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Registered:
May 2002
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1ggze speedo input?
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Fri, 11 June 2004 01:39
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Does a 1ggze which was origninaly an auto and has been converted to a manual require the speed input signal from the back of the speedo to stop the computer going into limp home mode ?
Does it maybe use this signal to switch the supercharger on off points ?
thanks
jamie
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Location:
Canberra
Registered:
May 2002
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Re: 1ggze speedo input?
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Sat, 12 June 2004 06:38
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Hi Jamie, seeing as no one has yet replied, let me share my experience with you. Sorry it is not direct 1GG-ZE! Both 1G conversions I have done did not go into limp mode, without signal from Auto. One was a 1GG-FE, and the other was a 1GG-TE. The other conversion with a 1JZ-GTE, also had no limp home problems when connected to a manual box.
From my understanding of the Toyota SC, they are switched by engine speed, on at RPM greater than 1800, and vacuum/boost air valves, and TPS ie. over run with boost still available would be a bitch!. Hope this helps in some way.
regards Chuck.
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Registered:
May 2002
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Re: 1ggze speedo input?
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Mon, 14 June 2004 22:25
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Thanks Chuck
I will let the boys know to give it a go without this connected,..
much appreciated for your reply
Jamie
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Location:
PNG
Registered:
June 2002
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Re: 1ggze speedo input?
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Mon, 14 June 2004 23:32
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Jamie
Like Charles I have not done a auto conversion, but have done a manual (1ggteu). Also like Charles I do not believe that the speed sensor has any effect on the auto. I do have a engine manual for a 1ggzeu and there is no mention in the diagnostic codes that indicates any concern. The translation of these codes are in the Tech Docs section on this site.
From what I can determine the speed sensor has three effects (note the signal is obtained from a sensor actuall connected to the speedo). One, once you exceed 3,000rpm for a given period of time - I think it is 30 seconds - the engine check light will come on and store a diagnostic code to this effect. Second, the computer seems to use the speed to determine if the vehicle is still mobile 'cos when it does not get a speed reading when you take you foot off the throttle it gives the faintest beep, - possibly read idle up - to stop the engine stalling. This is not a real problem and is still hard to detect, but now I have told you will annoy the hell out of you. AND three, speed cut @ 180kph.
I have used a cruise control sender connected to the tailshaft to provide the signal to the computer. This solves all of the problems including the spped cut as the signal is only 25% of that of the factory setup and u would have to be doing 720 kph.
Hope all of that helps.
Craig
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