Wiring

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Main relay wiring

On DDE 4 ECUs the main relay loom is usually separate from the engine harness. Automatic models may have a main DDE relay loom integrated to the engine harness. In any case, you can check that the relay is connected to plug 1 in this configuration. This will enable the ECU to control its own power. 

DDE 5 main relay (Follow Wiseman’s Engineering Ltd’s instructions)

6hp transmission wiring

The 6hp26 has a mechanical shifter. Therefore, the only necessary electrical connections to the transmission are as follows:

 – CAN high and CAN low to be connected to the engine    

 – Step-tronic signal (upshift and downshift)

 – Terminal 15 (Ignition)

 – Ground x2

 – Terminal 30 (Permanent fused supply)

-SLOCK + (Pin 7) and SLOCK – (pin 11) – These connect to the shift lock solenoid

The 6hp28 is wired up in the same manner, however there may be an electronic shifter to add. The pinouts for the electronic shifter are below:

CAN – bus 

In some cases you will need to wire up a can bus circuit, for example, when wiring up a 6hp transmission or other components.

CAN Hi wires should be connected together.

CAN Lo wires should be connected together.

One thing you must check, with all power turned off, the resistance between CAN Lo and CAN Hi should be 60 ohms. Quite often it will read 120 Ohms, in this case you should add a single 120 Ohm resistor from CAN Lo to CAN Hi. Since the CAN circuit is so short, it won’t really matter where you put this in the circuit.