If you are receiving crank (and cam if it is wired) IRQs (see below), and you have set the Cam/Crank triggers correctly in the System>Engine Driver, then you should now be reading an RPM when cranking, typically of 100-300rpm.


You should also note that the ‘Lost Sync Count’ number should be stable at zero or a low number. (The system will lose sync initially when the engine first starts turning, but once at a stable cranking speed, the number should not continue to increase.)


If the Lost Sync continues to count up, or the RPM intermittently displays, then goes back to zero, then you potentially have noise in the crank/cam sensor wiring - ensure it is shielded at the ECU end only on the wire-in versions, and that the wiring is in good condition on Plug-In models of the ME ECU. You can also try enabling filtering on the inputs in the Engine Driver to clean up electrical noise.


Another test is to make sure you're triggering on the right ‘edge’ (the same as swapping the two wires leading to a crank/cam sensor on older ECUs). Change the trigger edges in the Engine Driver as a test. Note again that basemaps have these set correctly if using our PnP ECUs or Wiring Looms.


Once you have a stable RPM when cranking, and the ‘Sync Status’ DRO reads FULL, you are now ready to carry out the next step, setting trigger offset.

Remember that changing edges or cam/crankshaft types and settings require a power reset for the changes to take effect.

Cam and Crank IRQs

The IRQs DROs for Cam & Crank sensors can be found on the ‘Diagnostics’ tab, as well as on the tree view under Diagnostics.

A good layout is shown in the image below:

IRQs show actual pulses from the cam and crank sensors being received by the ECUs processor. They will always show a pulse count regardless of ANY settings on the ECU - even if you have the cam sensor turned off in the System>Engine Driver, but still have it plugged in, it will record and show the pulses here.

This makes this a useful first test that the Cam/Crank sensors are outputting pulses that the ECU is detecting. If you have a crank/cam sensor connected, and the corresponding IRQ box does not count up as the engine cranks, then you likely have a wiring/sensor issue - there is more info in troubleshooting.