Markie Posted May 28, 2013 Share Posted May 28, 2013 Hi all, Had the problem twice now. Car will start but engine management stays lit and even with pedal full on I get tick over revs.. Turn off and try agai. And things back to normal.. Any ideas? Is there some FBW sender unit or something that can play up or go? Quote Link to comment Share on other sites More sharing options...
listy Posted May 28, 2013 Share Posted May 28, 2013 TT? NA? Vvti? Non vvti? Iirc only the vvti has FBW, but I may be wrong. Quote Link to comment Share on other sites More sharing options...
Markie Posted May 29, 2013 Author Share Posted May 29, 2013 (edited) Yeah, TT VVTi Sure there used to be a code trick you could do even with the VVTi's but its been years since I tried that. Code thing for using the engine management light and the diag socket. Edited May 29, 2013 by Markie (see edit history) Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted May 29, 2013 Share Posted May 29, 2013 Paper clip in pins Te and E1 to read the codes. Quote Link to comment Share on other sites More sharing options...
Wez Posted May 29, 2013 Share Posted May 29, 2013 Is the car stock or do you have any aftermarket electronics fitted? Quote Link to comment Share on other sites More sharing options...
Alex Posted May 29, 2013 Share Posted May 29, 2013 Sounds like it's in safety mode...I had this before. Mine would go into limp home mode during a journey. Although I never found what afflicted mine I'd say you need to get the OBDII codes read (if I recall correctly the vvti doesn't work with the pin shorting method of getting the codes). I would expect that a sensor is not working properly. Or the Throttle Body needs stripping and cleaning. Quote Link to comment Share on other sites More sharing options...
Markie Posted May 29, 2013 Author Share Posted May 29, 2013 Would it be MAF sensor cleaning as well? Or do you think Throttle Body? I was wondering if there is a FBW sender unit or something which is known to play up. Thinking about it, the other day it did start reving higher than normal tick over when just left running for a few minutes.. Like as if the AC had been turned on. Quote Link to comment Share on other sites More sharing options...
Alex Posted May 29, 2013 Share Posted May 29, 2013 The VVT-i's electronics are more advanced and more interlinked...so I don't think anyone will diagnose it without the OBDII codes being read. But yes it could be the MAF...or the coolant flow...or the DBW TPS or the crank position sensor or a bad earth or.... Cleaning the MAF isn't really possible...too easy to damage it further I would guess, I don't know if anyone else knows. Quote Link to comment Share on other sites More sharing options...
Markie Posted May 30, 2013 Author Share Posted May 30, 2013 Just read the codes off the car.. Getting 3589 pause 3589 pause etc etc Anyone know what the codes are? Is it code 35 and 89 or is it 35 89 times its been flagged? Quote Link to comment Share on other sites More sharing options...
Alex Posted May 30, 2013 Share Posted May 30, 2013 There's a 4 sec pause between numbers. code 35 and 89 are interesting so is 358 + 9 http://www.obd-codes.com/trouble_codes/ Quote Link to comment Share on other sites More sharing options...
Markie Posted May 30, 2013 Author Share Posted May 30, 2013 You've lost me :-) I can't recall a pause between numbers at all.. I'll re-check Quote Link to comment Share on other sites More sharing options...
Markie Posted May 30, 2013 Author Share Posted May 30, 2013 Yeah defo 35 and 89 then... Is that sensors then looking at the codes or? Was hoping the code would be something more like replace this or replace that Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 30, 2013 Share Posted May 30, 2013 There's a redundancy pot (two pots) on the pedal, and a redundancy pot on the TB. One or more will be sending false signals to the ecu, either because a pot is faulty, a connector is faulty, or the loom is faulty. If the signal from the 2 pots don't agree the ecu sees trouble and goes to safety mode. FBW is a PITA. Quote Link to comment Share on other sites More sharing options...
Markie Posted May 30, 2013 Author Share Posted May 30, 2013 (edited) Thanks Chris... Any pointers of where exactly these "pots" are so I can do some basic checking? How did you come to these units from the error codes.. They sound like two different things.. Ahh these things? throttle body potentiometer I'd hope it's not loom Edited May 30, 2013 by Markie (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 30, 2013 Share Posted May 30, 2013 One pair is on the acclerator pedal, the other pair on the throttle body. The "pairings" are in one housing. You *MIGHT* get away with a multi meter that reads Ohms and volts. Measure the resiatnces as you get someone to slowly press and release the acceleratotor. Also measure the voltages at the ECU (0 to 5 volts or very close), If you are not confident get someone who is to do it. You just *COULD* knacker the ecu. Google Motec webinars, and on YouTube, they may have a webinar on checking FBW stuff, not sure. Quote Link to comment Share on other sites More sharing options...
chrispot Posted May 31, 2013 Share Posted May 31, 2013 One pair is on the acclerator pedal, the other pair on the throttle body. The "pairings" are in one housing. You *MIGHT* get away with a multi meter that reads Ohms and volts. Measure the resiatnces as you get someone to slowly press and release the acceleratotor. Also measure the voltages at the ECU (0 to 5 volts or very close), If you are not confident get someone who is to do it. You just *COULD* knacker the ecu. Google Motec webinars, and on YouTube, they may have a webinar on checking FBW stuff, not sure. the accelerator pedal pots are on the throttle body and are operated by the throttle cable ( most cars that are DBW have the acc pots on the throttle pedal), first thing I would do is clean the multi plug on the throttle body, as I had problem with my car (supra vvti) sitting at the traffic lights when the mil light came on and lost the DBW control, which then only gives you about 1/4 throttle which you get from the throttle cable. I cleaned the multi plug and its never happened again. good luck and regards Chris Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 31, 2013 Share Posted May 31, 2013 Apologies, you are of course correct. On the MKIV VVTi the pots are all on the throttle body, getting confused by a Subaru I just had in, where it has throttle pedal and separate throttle body pots. Some generic info on "fly by wire" here: http://www.picoauto.com/applications/electronic-throttle-control.html Quote Link to comment Share on other sites More sharing options...
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