Quote:
Originally Posted by Istas
I'm now fairly sure that there is a speedometer cable running from the transmission to the instrument cluster, and that there is a device in the instrument cluster that turns the speedometer cable movement into an electrical signal, that is then sent to the ECU and whatever other devices need it. Which makes me worry once again about the speedometer sticking, and affecting the MPGuino data.
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ECU gets completely different signals for coolant temp, speed, and revs IIRC. If you are still worried, get the vrg3 scanner program that will read your ECU information directly. Your speedo problems are just from the cable slipping, check on the transmission side, many times there is a clip missing that keeps pressure on the cable into the tranny.
Get program here:
legacycentral bbs :: View topic - An ECU scan tool for turbo and NA owners
If the latest version does not work, try the version before that. You just need to modify a printer cable & make a bootable disc/cd for your laptop to get it to work. As a bonus you will get real numbers for coolant temp, load, & injector pulse width, etc... (Injectors do shut off when coasting down in gear above ~1k RPM)
Your doing excellent work so far. I have the AWD turbo version of this car and it laughs at me when I try to get good gas mileage.
