Mitsubishi Montero Sport (2004+). Manual — part 350
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-813
INSPECTION PROCEDURE 29: Fuel pump system.
BL
ACK
-
BL
UE
BL
ACK
-
WHITE
BL
ACK
-
WHITE
BL
ACK
-
WHITE
BL
ACK
-
WHITE
BL
ACK
-WHITE
BL
ACK
WHITE-RED
1 2
BL
ACK
-
WHITE
AK200196
Fuel Pump Circuit
BL
ACK
-
WHITE
FUEL PUMP
RELAY
3
4
2
1
FUEL
PUMP
4
ACC
IG1
R
2
IG2
ST
3
JUNCTION
BLOCK
LOCK
IGNITION SWITCH
POWERTRAIN CONTROL
MODULE (PCM)
E-26
21
1
12
15
14
2
10
2
3 4
5 6
7 8
9
11 12 13 14 15 16 17 18 19 20
30
21 22 23
24
25
26 27 28 29
31 32 33
34 35
1
C-89
(MU803784)
1
3
2
4
D-08
(MU801342)
1 2 3
4 5 6
D-15
C-60
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15 16 17 18 19 20 21 22
C-16
MU801461
1
10
15
2
11
3
12
4
13 14
5
16
6
17
7
18
8
19
9
20
E-44
1
2
3
4
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-814
.
CIRCUIT OPERATION
• A battery positive voltage is applied on the fuel
pump relay (terminals No. 3, No. 4) from the igni-
tion 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 coil. With this,
the fuel pump relay turns "ON" and the battery
positive voltage is supplied to the fuel pump from
the fuel pump relay (terminal No. 1).
.
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-cir-
cuited harness wire.
• Malfunction of the PCM.
AK103911AE
CONNECTOR: C-16
C-16
AK103738AD
CONNECTOR: C-89
PCM
C-89(GR)
AK200040AB
CONNECTOR: D-15
D-15(B)
AK200018 AB
CONNECTOR: E-44
E-44
AK201000
FUEL PUMP
RELAY
CONNECTOR: C-60
AC
C-60
AK200035AB
CONNECTOR: D-08
D-08
JUNCTION BLOCK
(REAR SIDE)
AK200204
CONNECTOR: E-26
AB
E-26
FUEL PUMP
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-815
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Using scan tool MB991958, check actuator test
item 07: Fuel Pump.
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 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 harness connector E-26 at fuel pump for
damage.
Q: Is the harness 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.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AK200045
2 1
CONNECTOR: E-26
AB
HARNESS CONNECTOR:
COMPONENT SIDE
E-26
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-816
STEP 3 Check the fuel pump operation.
(1) Disconnect fuel pump connector E-26.
(2) Use jumper wires to connect fuel pump connector terminal
No. 1 to the positive battery terminal and terminal No. 2 to
the negative battery terminal.
• An operating sound of the fuel pump should be heard.
Q: Is the fuel pump operating properly?
YES : Go to Step 4.
NO : Replace the fuel pump. Then confirm that the
malfunction symptom is eliminated.
STEP 4. Check for continuity at fuel pump harness side
connector E-26.
(1) Disconnect the connector E-26 and measure at the harness
side.
(2) Check for the continuity between terminal No. 2 and
ground.
• Should be less than 2 ohms.
Q: Does continuity exist?
YES : Go to Step 5.
NO : Check harness connector E-44 at intermediate
connector for damage, and repair or replace as
required. Refer to, GROUP 00E, Harness Connector
Inspection
. If intermediate connector E-44 is
in good condition, repair harness wire between fuel
pump connector E-26 (terminal No. 2) and ground.
Then confirm that the malfunction symptom is
eliminated.
AK200045
2 1
CONNECTOR: E-26
AB
HARNESS CONNECTOR:
COMPONENT SIDE
E-26
AK000644
2
1
FUEL PUMP SIDE
CONNECTOR
AB
AK200045
2 1
CONNECTOR: E-26
AB
HARNESS CONNECTOR:
COMPONENT SIDE
E-26
AK000645
2 1
E-26 HARNESS CONNECTOR:
COMPONENT SIDE
AC
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