Mitsubishi Montero (2004+). Manual — part 1142
13B-1
GROUP 13B
FUEL SUPPLY
CONTENTS
GENERAL DESCRIPTION. . . . . . . . .
FUEL SUPPLY DIAGNOSIS . . . . . . .
INTRODUCTION TO FUEL SUPPLY
DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . .
FUEL SUPPLY DIAGNOSTIC
TROUBLESHOOTING STRATEGY . . . . . .
SYMPTOM CHART. . . . . . . . . . . . . . . . . . .
SYMPTOM PROCEDURES . . . . . . . . . . . .
SPECIAL TOOLS. . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE. . . . . . . . . . .
FUEL LEVEL SENSOR CHECK . . . . . . . . .
FUEL LEVEL SENSOR REPLACEMENT. .
FUEL PUMP OPERATION CHECK . . . . . .
FUEL PUMP MODULE REPLACEMENT . .
FUEL TANK DIFFERENTIAL PRESSURE
SENSOR CHECK . . . . . . . . . . . . . . . . . . . .
LEVELING VALVE CHECK . . . . . . . . . . . . .
FUEL TANK . . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
FUEL PUMP (MODULE) DISASSEMBLY AND
ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS . . . . . . . . . . . . . . .
FASTENER TIGHTENING
SPECIFICATION . . . . . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATION . . . . . . . . . . . .
GENERAL DESCRIPTION
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FUEL SUPPLY
13B-2
GENERAL DESCRIPTION
M1135000100297
1. The fuel tank is located under the floor below the
rear seats.
2. A fuel tank rollover valve prevents fuel from leak-
ing out in the event of a collision.
FUEL SUPPLY DIAGNOSIS
INTRODUCTION TO FUEL SUPPLY DIAGNOSIS
M1135004000322
The fuel supply system supplies an appropriate
air/fuel mixture to the engine. There are the fuel tank,
fuel pump module assembly, and the fuel pipe that
couples each part. Engine malfunctions caused by
insufficient fuel supply or evaporative emission
eystem operation malfunctions can result from faults
in the vapor line, fuel pipe, hose, or fuel tank pres-
sure control valve, etc.
FUEL SUPPLY DIAGNOSTIC TROUBLESHOOTING STRATEGY
M1135004100039
Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find a
fuel supply fault.
1. Gather information from the customer.
2. Verify that the condition described by the
customer exists.
3. Find the malfunction by following the Symptom
Chart.
4. Verify malfunction is eliminated.
SYMPTOM CHART
M1135004200188
AC204062AB
FUEL PRESSURE
REGURATOR
FUEL ROLLOVER VALVE
FUEL LEVEL SENSOR
FUEL PUMP MODULE
LEVELING VALVE ASSEMBLY
EVAPORATIVE EMISSION
CANISTER
SYMPTOM
INSPECTION PROCEDURE REFERENCE PAGE
Engine malfunctions due to insufficient fuel supply
1
FUEL SUPPLY DIAGNOSIS
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FUEL SUPPLY
13B-3
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Engine Malfunctions Due to Insufficient Fuel Supply
.
TROUBLESHOOTING HINTS (The most likely causes for
this case: )
• Injector failed.
• Open or shorted injector circuit, or loose connector.
• Bent, kinked or clogged fuel pipe or hose.
• Malfunction of fuel pump module.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
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) Ensure that the ignition switch is at the "LOCK" (OFF)
position.
(2) Start up the personal computer.
(3) Connect special tool MB991827 to special tool MB991824
and the personal computer.
(4) Connect special tool MB991911 to special tool MB991824.
(5) Connect special tool MB991911 to the data link connector.
(6) Turn the power switch of special tool MB991824 to the "ON"
position.
NOTE: When special tool MB991824 is energized, special
tool MB991824 indicator light will be illuminated in a green
color.
(7) Start the MUT-III system on the personal computer.
(8) Turn the ignition switch to the "ON" position.
(9) Select "Interactive Diagnosis" from the start-up screen.
(10)Select "System select."
(11)Choose "MFI" from the "POWER TRAIN" tab.
(12)Select "MITSUBISHI."
(13)Select "Diagnostic Trouble Code."
(14)If a DTC is set, it is shown.
Q: Is the DTC set?
YES : Refer to GROUP 13A, Diagnostic Trouble Code Chart
NO : Go to Step 2.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
FUEL SUPPLY DIAGNOSIS
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FUEL SUPPLY
13B-4
STEP 2. Check the fuel pressure.
Refer to GROUP 13A, On-vehicle Service
− Fuel Pressure Test
.
Q: Is the fuel pressure in good condition?
YES : Go to Step 5.
NO : Repair or replace. Then go to Step 3.
STEP 3. Check for bending, twisting or clogging of the fuel
pipe or hose.
Q: Are the fuel pipe and hose in good condition?
YES : Go to Step 4.
NO : Repair or replace. Then go to Step 6.
STEP 4. Check the fuel pump module operation.
Refer to GROUP 13A, On-vehicle Service
− Fuel Pump Opera-
tion Check
.
Q: Is the fuel pump module operation in good condition?
YES : Go to Step 5.
NO : Replace. Then go to Step 6.
STEP 5. Check the inside of the fuel tank for contamination
and rust.
(1) Drain fuel.
(2) Remove the fuel tank (Refer to
Q: Is the fuel tank in good condition?
YES : Go to Step 6.
NO : Replace the fuel filter, and clean the fuel tank and fuel
line. Then go to Step 6.
STEP 6. Retest the system.
Q: Is the engine malfunction eliminated?
YES : The procedure is complete.
NO : Return to Step 1.
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