AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 143)

Page 143 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
The screen capture above shows a list of basic timing pattern channels. There are many others
but this list will allow the tuner to confirm the basics. Verify proper main battery power and
ground connections and turn the ignition switch to ON. Connect to the EMS with AEM Tuner
and crank the engine with fuel injectors, ignition coils and fuel pump disabled. View or log the
channels in the list above.
Engine Speed – Calculated engine speed. Should not be zero during cranking. Confirm
reasonable data. Cranking speed can be anywhere from 100 to 300 RPM and depends on
many variables such as: battery voltage, starter type and condition, engine displacement,
compression ratio, etc. A value of 0 for engine speed during cranking means an error in the
timing pattern setup, a sensor error or a wiring error.
Cam Count – Increments by one every time a cam sync tooth edge is detected by the ECU.
Value will count from 0 – 255 and reset. This channel will remain zero unless there edge
selection options turned on for the cam sensor input such as: