Originally Posted by torqueisking

I've found some conflicting info about EWS4. One POV is as you've noted - crank = EWS4 ok, no EWS4 sync - uses handshake. The other says that the CAS controls cranking and the DDE controls fuel so the CAS can recognize the key and allow cranking but if it doesn't return a valid value to the DDE based on the encryption key, it won't start the engine.

And there's more conflicting info! When I check the EWS status using the DDE73 script in INPA, I receive a "RELEASE OF IGNITION AND INJECTION ISSUED (CHALLENGE RESPONSE SUCCESSFUL)". Great but recently a single 4C18 error code appeared in the DDE error memory which indicates that there is a problem with the receipt of the terminal 15 based message from the CAS. I guess I believe the latter because it won't start!

That fault doesn't appear when reading the errors via "functional jobs". No faults shown in that report, the CAS or EWS4 error report.

Rheingold on the way...hope that helps.