Thread: D2 ECM changeover

I am buying a Mark Adams ECM for my 4.6.
I am fairly sure I have the correct short term replacement to keep our caravaning trip underway while the original goes to England.

What I am trying to find out is the correct procedure for the ECM swapover.
What type of Diagnostic tool will work in this application? Do all the different brands require a seperate "D2 V8 module" ??

All advice gratefully received

You'll need a dedicated tester like T4, Nanocom, Hawkeye or similar to make the ECM learn the immobiliser security code from the BCU otherwise it will not start at all or start once then immediately stall

Originally Posted by ENGINE MANAGEMENT SYSTEM - V8

Immobilisation system
The ECM and the body control unit (BCU) security system comprise the immobilisation system.
The ECM and the BCU combine to prevent the engine from running unless the appropriate security criteria are met.
The ECM and the BCU are a matched pair, if either one is replaced for any reason, the system will not operate unless
the replaced unit is correctly matched to its original specification. TestBook must be used to reconfigure the
immobilisation system.

Conditions
The ECM operates immobilisation in three states:
l 'New'.
l 'Secure'.
l 'No Code'.

Function
With the ECM operating in the 'New' state, TestBook is required to instruct the ECM to learn the new BCU code. If the
ECM is in delivery state (i.e. direct from the supplier), it will not run the vehicle and will store a new ECM fault code
when it is fitted. This code must be cleared after instructing the ECM to learn the BCU code using TestBook.
When the ECM is in the 'Secure' state, no further action is required as the ECM has successfully learned the BCU
code. A 'Secure' ECM can not be configured to a 'No Code' state.
If the vehicle is fitted with an ECM with a valid code, the engine will start and the MIL will go out.
However, if the ECM has an invalid BCU security code the engine will crank, start, and then immediately stall. The
status of the security system can only be interrogated using TestBook.