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Post by Karl on Oct 30, 2014 23:32:13 GMT 1
Ford Focus 2.0 dw diesel
Came in mil on , flags p1335 pcm (egr position sensor performance b circuit) don't have full description With me now
Key on connected I had pin 1 5v ref , pin 3 ground 0.1 v , pin 4 1.4 v supply , pin 5 ground 0.1 v pin 6 1.0 signal
Removed egr was blocked/stuck/frozen
Replaced and dtc clears and retest ok , unable to carry out learn reset
Road test and recheck dtc returns though not mil
Disconnect pcm and and egr load test with 21w bulb
Resistances also checked 0.2 ohms
Pin 4 should be 12 v , so recheck at pcm also 1.4 v
So why isn't PCM providing 12 v ? Has old EGR damaged the pcm transistors
Or should i be looking towards something else
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Post by Noberator on Oct 30, 2014 23:45:04 GMT 1
Ford Focus 2.0 dw diesel Came in mil on , flags p1335 pcm (egr position sensor performance b circuit) don't have full description With me now Key on connected I had pin 1 5v ref , pin 3 ground 0.1 v , pin 4 1.4 v supply , pin 5 ground 0.1 v pin 6 1.0 signal Removed egr was blocked/stuck/frozen Replaced and dtc clears and retest ok , unable to carry out learn reset Road test and recheck dtc returns though not mil Disconnect pcm and and egr load test with 21w bulb Resistances also checked 0.2 ohms Pin 4 should be 12 v , so recheck at pcm also 1.4 v So why isn't PCM providing 12 v ? Has old EGR damaged the pcm transistors Or should i be looking towards something else Is the EGR valve actually closing so the PCM can take control?  Any signs of carbon or a foreign body preventing the valve from fully closing.  |
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Post by Karl on Oct 30, 2014 23:47:32 GMT 1
It's got a new one on there now
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Post by Noberator on Oct 30, 2014 23:53:05 GMT 1
It's got a new one on there now Yes I know but it wouldn't be the first time a new part turns out to be faulty as well. The EGR valve position voltage is greater than the allowable limit when closed and is not being commanded by the PCM hence me asking. |
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Post by Rhubarb on Oct 31, 2014 0:01:21 GMT 1
Can you open up the ECU on these? If not get it tested  |
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Post by Karl on Oct 31, 2014 0:02:29 GMT 1
It's got a new one on there now Yes I know but it wouldn't be the first time a new part turns out to be faulty as well. The EGR valve position voltage is greater than the allowable limit when closed and is not being commanded by the PCM hence me asking. The EGR is commanded by the ground not supply |
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Post by Karl on Oct 31, 2014 0:04:32 GMT 1
Only thing I can think of is maybe an incorrect maf reading
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Post by Rhubarb on Oct 31, 2014 0:06:16 GMT 1
Only thing I can think of is maybe an incorrect maf reading Unplug the maf and then re-check live data? |
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Post by Karl on Oct 31, 2014 0:06:36 GMT 1
Can you open up the ECU on these? If not get it tested I may have to see if can |
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Post by Karl on Oct 31, 2014 0:10:44 GMT 1
It's got a new one on there now Yes I know but it wouldn't be the first time a new part turns out to be faulty as well. The EGR valve position voltage is greater than the allowable limit when closed and is not being commanded by the PCM hence me asking. The box had been opened though which I never like |
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Post by Karl on Oct 31, 2014 0:17:18 GMT 1
Only thing I can think of is maybe an incorrect maf reading Unplug the maf and then re-check live data? I will look at it again with a fresh head next week, but a new PCM is over a grand and need to be sure before I bin it LOL |
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Post by Noberator on Oct 31, 2014 0:21:19 GMT 1
Yes I know but it wouldn't be the first time a new part turns out to be faulty as well. The EGR valve position voltage is greater than the allowable limit when closed and is not being commanded by the PCM hence me asking. The EGR is commanded by the ground not supply Okey dokey.  |
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Post by Noberator on Oct 31, 2014 0:24:09 GMT 1
Yes I know but it wouldn't be the first time a new part turns out to be faulty as well. The EGR valve position voltage is greater than the allowable limit when closed and is not being commanded by the PCM hence me asking. The box had been opened though which I never like Off your Parts Dept or outside source. Any signs it's been used before you and chucked back as a faulty one and slipped the net. |
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Post by Karl on Oct 31, 2014 0:29:36 GMT 1
It's got a new one on there now Yes I know but it wouldn't be the first time a new part turns out to be faulty as well. The EGR valve position voltage is greater than the allowable limit when closed and is not being commanded by the PCM hence me asking. Checking another vehicle and its supply 12 v is switched on/off at key on Mine isn't ? Keep throwing questions at me though as it helps |
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Post by Karl on Oct 31, 2014 0:32:41 GMT 1
The box had been opened though which I never like Off your Parts Dept or outside source. Any signs it's been used before you and chucked back as a faulty one and slipped the net. Nope it was brand new out of the box , they can source from other branches though And faulty parts can do the rounds |
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