Mitsubishi Montero (2002-2004). Manual — part 1067
13B-1
CONTENTS
GENERAL DESCRIPTION. . . . . . . . .
FUEL SUPPLY DIAGNOSIS . . . . . . .
INTRODUCTION. . . . . . . . . . . . . . . . . . . . .
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 . . . . . . . . . . . . . . . . . . . .
FUEL TANK REMOVAL AND
INSTALLATION . . . . . . . . . . . . . . . . . . . . . .
FUEL TANK INSPECTION . . . . . . . . . . . . .
FUEL PUMP (MODULE) DISASSEMBLY AND
ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS . . . . . . . . . . . . . . .
FASTENER TIGHTENING
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATIONS . . . . . . . . . . .
GENERAL DESCRIPTION
TSB Revision
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 sys-
tem operation malfunctions can result from faults in
the vapor line, fuel pipe, hose, or fuel tank pressure
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.
AC204062AB
FUEL PRESSURE
REGURATOR
FUEL ROLLOVER VALVE
FUEL LEVEL SENSOR
FUEL PUMP MODULE
LEVELING VALVE ASSEMBLY
EVAPORATIVE EMISSION
CANISTER
FUEL SUPPLY DIAGNOSIS
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FUEL SUPPLY
13B-3
SYMPTOM CHART
M1135004200188
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:
• MB991502: Scan Tool (MUT-II)
• MB991637: Fuel Pressure Gauge Set
• MD998709: Adaptor Hose
• MD998742: Hose Adaptor
STEP 1. Using scan tool MB991502, read the diagnostic
trouble code (DTC).
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) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC is output?
YES : Refer to GROUP 13A, Diagnostic Trouble Code Chart
NO : Go to Step 2.
SYMPTOM
INSPECTION PROCEDURE REFERENCE PAGE
Engine malfunctions due to insufficient fuel supply
1
ACX01539
16-PIN
MB991502
AC
FUEL SUPPLY DIAGNOSIS
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FUEL SUPPLY
13B-4
STEP 2. Check the fuel pressure.
(1) Release residual pressure from the fuel line to prevent fuel
spray. (Refer to
WARNING
To prevent a fire, cover the hose connection with
shop towels to prevent splashing of fuel that could be
caused by some residual pressure in the fuel pipe
line.
(2) Disconnect the high-pressure fuel hose at the fuel rail side.
(3) Assemble the fuel pressure measurement tools as follows.
<When using the fuel pressure gauge>
a.
Remove the union joint and bolt from special tool
MD998709 (adaptor hose) and instead attach special
tool MD998742 (hose adaptor) to the adaptor hose.
b. Place a suitable O-ring or gasket on assembled special
tools MD998709 and MD998742 and install the fuel
pressure gauge.
c. Install the assembled fuel pressure measurement tools
between the fuel rail and high-pressure fuel hose.
<When using the special tool MB991637 (fuel pressure
gauge set)>
a.
Remove the union joint and bolt from special tool
MD998709 (adaptor hose) and instead attach special
tool MD998742 (hose adaptor) to the adaptor hose.
b. Install special tool MB991637 (fuel pressure gauge set)
to assembled special tools MD998709 and MD998742
via a gasket.
c. Install the assembled fuel pressure measurement tools
between the fuel rail and the high-pressure fuel hose.
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.
(4) Connect scan tool MB991502 to the data link connector.
(5) Use the Actuator test 07 to drive the fuel pump. Check that
there is no fuel leaking from any section when the fuel
pump is operating.
(6) Stop the fuel pump.
(7) Start the engine and run at idle.
(8) Measure fuel pressure while the engine is running at idle.
Standard value: Approximately 270 kPa (38 psi) at
curb idle
AKX01456
HIGH-PRESSURE
FUEL HOSE
FUEL-
RAIL
AB
AKX01457AB
FUEL PRESSURE
GAUGE
O-RING OR GASKET
MD998709
MD998742
HIGH-PRESSURE
FUEL HOSE
FUEL
RAIL
AKX01458
MB991637
O-RING OR GASKET
MD998709
MD998742
HIGH-
PRESSURE
FUEL HOSE
FUEL
RAIL
AB
ACX01539
16-PIN
MB991502
AC
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