Engine management and ECR light on.

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Doodsea

Member
Diagnostics say manifold pressure sensor G71 implausible signal P1158 intermittent. Can anybody please tell me where this is has I can't find any mention of it in the manual
 
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Sorry I do understand which manual.

If you do a Google search 'a2oc manifold pressure sensor' you get a few threads, the 2008 one looks promising.

Hope this helps.

Andy
 
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Andrew said:
Sorry I do understand which manual.

If you do a Google search 'a2oc manifold pressure sensor' you get a few threads, the 2008 one looks promising.

Hope this helps.

Andy
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Thanks Andy. I bought a workshop manual from easy manuals and it doesn't mention manifold pressure sensor. When I Google for it all images seem to show a different engine. Mine is a 2001 1.4 petrol do you know if this is a 1.4 AUA engine and fitted to any other model that may have a decent workshop manual. Thanks for your help
 
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When sensors on the A2 register an intermittent fault, the blame often lies elsewhere in the electrical system. Renewing my ignition leads solved a whole host of such issues on my 2001 AUA A2. The silicone rubber on the original leads was starting to perish and they were quite difficult to remove as a consequence.
 
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steve_c said:
When sensors on the A2 register an intermittent fault, the blame often lies elsewhere in the electrical system. Renewing my ignition leads solved a whole host of such issues on my 2001 AUA A2. The silicone rubber on the original leads was starting to perish and they were quite difficult to remove as a consequence.
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Thanks very much. I've looked all round the inlet manifold and can't find a pressure sensor, do you know if it is part of the egr valve. I disconnected the battery and since refitting the car runs rough and ECR light on
 
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Doodsea said:
Thanks very much. I've looked all round the inlet manifold and can't find a pressure sensor, do you know if it is part of the egr valve.
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The Manifold Pressure Sender is illustrated on P78 of the MM-MPI injection and ignition system (4-cylinder) section of your Easy Manual. Go to p96 for advice on testing.
 
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My 1.4 petrol runs rough when the battery has been removed, and the EML and ECR lights come on. It seems to rectify itself after 15 or so engine start /stops, and the lights go out and the engine runs smooth again..
 
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Hank said:
My 1.4 petrol runs rough when the battery has been removed, and the EML and ECR lights come on. It seems to rectify itself after 15 or so engine start /stops, and the lights go out and the engine runs smooth again..
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Thank you I remember it doing this when the battery was flat, it only lasted about 10minutes then though
 
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Doodsea said:
Thanks very much for your help I've found the information and the pressure sensor
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I was conscious that I had given you the link for the easy manual, so I felt a sense of obligation.

The manual gets easier the more you use it. I keep a 'working' copy on my laptop with all the irrelevant sections deleted which makes it a bit more manageable.
 
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My 1.4 petrol runs rough when the battery has been removed, and the EML and ECR lights come on. It seems to rectify itself after 15 or so engine start /stops, and the lights go out and the engine runs smooth again..

Had exactly the same issues with mine today. Had cause to disconnect the battery and on reconnecting had EML / EPC lights on and various error messages including G71 sensor etc. Rough running and a couple of times the EPC light came on 5 seconds after start up and just cut the engine!! So I cleared the fault codes a few times and after about 10 re-starts the EML / EPC stayed off and no error codes.

Now we all know that A2 electrics can be a bit 'touchy' sometimes - but - does anybody know if there is a logical reason why this happens. I mean I have had cause to disconnect the batteries on lots of different cars over the past 40 years and I can't recall that causing a load of random error messages / warning lights on any of them?? Except the A2.
 
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