- VR+ to Speeduino VR+
- VR- to Speeduino VR-
- Shield to Speeduino power ground
Shield to Speeduino power groundSpeeduino power ground it's like battery ground ?
PSIG wrote:That's fine. Each power ground wire should be run separately from the ECM to the star ground on the block and not spliced before. The chosen ECM sensor ground terminal does not go to the block.I don't have plug on transmission. I only have wiring harness on engine. No cluster, no alternator, etc..
Ensure the chassis and any other grounding point for devices other than the engine block (instrument panel, transmission, etc) have good ground straps to each other and the block to carry ground current, so ground does not try to go through the ECM to get to the device. A typical car will have many part-to-part ground wires or straps for this purpose. This is why we ground at one point, so the ECM ground wires are not accidentally used to pass ground to other parts of the vehicle or chassis, affecting ECM electrical and signals.
The dashed lines on the PCB layout are connected, but not shown. Commonly by ground layers, copper fill, or other that is not an obvious trace.
Jason Rouillard wrote: ↑Sun Mar 24, 2024 5:50 pmI tried without sensor, with filter, with rising/falling and with a signal from my ICM and i has all of time same thing.Exactly. Keep in-mind, the Tooth Logger and the Composite Logger give different info. The Tooth Logger only shows time in any condition, high or low. So, the longer it is low, the taller the bar, and the longer it is high the taller the bar. Yours is a good example of the effects, and how the timing only shifts, as either high or low signal, Rising or Falling, the duration (time) of the wide teeth and gaps are the same, inverted or non-inverted. A Composite Log would be different info.
I've managed to dig up a few obscure wiring diag[…]
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