5.3 Ignition settings 5 SETTING UP A BASIC CONFIGURATION
The definition of tooth #1 is the same as the basic missing tooth crank wheel and should be phased in the same
way. The cam input tells the code which engine cycle/phase it is on. From the crank wheel alone the code knows
when cylinder one is at TDC, but it cannot distinguish TDC compression or TDC exhaust. The cam sensor adds
this information which is why it needs to be one "tooth" only per engine cycle.
At close to tooth #1 the code examines the voltage level on the input to determine which phase it is on -
the "tooth" should be normally start at least 20 crank degrees before tooth#1 and continue for another 20 crank
degrees afterward. (The level is actually polled at tooth#2.)
To confirm correct cam sensor phasing proceed as follows. First, set your engine at TDC compression #1.
Now rotate the engine backwards to tooth #1. The cam sensor should be roughly in the middle of win-
dow/tooth/vane. With the cam sensor powered and connected to the MS3Pro, measure the output voltage. When
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 72
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