 | Home > Puma (Tdci) > Electronics will kill us all..... Fault codes and non start. |
 
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6588   
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I think you've got something affecting the sensor voltage circuit (P0642), the knock-on effect is the turbo position sensor is giving back the wrong value.
Not sure this would prevent start, but would certainly make running difficult - and aren't right. Found this on a South African forum: https://www.4x4community.co.za/forum/showt...utive-days I would start by unplugging all the devices on that sensor supply circuit - EGR valve, turbo and MAP sensor. Clear the faults, if they stay cleared then one of those devices is to blame. Plug in one at a time and see which triggers the fault. Or if the faults reappear immediately with them all unplugged then this suggests a loom fault, or less likely an internal ECU fault. I would then look at unplugging the black ECU plug (the engine loom one) and checking continuity of pin E4 to the MAP or turbo actuator, and also for shorts to ground etc.  1988 90 Td5 NAS soft top
2015 D90 XS SW |
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4th Feb 2023 10:32pm |
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| Toplink Member Since: 05 Dec 2010 Location: Somerset Posts: 159
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Thank you for that Martin. Its never over in my land rover.
2007 Defender HTop. 1952 Series One 80" 1977 Muir-Hill 111. 2014 Triumph Tiger800xc 1999 Discovery 2 td5 1982 Ransomes TSR300D. 2002 Yamaha XT600e. 2010 Freelander2 (the wifes) 2008 John Deere X140 |
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4th Feb 2023 10:37pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6588
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For clarity, I do mean the MAP (manifold pressure) sensor on the engine not MAF (air intake flow) sensor on the air box.
1988 90 Td5 NAS soft top
2015 D90 XS SW |
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4th Feb 2023 10:38pm |
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| Toplink Member Since: 05 Dec 2010 Location: Somerset Posts: 159
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Again thank you Martin.
Followed your advice cleared codes. Looked at MAP sensor and yes small hole in it where label had come off. Put the old one that I had kept back on starts runs test drive all good no Fault codes. Can not believe it was literally staring me in the face. Electronics always give me dread and a mental block. Its never over in my land rover. 2007 Defender HTop. 1952 Series One 80" 1977 Muir-Hill 111. 2014 Triumph Tiger800xc 1999 Discovery 2 td5 1982 Ransomes TSR300D. 2002 Yamaha XT600e. 2010 Freelander2 (the wifes) 2008 John Deere X140 |
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5th Feb 2023 1:40pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6588
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Excellent. The big benefit of electronics is they monitor what’s going on and can report back what the problem is.
So here it was the old MAP dragging the sensor supply voltage down, triggering the first fault. The second fault triggered because the turbo actuator didn’t have enough voltage for the output position feedback signal to be sent at all, or be sensible. The fault codes help out massively 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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5th Feb 2023 2:56pm |
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| steveww Member Since: 05 Jan 2022 Location: Uppingham Posts: 559 
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I knew what I was doing with carburettor and distributor, there was so much less to go wrong. With the new electricery one misbehaving sensor can cause all sorts of chaos.
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6th Feb 2023 11:14am |
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