP
RELAY (2)
AK201045
D-204
AB
CONNECTOR: D-204
AK201294
D-221
AB
CONNECTOR: D-221
AK201060
E-111
AB
CONNECTOR: E-111
AK201055
CONNECTOR: D-111
D-111
AB
AK201054
F-07(B)
AB
CONNECTOR: F-07
AK201351
A-05(B)
AB
CONNECTOR: A-05
TSB Revision
SYMPTOM PROCEDURES
13Ad-87
CIRCUIT OPERATION
• Battery positive voltage is applied to the fuel
pump relay 2 (terminal No. 4) from the ignition
switch-IG.
Ground is provided through (terminal No. 2) to
chassis ground.
• When the ignition switch is turned to the "ON"
position, the fuel pump relay 2 turns ON.
• A battery positive voltage is applied on the fuel
pump relay 1 (terminal No. 2) from the ignition
switch-IG.
• During cranking and while the engine is running,
the PCM turns the power transistor in the PCM
ON to ground the fuel pump relay 1 coil. With this,
the fuel pump relay 1 turns ON, and the battery
positive voltage is supplied to the fuel pump from
the fuel pump relay 1 (terminal No. 1), via fuel
pump relay 2.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Malfunction of the fuel pump relay.
• Malfunction of the fuel pump.
• Improper connector contact, open or short-
circuited harness wire.
• Malfunction of the PCM.
DIAGNOSIS
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, check actuator test
item 07: Fuel Pump.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to the actuator test mode for item
07, Fuel Pump.
• An operation sound of the fuel pump should be heard.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the fuel pump operating properly?
YES : That this malfunction is intermittent. Refer to GROUP
00, How to Use Troubleshooting/Inspection Service
Points
NO : Go to Step 2.
STEP 2. Check connector B-19X at fuel pump relay 1 and
connector B-24X at fuel pump relay 2 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 confirm that the
malfunction symptom is eliminated.
ACX01539
16-PIN
MB991502
AC
AK201178
2 1
3
4
B-19X
B-24X
AB
CONNECTORS: B-19X, B-24X
HARNESS
CONNECTOR:
COMPONENT SIDE
TSB Revision
SYMPTOM PROCEDURES
13Ad-88
STEP 3. Check the fuel pump relay 1 and 2.
(1) Remove the fuel pump relay.
(2) Check for continuity between the fuel pump relay terminal
No. 2 and No. 4.
• There should be continuity. (approximately 70 ohms)
(3) Use jumper wires to connect fuel pump relay terminal No. 4
to the positive battery terminal and terminal No. 2 to the
negative battery terminal.
(4) Check for continuity between the fuel pump 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 fuel pump relay.
Q: Is the resistance normal?
YES : Go to Step 4.
NO : Replace the fuel pump relay. Then confirm that the
malfunction symptom is eliminated.
AK201178
2 1
3
4
B-19X
B-24X
AB
CONNECTORS: B-19X, B-24X
HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
AK201380
FUEL PUMP
RELAY SIDE
CONNECTOR
AK201380AB
1
2
3
4
AK201381
FUEL PUMP
RELAY SIDE
CONNECTOR
AK201381AB
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