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Diesel ECUs


Diesel ECUs were introduced to the market in the early 1990s by such vehicle manufacturers as Audi, BMW, Mercedes, VW. The systems used were exclusively supplied by Bosch and replaced what would have previously been a totally mechanical injection system. Proportionally diesel vehicles were in a minority at this time within the UK and hence the demand for ECU testing and remanufacture was limited. 

ATC introduced its first diesel ECU programme in 2004 with the MSA12, which was used by BMW / Rover. Early ECU testing was confined to the manually operated test rig with modifications built on to accommodate the additional loads required for diesel ECUs and the measuring of the outputs. 


As the various ECU technologies of diesel vehicles began to grow, there was an increasing requirement for diesel ECU testing. To meet this demand ATC began designing tests using our automated ECU testing system, the Network 500. The first diesel programmes being the Bosch EDC15C2 / C3. 

Initial results demonstrated an overwhelming number of diesel ECUs (Over 80% of those tested) were found to be not faulty. This was around 20% higher than petrol equivalent numbers. 

More ECU manufacturers started to develop diesel ECU systems, with vehicle manufacturers such as Ford, Peugeot & Citroen beginning to use the Siemens diesel ECU systems (SID) which had peizo controlled injectors rather than the usual solenoid injectors. Primarily used in the 1.4 & 2.0 PSA engine vehicles from around 2002 onwards. 

The testing of diesel ECUs was taken to a new level in 2011 with the introduction of ATC’s new universal electronic module test system, the PTM820e. This has increased the testing capability of diesel ECUs to include later Bosch, Siemens, Magneti Marelli and Denso diesel systems. 

ATCs current range of diesel ECUs exceeds 1500 original equipment and vehicle manufacturer part numbers with prices from £125 plus VAT. 

How long will the test / repair take ?

We would normally test and diagnose the failure on the day the item arrives with us. A repair should be completed within 3-5 working days of being given the go ahead to proceed. (This will Vary depending on the unit. We can give you an estimated time of completion over the phone or email.

Getting it to us

If you need to have your Diesel ECU tested and repaired then please contact us by phone or alternatively complete the ECU testing form and print a copy to enclose with the goods.  ATC offer a competitively priced collection service using a national courier to save you the time in  having to arrange shipment to us. Simply select the “collection” option on the bottom of the form.  You will still need to pack the item(s) safely and securely with our name / address clearly marked.  We would expect to contact you and advise you on which day the collection will take place.

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