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Re: Ignition coil low reference circuit
Posted to Technical Theory Forum on 6/18/2016 7 Replies

Joe, this morning I had a 2011 GMC Terrain in the shop and I grabbed a waveform from the ignition system. The red trace is low reference and the other two are the IC signal for cylinders 1 & 3. I am pinned in at the PCM connector.

The wiring diagram shows al... Login to read more.

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