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Common ECU faults:
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Fiat common ECU failures
Fiat ECU list
Common fault with key coding due to lost or dammaged red master key

Fiat Punto 1.2 litre IAW 59F ECU year 2000 onwards

The Magneti Marelli IAW 59F range of ECU are a very common failure for all Punto 1.2 2000 - on. When the ECU fails it causes the engine to misfire on two cylinders

We can no supply Brand new Punto 1.2 ECU’s with an unlimited mileage 2 year warranty.
Part numbers:
IAW 59F.M1
IAW 59F.M2
IAW 59F.M3
IAW 59F.M5
IAW 59F.M7
IAW 59F.SC

£125 + postage
Call 01773 535638 9am-6pm to order

Fiat Punto 55 1.2ltr 8 v 1995 - 1998

Engine management light comes on then engine revs up or fluctuates.

A fault caused by a faulty temperature sensor located in the corner of the inlet manifold - gear box side. These sensors suffer from dead spots in the linear operation of the sensor at certain temperatures as the coolant heats up, this causes the ECU to think that the engine is running colder than it actually is and therefore adds more fuel and a higher idle speed to compensate. The sensor should be replaced and the two short lengths of wire that connect to also.

Fiat Bravo, Brava & Marea 1.8 16V 1995 - 2000

Engine will not  start or runs rough-
The Hitachi MPI ECU systems fitted to the Bravo, Brava & Merea are already showing signs of having common faults with the ECU.
A lot of the problems appear to be key code mismatch fault where the ECU loses the key code and will not run the engine. we can supply these units coded to the vehicle or independent of the immobilizer system, meaning they can be plugged straight in.
Part. No’s.
046 422 1570
046 422 4580
046 459 2650
046 435 3010
046 422 5210
These units are available from £195.00

Fiat all models 1993 - 2004 onwards

Emission Failures -

High CO & low lamna reading.   common causes of rich running faults are the lamna sensor or the ECU (engine control unit) both of these parts are relatively simple to check, to check the sensor strip back the insulation on the signal wire from the lamna sensor, this wire is usually black.  Then hold the bare wire between your finger and thumb then touch your other hand on to the battery positive the internal resistance of your body will give 1volt at your finger tips which is what the sensor would give out when the engine runs rich, if the emissions come down then you have a faulty lamna sensor or wiring but if the emissions remain the same then the ECU is a possible fault. For more information on ECU testing click on ECU

High CO with normal lamna reading. If the oxygen level is below 1% then a high CO with a normal lamna reading can only be one thing - the catalytic converter, when ever you get this reading the catalyst should be condemed. But always make sure you check the oxygen level first, if its high (over 1% at speed) then you’ve got a leaking exhaust or engine runing problems.

Fiat all models 1986 - onwards

Hessitation, power loss, missfire. This type of problem can be one of the most time consuming faults to find because the problem often is only slight and the fault only shows up when the car is being driven under load. One common cause of this is a fouled or sticking injector.