Diagnostics

AUTOMATIC TRANSMISSION – ZF 5HP24

DESCRIPTION AND OPERATION 44-2-45

Main Relay
The main relay is located inside the E-box and is identified by its blue colour. The relay is connected directly from the 
battery via a 100 Amp remote fuse. The relay coil is controlled by the ECM which provides a ground for the coil when 
the relay is energised.

When energised, the main relay supplies battery voltage, via fuse 1 in the engine compartment fusebox, to the EAT 
ECU.

Diagnostics
The diagnostic socket is located in the fascia, in the driver's side stowage tray. The socket is secured in the fascia 
panel and is protected by a hinged cover.

18 to 20

Not used

–

21

Power supply for SV's

Output

22

Temperature sensor signal

Input

23

Input shaft speed sensor supply

Output

24

Inhibitor switch contacts L2

Input

25

Not used

–

26

Ground for SV 2 solenoid

Input

27

Ground for EPRS 2

Input

28

Ground for EPRS 1

Input

29 and 30

Not used

–

31

Ignition power supply to inhibitor switch

Output

32

Not used

–

33

Input shaft speed sensor signal

Input

34

Inhibitor switch contacts L1

Input

35

Not used

–

36

CAN bus high

Input/Output

37

CAN bus low

Input/Output

38

Ground for SV 1

Input

39 and 40

Not used

–