AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 144)

Page 144 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
Crank Count – Increments by one every time a crank 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:
Stat Sync’d – Turns ON when synchronization criteria are met. This channel should be off
when the engine is not cranking. It should turn ON during cranking and depending on the timing
pattern, it may take up to two engine revolutions. If it remains OFF during cranking or flickers
OFF/ON, there is an error in the timing pattern setup, a sensor error or a wiring error.
Crank Tooth Period – The measured time in milliseconds between crank tooth edges.
A Tooth
– See Tooth Control Table description in Timing Pattern Basics section above.
Fuel Tooth – Increments when the ECU detects a “Fuel Tooth” edge. See Timing Pattern
Basics section.
Cam Tooth – Increments when the ECU detects a “Sync Tooth” edge. See Timing Pattern
Basics section.
Sync Errors – Increments when a sync error is detected. Note that sync errors are normal for
certain timing patterns. See Timing Pattern Basics for more information.
Timing Errors – Increments when the ECU sees the wrong number of fuel teeth between sync
teeth. A small number of timing errors is normal during cranking but this channel should not
continue to increment during normal cranking or running conditions.
The following PC log example data was collected running a 60-2 crank trigger pattern with 12
fuel teeth and no sync teeth. Note the Crank Tooth Period
“bumps” when the ECU detects the
missing tooth section. A larger value for period corresponds to a larger distance between
edges.