sledgeweazel Posted January 1, 2008 Report Posted January 1, 2008 hi can any one help, I have viewed a lot of topics on this type of problem and none of them seem to match the fault codes I have although I found the description of the codes on the seat site. 17957 P1549 Boost Pressure Contr.Valve Short to Ground 17958 P1550 Charge Pressure Deviation17563 P1155 Manifold Abs.Pressure Sensor Circ. Short to B+16485 P0101 Mass or Volume Air Flow Circ Range/Performance can any one help me what to do next my first thought is to reset the codes and see if it was my testing of the circuit that caused them.I thought it was the boost control valve at first, then I found a section on carbon build up in the turbo so I have cleaned the inlet with a spray cleaner after the maff and air filter to see in the turbo was sticking, now I am not sure. a bit of history might help I bought the gal as a cat D and totally rewired the engine bay after a fire, I have run the car for 20k miles no problem other than it taken a long time to start when hot. the turbo recently stoped working intimitanly this hapened last year 2007 while on holiday just as I set off with the caravan in tow but a re-start cured it and it did not happen again but I have put this down to the fact I run the car for a long time over 6 hour journey and it cleaned the turbo out, normally my wife runs it on the school run only about 2miles each way.as of today the turbo keeps cutting out and needs resetting and the fuel usage is up. thanks for reading Sledge Quote
stevie m Posted January 1, 2008 Report Posted January 1, 2008 Mass Air Flow Sensor (G70): Implausible Signal : P0101. I had this code when my mass airflow had gone it may also mean pipe disconnected. Quote
grahaml1500 Posted January 1, 2008 Report Posted January 1, 2008 Refering to the code " 17958 " p1550 "charge pressure deviation" , the diagnostic machine gave me the same code. I changed the airflow meter as advised but still encountering the same problem, all pipes have been checked and ok. I still at a loss as to whats wrong. I will track this post to see if there is a resolve that i can follow. :P Quote
Saif Rehman Posted January 2, 2008 Report Posted January 2, 2008 Refering to the code " 17958 " p1550 "charge pressure deviation" , the diagnostic machine gave me the same code. I changed the airflow meter as advised but still encountering the same problem, all pipes have been checked and ok. I still at a loss as to whats wrong. I will track this post to see if there is a resolve that i can follow. :P 17958/P1550/0054561 17958/P1550/005456 - Boost Pressure Controle Valve (N75): Control Deviation 1.1 Possible Symptoms 1.2 Possible Causes 1.3 Possible Solutions 17958/P1550/005456 - Boost Pressure Controle Valve (N75): Control Deviation Possible Symptoms Irregular behaviour Reduced power output Limp mode Possible Causes Hoses/Pipes incorrect connected, disconnected, blocked or leaking Charger Pressure Control defective Solenoid Valve for Boost Pressure Control (N75) defective Turbocharger defective Possible Solutions Check Hoses/Pipes to/between Components Check Charge Pressure Control Check Solenoid Valve for Boost Pressure Control (N75) Check turbocharger Quote
Saif Rehman Posted January 2, 2008 Report Posted January 2, 2008 sledgeweazel: 17957/P1549/005449 - Boost Pressure Controle Valve (N75): Open Circuit / Short to Ground Possible Symptoms Irregular behaviour Loss of power Limp mode Possible Causes Wiring and/or connections faulty (short circuit) N75 faulty Possible Solutions Check wiring and connections Check / Replace N75 16485/P0101/000257 - Mass Air Flow Sensor (G70): Implausible Signal Possible Symptoms Loss of Power Erratic Idle Possible Causes Mass Air Flow Sensor (G70) faulty Air Leak(s) after Mass Air Flow Sensor (G70) Intake Air Filter dirty/faulty Ground Spots corroded or Paint Residue Wiring and/or Connections from/to Mass Air Flow Sensor (G70) faulty Possible Solutions Check Intake Air Filter Check Mass Air Flow Sensor (G70) Check Ground Spots Check Wiring and/or Connections from/to Mass Air Flow Sensor (G70) Special Notes In MY 1995-2002 (?) in Europe at VW-diesel-cars G70 had the bad reputation of slowly losing his performance, causing loss of power. It's not a matter of defective or breaking down, but it is filthy / dirty (not easy to clean). You can check functionality by making a log in [01-engine], [meas.blocks-08], group 003 (3e gear, full throttle, from 1700-4000rpm) 17958 P1550 Charge Pressure Deviation - As per previous post 17563 P1155 Manifold Abs.Pressure Sensor Circ. Short to B+ - Sorry can't help with this one. Quote
sledgeweazel Posted January 2, 2008 Author Report Posted January 2, 2008 thanks for all the suggestions so far I have tried, checked all vacuum pipes and replaced 2 just in case although I have found it difficult to obtain a detailed drawing of all the pipe connections but I think they are correct, serviced the car and replaced all filters, spray cleaned the turbo with boost, not sure how to check the boost control valve but the multimeter is reading 7v on tickover has anybody fitted a vacuum gauge in the wastegate vacuum pipe, my gut feeling is the turbo vanes are sticking but the other faults are confusing me.is it posible to check if the turbo vanes are sticking or can you move them by hand. thanks again I will clear the codes and try a few suggestions this weekend. Quote
grahaml1500 Posted January 2, 2008 Report Posted January 2, 2008 Refering to the code " 17958 " p1550 "charge pressure deviation" , the diagnostic machine gave me the same code. I changed the airflow meter as advised but still encountering the same problem, all pipes have been checked and ok. I still at a loss as to whats wrong. I will track this post to see if there is a resolve that i can follow. :P 17958/P1550/0054561 17958/P1550/005456 - Boost Pressure Controle Valve (N75): Control Deviation 1.1 Possible Symptoms 1.2 Possible Causes 1.3 Possible Solutions 17958/P1550/005456 - Boost Pressure Controle Valve (N75): Control Deviation Possible Symptoms Irregular behaviour Reduced power output Limp mode Possible Causes Hoses/Pipes incorrect connected, disconnected, blocked or leaking Charger Pressure Control defective Solenoid Valve for Boost Pressure Control (N75) defective Turbocharger defective Possible Solutions Check Hoses/Pipes to/between Components Check Charge Pressure Control Check Solenoid Valve for Boost Pressure Control (N75) Check turbocharger Thanks for the info, been back to garage and replaced maf sensor (again), had all fault codes reset and car seems to be running ok now. Will keep an eye on it tho, just incase.. Many thanks, Graham Quote
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