AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 107)

Page 107 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
The sync strategy takes advantage of the missing tooth sections of the trigger wheel.
Missing – Tells the EMS to look for 2 missing crank tooth edges.
MX Sync Test
– Must be set to the number of normal crank tooth edges between missing
edges. In this case there are 57 (really 58 but the first edge is counted as a zero)
MX Time
– Multiplier used internally by the EMS to define the “missing tooth window”
Sync Teeth – Defines the number of cam sync edges between missing crank edges. Note that
on a 60-2 crank trigger wheel (or any missing tooth trigger wheel for that matter that is mounted
on the crankshaft), the pattern occurs twice per engine cycle (2 revs = 1 cycle) so the EMS will
count 1 sync error on the second revolution. This is normal in this case.
Sync Error Reset – Must be set just higher than the number of expected sync errors within one
engine cycle. When this value is exceeded, the EMS will consider the system in fault and
disable fuel and spark outputs until sync can be re-established.
Ignition Phasing and Coil Dwell Discussion