Eric Lemoine Posted June 9, 2009 Report Share Posted June 9, 2009 Hi Ashley, I'm running a Link G3 Plus 2uzfe coil on plug layout in a 97 Supra, and I'm having a bit of trouble with the tachometer. The tach reaches ~5K rpm under power then the tach drops to 0 rpm while the engine revs are still climbing. I've checked the line going to the tachometer and that is fine. The tach itself is a new Pivot Gekko tach and other than dropping to zero at 5k rpm, the tach is working fine. I have two of my outputs set to "tacho" in the ecu, would that be causing the issue? If I have to I can wire the tach directly to one of the coil packs, but I'm not all that sure which signal that tach needs. Thanks for the help! Eric Quote Link to comment Share on other sites More sharing options...
Eric Lemoine Posted June 9, 2009 Author Report Share Posted June 9, 2009 It's worth saying as well that the tachometer is being driven by Aux 4. Thanks! Eric Quote Link to comment Share on other sites More sharing options...
Josh Colombo Posted June 10, 2009 Report Share Posted June 10, 2009 This is from the wiring & installation manual. This may be your problem/fix: "Note: In some cases an external pull-up resistor will be required to drive the tachometer. If the tachometer fails to operate, operates erratically or will not read over a certain RPM, connect 1 kOhm 0.25 Watt (1000 Ohm ¼ watt) resistor between the tacho signal wire and its power supply. Also check that the auxiliary output is configured to have the correct duty cycle in PCLink." Josh Quote Link to comment Share on other sites More sharing options...
Eric Lemoine Posted June 13, 2009 Author Report Share Posted June 13, 2009 The problem is solved. Turns out the duty cycle was too low. Ramped it up and the tach works fine. Thanks to Watr from NZEFIfor pointng me in the right direction. Eric Quote Link to comment Share on other sites More sharing options...
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