Peugeot 206 1.4 2003 - ECU Failure Peugeot 206

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Mon 14 Jul 2014 06:13
Peugeot 206 1.4 2003 - ECU Failure Peugeot 206 - RonYork

Would appreciate any advice ~

I have a Ref 2003 Peugeot 206 1.4 petrol engine with a Sagem (9646988680 / s2000A) ECU

The car starts first time and runs ok - except for a slight intermittent misfire and high emissions in the form of wisp of black smoke when it starts - this reducing but not completely going when driving. The car drives well at speed, has power, does not stall and the slight misfire is hardly noticeable when driving

I can probably resolve the emissions and misfire with new air filter, Co2 / MAP Sensor and Coil pack ~ but there is a fault with the ECU that I would appreciate some advice with

When ignition is turned on on the dashboard ECU light comes on ( which it should ) ~ The ECU light goes off when the engine starts - and stays off, even when the Co2 & Map sensors are disconnected - which is a fault which should show an ECU light on the dash board ?

So the ECU is not showing these faults ~ as ECU dash light stays off when engine is running and shows no faults indicated when connected to a diagnostic tool?

Has the ECU failed ? Many thanks - Ron

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Mon 14 Jul 2014 08:31
Peugeot 206 1.4 2003 - ECU Failure Peugeot 206 - elekie&a/c doctor

Unlikely.The faults may not show immediately .The car may have to be driven a fair distance for the system to log any problems.Also your diagnostic tool may not be accurate enough.

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Mon 14 Jul 2014 14:34
Peugeot 206 1.4 2003 - ECU Failure Peugeot 206 - Railroad.
The chances of the ECU being faulty are slim to none. A much more likely cause of a misfire on this model is either a spark plug or coil breaking down, or a faulty fuel injector which are fairly common. Disconnect each injector in turn to determine which cylinder the misfire is on. Then swap that injector with another to see if the misfire moves with it. If it does then the injector is at fault.
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