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Robert
Robert, UK Qualified Car Technician
Category: Car
Satisfied Customers: 4566
Experience:  Fully qualified / self employed garage technician in the UK
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Just been told problem with my E270 is ecu unit. garage

Resolved Question:

Just been told problem with my E270 is ecu unit. garage originally said high pressure pump and replaced it but it didnt fix fault. Sent car over to diesel engineers who have now said its the ecu.... would the high pressure pump have been damaged by the ecu as i have been told by the garage or was the replacement of the high pressure pump unnecessary (costs standing at £600 and still no working car!). Would appreciate your advice before having to pay out any more!
Submitted: 1 year ago.
Category: Car
Expert:  Robert replied 1 year ago.

Hi..there..

The high pressure pump is run off the camshaft so it basically mechanical providing fuel pressure to the rail.so its not controlled by the ecu really..the engines a common rail diesel..so the ecu would only control the injectors/monitor pressure sensor etc....unless the HP pump was leaking ie: seals or not providing enough fuel pressure to the rail then it would have to be replaced....if its been diagnosed as ECU failure..then there should be no reason to replace the HP pump..sounds like you may have encountered miss-diagnoses...

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Customer: replied 1 year ago.
i believe it must be a misdiagnosis too ....it occurred to me that 4 days before the car broke down the electronic key stopped working so we replaced the battery. having looked up issues with the ECU i have seen comments with regard to the electronic key so am wondering if there may have been a connection between the breakdown and the key as it seems quite a coincidence. if it is the ECU is this a major repair to carry out and is it costly? i cannot really afford to pay out any more money - having already a bill for £600 without the problem being resolved - so i will need to make a decision as to whether to go any further with the repairs.
Expert:  Robert replied 1 year ago.

Hi sorry for the delay didnt see you had replied back..

You could down the route of having the ecu sent off for inspection or repair..that maybe something to look into.... if you google.. ( ecutesting ) or ( bba-reaman) maybe have a word with them and see if they can help you out..you will have have the ecu removed before you can send it off..and maybe alot cheaper..saving having to reflash a new ecu to the car etc

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