GMT 900 RPM and TPS signal

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Sep 20, 2016 | 10:03 PM

#11

musclecity85

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From: columbia SC

Quote:

Originally Posted by Three6GMC

gotcha never used the green wire before, for some reason I thought it was blue but I'm sure we are talking about the same wire.

Which controller are you using? Sounds like its fried and back feeding a signal tripping out the computer.

i agree with that, just throwing a signal back into that wire could freak the computer out

Sep 26, 2016 | 08:40 AM

#12

DrX

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From: Canada

Pink is constant 12V. The injector drivers control the ground for each injector, so that is where you will pick up your pulse from.
The controller should provide some kind of input buffer to isolate the TPS signal. Even then, I have found issues with the E38 ECM if whatever is connected to the TPS wiring is powered down before the throttle control system is. In that case it can ground the TPS signal. On E38 the TAC system remains powered for a while after key off. So REP will be waiting for you at next key on.

Sep 26, 2016 | 08:46 AM

#13

Atomic

I have a gauge for that

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From: Huntsville, AL

I would grab a coil circuit instead of an injector for the RPM signal.

Jul 9, 2017 | 08:48 PM

#14

fastsspr

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From: Camuy PR

Quote:

Originally Posted by Three6GMC

I think the tps signal is the blue wire, been awhile since I have tapped into mine... can verify with a volt meter pretty easy and actuating the tb. I grab a tac signal from the main coil connector on the passenger side that the coil harness connects to the main harness at. Top row second wire from the left I believe.

What color is that wire you use to for tach signal? I have a dude what row is the top and what is the button. Thanks