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Peugeot 206 HDI 2.0L 2001 ECU warning light issues

Hi all.

I own a Peugeot 206 2.0L HDI diesel, that has an intermittent problem I am keen to solve without paying money to the garages.

Basically in the past year I have had three occurences of the following where the ECU warning light has illuminated in the dashboard.

Basically it happens like this.....

I have a hard sporty driving style where I like to accelerate hard, putting pedal to metal so to speak and of course brake hard.

I have been known to stay in 2nd or 3rd gear say and go up to high revs of between 4,000 to 5,000 rpm before I change up to the next gear....

The ECU dashboard warning light has illuminated on three occurrences over the past year when I was accelerating hard and doing between 4,000 to 5,000 RPM.

On the first occurrence of the ECU warning lamp illuminating, this was the only symptom. The ECU light went out about 3 days later. The engine performance was not affected.

On the 2nd occurence, I was driving on the M1 between J14 and J15. The engine basically temporarily lost some of its power, it was like as If I had lost the turbo and lost all acceleration. However, the engine was back to normal a couple of miles back down the road when I got off at J15.. The ECU light went out 3 days later.

On the 3rd occurrence, which was last Sunday, I was accelerating hard with high revs in 3rd gear, when the ECU warning light came on. The ECU basically forced the engine into a "limp home" mode where I continued with my journey unable to go any higher than 2,000rpm and had crap acceleration. It was as if the turbo had been turned off.. I got to work for 8.15am. I then finished work at 8.00pm and the engine performance was back to normal. The ECU light went out tuesday morning.

I thought that if the ECU warning light came on, it had to be manually reset by connecting a diagnostic tool to the OBD port and clearing the memory of the fault codes. In the above cases, the ECU seems to be resetting itself automatically after a few journeys over 3 days.

Does the ECU keep a history log of what the fault codes were, or do they get deleted automatically once the ECU light goes out?

Is it worth my while getting an engine diagnostic unit that can be used with a laptop so I can find out what the fault code is and then fix the fault once I know what the fault code is?

Now clearly there is a problem developing somewhere, as each time it shows new additional or extended symptoms. Anyone got any ideas as to what the cause is? I've had various suggestions as to the fault:

  1. faulty crankshaft position sensor,
  2. faulty/dirty air mass flow meter
  3. the common rail being low on pressure, and is due to blocked fuel filter or faulty fuel tank pump
  4. the throttle butterfly is sticking, and hence the throttle position sensor is reporting a value that the ECU was not expecting when compared to the accelerator position sensor

I do not want to replace components on mere suggestion. I would rather find out what the exact fault is so I don't end up replacing perfectly good components.

Looking forward to the replies,

Stephen

Reply to
Mallory
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Afew things worth mentioning with the 206 HDi's and in general...

a) Yes the ECU does retain the fault code for (off top of head) 10 drive cycles. b) The initial fault was only minor since it did not enter LOS mode, but in the last case it did. c) Upto roughly the 03 MY 206 which went onto use the gen II Canbus wiring, electronic glitches are fairly common! d) The actual fault could be induced by your driving style and is mostly likely to be a slightly out of tolerance AMM or turbo wastegate, leading to an unexpected signal or an overboost situation.

e) the first course of action would be to have the ECU codes read, cleared, and re-read the next time the light comes on and go from there.

Hope this helps.

Tim..

Reply to
Tim..

Do you keep your foot hard against the stop?

A friend of mine had a similar problem while accelerating after much head scratching it was found that in her eagerness to "go fast" she jiggled her foot around on the throttle not so much as you'd feel it jerking about but it was enough to make the engine think it had a faulty throttle sensor.

Tom

Reply to
Tom Burton

update:

I managed to get a "snap-on Tools" EOBD reader onto my car.

Basically there are two error codes that came up on the diagnostic reader:

P1112 Fuel Rail Pressure and P0191 Fuel Pressure Inconsistency.

Bearing in mind that this is a 3rd party diagnostic reader where you have to put in the car make, model and year etc, I decided to google for the meaning of the error codes and reveal that P1112 is "High pressure is lower than minimum pressue and that P0191 is Fuel Rail pressure sensor range/performance.

The error codes have now been cleared..... I am not sure if the two error codes have a common cause or if they are separate faults.

incidentally, all three occurences of the ECU light coming on has been in the first five minutes of driving from a cold start

Keep the answers coming!

Regards

Stephen

Reply to
Mallory

So there;s insuffecient pressure at the fuel rail. Which means either the pumps unhappy or the fuel lines constricted or , I suppose , just possibly, your fuel filters clogged or not an OEM one. (Or Bosch or Lucas, who make all the OEM ones)

Reply to
Duncan Wood

Indeed- first job would be replace the RPS and try it. These are about £35 so cheap enough. I reckon the HP pump is struggling, or its check valve is sticking.

Tim..

Reply to
Tim..

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