stairforce Posted January 4, 2006 Report Posted January 4, 2006 This is one for the real techies out there! As reported previously, my auto gearbox went into 'limp home' mode on 2nd Dec while we were in Devon. (We live in the Midlands :D ). Since then I have (1) wittered on about it on here ad nauseum(2) acquired a CD (with some Terribly Interesting Subjects on it) :P (3) acquired a cable for the diagnostic port and VAG-COM software to go with it B) I have discovered the location of the transmission control module (between the battery and the inner wing), and checked the wiring from the multiplug to the sensors, as vag-com is reporting faults 281 and 297 (no signal from vehicle speed sensor (VSS) nor turbine speed sensor (TSS)). The wiring checks out OK. The sensors both have a resistance of about 720 ohms as measured on a multimeter. Is this about right? What output should I expect from the sensors (when working OK)? I would expect low frequency alternating current, with the frequency proportional to the engine/road speed, but what levels (i.e. voltage)? Should I get an output from the TSS with the engine running and tranmission in Neutral or Park? Also does it work by varying resistance (and so would need power) or is it a coil placed close to rotating magnetic components? The local dealer admitted defeat before Christmas. It went to a not-so-local main dealer today, who wanted to change the Transmission Control Module [TCM]( Quote
GSMGuy Posted January 5, 2006 Report Posted January 5, 2006 I have had my TCM apart on 2 occasions, both to check general condition, and secondly under a high mag lens to check for soldered joints..... Joint quality was very high as was genral PCB construction and layout.... Remember, the Gearbox ECU is made by Jatco in Japan - They maty be cr@p @ gearboxes, but they know how to solder! :ph34r: Mike Quote
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