LR_Fuel_InjectionSystems.pdf

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LAND ROVER FUEL INJECTION SYSTEMS
LAND ROVER FUEL INJECTION SYSTEMS
INTRODUCTION
Land Rover vehicles use one of two types of electronically controlled fuel injection systems:
Multiport Fuel Injection (MFI) or Sequential Multiport Fuel Injection (SFI).
MULTIPORT FUEL INJECTION (MFI)
Multiport Fuel Injection (MFI) is found on Land Rover models using the Lucas 13 CU, 14 CU,
and 14 CUX engine management systems.
Applications:
• 13CU
1987-1988 Range Rover Classic
• 14CU
1989 Range Rover Classic
• 14CUX
1990-1995 Range Rover Classic
1994-1995 Discovery
1993 Defender 110
1994-1995 Defender 90
SEQUENTIAL MULTIPORT FUEL INJECTION (SFI)
Sequential Multiport Injection (SFI) is used on vehicles equipped with the Sagem/Lucas Generic
Engine Management System (GEMS), and the Bosch Motronic M5.2.1 engine management
system.
Applications:
• GEMS
1995-early 1999 Range Rover
1996-early 1999 Discovery
1997 Defender 90
• Bosch Motronic 5.2.1
1999- Range Rover
1999- Discovery Series II
Introduction
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LAND ROVER FUEL INJECTION SYSTEMS
LAND ROVER FUEL SYSTEM COMPONENTS
The following section will provide an overview and comparison of Land Rover fuel system
components in use since 1987. These components will be discussed in the order of Engine
Control Module, System Outputs, and System Inputs.
Engine Control Module (ECM)
13CU
• Used 1987 & 1988
• Limited on-board self-diagnostics
• Adaptive short term fuelling offsets for each bank
• Volatile fault memory
• Diagnostics with Land Rover/Lucas Hand-Held Tester or TestBook
• Mounted under the passenger seat
14CU/14C UX
• 14CU used 1989, 14CUX used 1990-1995
• 14CU supports adaptive TPS and ISC
• EVAP purge control
• 14CUX has extended memory & supports on-board diagnostics compliant with OBD 1
• Volatile fault memory
• Replaceable PROM chips
• Mounted under the passenger seat on 1989-1994 Range Rover Classic and 1995
Defender; Right side kick panel 1995 Range Rover Classic and Discovery; Under right side
dash 1993 Defender 110 and 1994 Defender 90.
• Diagnostics via On-board display or with Land Rover/Lucas Hand-Held Tester or TestBook
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LAND ROVER FUEL INJECTION SYSTEMS
GEMS
• Used (Range Rover) 1995 to early 1999, (Discovery) 1996- early 1999, (Defender) 1997
• Both short term and long term fuelling offsets
• Ignition timing control integration
• Engine immobilization
• OBDII compliant on-board diagnostics
• Non-Volatile fault memory
• Replaceable PROM chips
• Diagnostics with SAE J1962/J1979 compatible tester or TestBook
• Mounted in engine compartment
B osch Motroni c 5.2.1
• Used 1999 - present
• Additional memory, faster processor/data bus refresh speed
• OBDII compliant on-board diagnostics and additional advanced diagnostic capability
• Both volatile and non-volatile (LEV) fault memory
• EEPROM programmable via data link
• Diagnostics with SAE J1962/J1979 compatible tester or TestBook
Land Rover Fuel System Components
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LAND ROVER FUEL INJECTION SYSTEMS
FUEL SYSTEM OUTPUTS
Fuel Pump
Fuel Retur n Type Syste ms -1987 to 1990
1991-1999
• Used 1987- early 1999
• Integral fuel level sending unit beginning 1991
• In-tank with external fuel filter
• 2.4-2.6 bar (34-37 psi) operating pressure
• Key off pressure drop from 2.3-2.6 bar (36-38 psi)- less
than 0.7 bar (10 psi) in one minute
• Integral Advanced EVAP sensor from October 1996
No n-Return Type System
• Used with Bosch EMS 1999- present
• Integral fuel pressure regulator
• 3.5 bar (50.75 psi) operating pressure
• Integral advanced EVAP sensor 1999-present (Except LEV Phase II vehicles)
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LAND ROVER FUEL INJECTION SYSTEMS
Fuel Filter
R eturn Type Sy stems
• External 1987-1999
• Mounted on the chassis, near the passenger-side rear wheel arch. An arrow on the filter
body indicates the direction of fuel flow.
• Worm clamps 1987-1990
• O-Ring and Fitting 1991- early 1999
Non -Return Type System
• 1999- present (Bosch EMS)
• Integral with fuel pump
• Coarse gauze filter in swirl pot
• Fine paper filter around pump inlet
Fuel Pressure Regulator
R eturn Type Sy stems
• Mounted on fuel rail
• No service adjustments
• Adjusts pressure relative to intake manifold pressure
Fuel System Outputs
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