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

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

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

13CU LRNA19001A

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/14CUX

T

• 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

GEMS

GEMS LRNA19005

• 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

Bosch Motronic 5.2.1

N18037A

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

FUEL SYSTEM OUTPUTS

Fuel Pump

Fuel Return Type Systems -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

Non-Return Type System