ECU diagnosis

An increasing number of jobs refered to us are for ECU diagnosis.

This is often due to the expense of the new unit, or to confirm the diagnosis of another garage.

We can't test ECU's on site, but there are a number of tests that can be carried out, these tests simply prove what its not, until you are left with what it is. In many cases the ECU.

Due to the coding and immobiliser functions within modern ECU's it is sometimes better to repair the old unit.

A few simple procedures such as a global scan, for codes in all modules, not just the suspect ECU or modules as they are now known.

Check power supplies, grounds and primary signals if these are satisfactory then it's a good chance the ECU is at fault.

Many of the vehicles we test for module failure have wiring and connector faults, not ECU failure.

In this case a Landrover was refered to us for a second opinion, the owner did not trust the diagnosis or the the repair estimate.

A quick scan of the modules (results shown above) produced a number of codes.

Checking grounds, connections and lives proved satisfactory, all the primary signals to the ECU were present however there was no injector output.

As it was the holiday season, the ECU repair facility sent a un-locked ECU for the owner to use over the holidays. The repair will prove less costly than the new ECU the owner was quoted by the previous garage, plus having seen for himself that a replacement unit has fixed the intermittent non start he was more than willing to trust our diagnosis.