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Problem: P120X And P020X Codes

injectors

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#1 cauchy

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Posted 15 May 2014 - 08:48 PM

Hi guys,

 

I have two symptoms with my S-Max 2008 1.8 (1.8L Duratorq-TDCi):

1. From time to time the engine jerks

2. From time to time I get the "check engine" light (I think that it is connected with jerking). Sometimes it takes 500km to get one, sometimes I have two on the distance of 2 km. To date, I have spotted the following error codes: P0202, P1202, P0203, P1203, P1204.

 

I could replace injectors, but it will cost me and I have no guarantee that they are cause. Any ideas? :)

 

Best regards,

cauchy



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#2 jeebowhite

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Posted 16 May 2014 - 11:41 AM

Hi Cauchy,

 

The errors are:

 

P0202 - P0202 means that the PCM detected a fault in the injector or the wiring to the injector. It monitors the injector and when the injector is activated, the PCM expects to see the voltage pulled "low" or close to zero. When the injector is switched off, the PCM expects to see a voltage that is close to battery voltage or "high". If it doesn't see the expected voltage the PCM will set this code. The PCM also monitors resitance in the circuit. If the resistance is excessively low or high it will set this code.

 

P1202 - Injector Circuit Open / Shorted Cylinder #2

 

P0203 - P0203 means that the PCM detected a fault in the injector or the wiring to the injector. It monitors the injector and when the injector is activated, the PCM expects to see the voltage pulled "low" or close to zero. When the injector is switched off, the PCM expects to see a voltage that is close to battery voltage or "high". If it doesn't see the expected voltage the PCM will set this code. The PCM also monitors resitance in the circuit. If the resistance is excessively low or high it will set this code.

 

P1203 -  Injector Circuit Open / Shorted Cylinder #3

 

P1204 - Injector Circuit Open / Shorted Cylinder #4

 

This to me seems like the only cylinder working is cylinder 1. So I would go to the engine and check the wiring past cylinder 1 and make sure its not wet, damaged, or loose beyond this. It might be a simple fix, but as you have an error on injector 2 directly and 3 cylinders, then I doubt that replacing it would resolve the issue. Also check the fuseboard and relays to make sure none of them are wet or damaged.

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#3 cauchy

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Posted 17 May 2014 - 09:27 AM

Thanks for the response.

 

 

 

This to me seems like the only cylinder working is cylinder 1. So I would go to the engine and check the wiring past cylinder 1 and make sure its not wet, damaged, or loose beyond this. It might be a simple fix, but as you have an error on injector 2 directly and 3 cylinders, then I doubt that replacing it would resolve the issue. Also check the fuseboard and relays to make sure none of them are wet or damaged.

 

Actually, I have an error on injectors 2 and 3. Is it possible that one faulty injector generates electrical errors on the other ones? 

 

I have been looking for an link between those errors or the "jerks" and other factors such as the rain, temperature, revolutions, acceleration, length of the ride and found absolutely no correlation. The only thing is that I feel that the problems come in series, e.g., three days when I experience problems, followed by a week without any.

 

Three electricians after inspecting the wires failed to resolve the problem. They suggested replacing all injectors, but this is just a wild (and quite costly) guess.

 

Any other thoughts?



#4 jeebowhite

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Posted 17 May 2014 - 12:57 PM

I suspect if its a wiring fault after cylinder 1, then your likely to see the issue affect the other three so I would check the wiring isnt fraid or is secured throughout.



#5 cauchy

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Posted 18 May 2014 - 07:01 AM

You say that the problem could be after cylinder 1. Do you suggest that cylinders/injectors are wired "sequentially"? What I see when inspecting my engine is that the wires split roughly at one point and go in four directions from there, so I do not see where the point "wiring after cylinder 1" could be. My engine looks like this one: http://www.lyonssyst...0-631-PTIMG.jpg



#6 jeebowhite

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Posted 18 May 2014 - 07:07 AM

It could just be something on the other cable separations. If you have a multimeter it could be an idea to test them all.

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