Workshop Manuals Factory service & repair Land Rover
Land Rover Freelander System Description and Operation (UK)35 · Communication data buses
35 · General

Communication data buses (Diagnostic Buses): Description and operation

Make
Land Rover
Model
Freelander System Description and Operation (UK)
Section
Description and operation › Diagnostic Buses
Communication data busesDiagnostic Buses
MessageSource Destination
Torque level requiredEAT ECUECM
Transmission fault statusEAT ECUInstrument pack
Gearbox cooling requestEAT ECUECM
Fuel levelInstrument packECM (not diesel)
A/C requestInstrument packECM
A/C switch statusInstrument packECM
A/C compressor loadInstrument packECM (Td4 and NAS KV6 only)
Engine cooling fan speedInstrument packECM (Td4 and NAS KV6 only)
Vehicle reference speedInstrument packEAT ECU, ECM (not Td4)
Gear selected (manual gearbox)Instrument packABS ECU

Diagnostic Buses

The diagnostic buses connect the diagnostic socket to the ECU's on the CAN bus and to individual system ECU's. The diagnostic buses enable fault diagnosis, system testing and vehicle configuration.

Diagnostic Socket (C0040)

16

1

M86 5037

9

8

Diagnostic Socket (C0040)

Pin No.DescriptionInput/output
1 to 3Not used–
4Chassis earthOutput
5 and 6Not used–
7ISO 9141 K lineInput/Output
8 to 12Not used–
13DS2 busInput/Output
14 and 15Not used–
16Battery power supplyInput

ISO 9141 K Line The ISO 9141 K line connects the diagnostic socket to the majority of the ECU's fitted to the vehicle. The protocol used means that non TestBook/T4 diagnostic equipment, such as scan tools, can be used to access SRS and emission related faults stored in the ECU memories.

DS2 Bus The DS2 bus connects the diagnostic socket to the immobilisation ECU. The protocol used means that only TestBook/ T4 can communicate with the immobilisation system.

Parts & tools for this job For Land Rover Freelander

Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.