AMP EFI MS3Pro - Missing Tooth Crank Wheel and Single Tooth Cam Wheel

5.3 Ignition settings 5 SETTING UP A BASIC CONFIGURATION
• Trigger wheel arrangement = Single wheel with missing tooth
• Trigger wheel teeth = number of teeth including missing teeth
• Missing teeth = set according to your trigger wheel
• Tooth #1 Angle (deg BTDC) = set as above
• Main wheel speed = Cam wheel
5.3.4.8 Missing tooth crank wheel and single tooth cam wheel This is an very common arrangement that
supports full sequential and coil on plug. (For 50/50 type polled cam wheels, see the next sub-section.)
The definition of tooth#1 is the same as the basic missing tooth crank wheel and should be phased in the same
way. Ensure you also read the section above. 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 pulse only per engine cycle.
The cam signal is a single pulse, usually generated by a narrow tooth, vane, or window. Technically, it is edge
triggered. For VR type sensors, the edge setting will depend on the wiring you use (typically Rising) as the signal
is a very short pulse. For a hall type sensors you need to ensure that the edge you choose matches up with the
phasing as below. To confirm correct cam sensor phasing proceed as follows.
First, set your engine at TDC compression #1.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 69