YOUR RESEARCHTacho blip trigering TC fault
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Hi My tacho drops out momentarily, usually when I go over 4k, then triggers the TC to turn off (see poor quality video attached). I'm thinking its not a cluster problem as that wouldn't trigger the TC fault, but maybe the ECU? Am I correct in thinking the signal comes from the crank sensor? Could it be this? I've already googled this one to death and couldn't find anything similar.....
Ignition lock, perhaps? Does ABS remain active in such cases? If yes, then not ignition lock. The tach blip and TC fault have most probably the same cause instead of the blip causing the TC Fault. HTH a little
Quotes source post: 19709657
Yes ABS is active, and yeah quite right the fault is from the same thing
I doubt it�s the crank position sensor because I think your engine would shut off if the signal was no longer detected. did you release the throttle pedal in the video, or the the car close the throttle body by itself? could you continue to drive through it? if you can reliably make the problem arise each time, you could datalog the RPM with a scan tool and see whether the computer is still reviving the signal.
Quotes source post: 19710337
Yes I released the throttle, the car drives fine just no tachometer reading. The problem occurs most of the time on an early morning short commute, less when warm but can still bring it on with higher revs
Okay, now I�m firm in my belief that it�s not the crank sensor. I may be wrong, but I don�t think so. I�m guessing the problem lies with your instrument cluster or its wire harness. Bad ground, or intermittent short- or open- circuit. But it�s still a guess.
Ok, so now I have checked - I have error codes P1340 and P1531 - so likely to be a problem with the vario cam actuator or solenoid which ties in with a rough idle and hunting on startup. Question is - does it relate to the tacho problem - dodgy wiring???
Rodent damage, perhaps?
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