Freelander System Description and Operation
COMMUNICATION DATA BUSES
DESCRIPTION AND OPERATION
86-4-9
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)
Diagnostic Socket (C0040)
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 and the ABS ECU.
Pin No.
Description
Input/output
1 to 3
Not used
–
4
Chassis earth
Output
5
Signal earth (From 2002.5 model
year)
Output
6
Not used
–
7
ISO 9141 K line
Input/Output
8 to 12
Not used
–
13
DS2 bus
Input/Output
14 and 15
Not used
–
16
Battery power supply
Input
