Controller Area Network (CAN)

AUTOMATIC TRANSMISSION – ZF 5HP24

44-2-48 DESCRIPTION AND OPERATION

Controller Area Network (CAN)
The CAN is a high speed broadcast bus network connected between the following electronic units:

l

EAT ECU

l

ECM

l

Transfer box ECU

l

Air suspension ECU

l

Instrument pack

l

ABS ECU

l

Steering angle ECU.

The CAN allows fast exchange of data between ECU's. The CAN comprises two wires which are identified as CAN 
high (H) and CAN low (L). The two wires are coloured yellow/black (H) and yellow/brown (L) and are twisted together 
to minimise electromagnetic interference (noise) produced by the CAN messages.
 

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 COMMUNICATION DATA BUSES, DESCRIPTION AND OPERATION, Description.

In the event of a CAN failure, the following symptoms may be observed:

l

Transmission operates in default mode

l

Torque converter lock-up control is disabled

l

ECM to EAT ECU engine torque reduction message inoperative

l

Gear position display in instrument pack inoperative.