Post by
VStar650CL »
https://forums.nicoclub.com/vstar650cl-u299034.html
Fri Jun 26, 2026 4:31 pm
The ECCS Relay is set up such that the ECM has to turn itself on. It's arranged that way so the ECM can wake itself up to check fuel tank evap integrity while the car is parked. Since the relay worked on the bench and the car woke up when you jumped it, that means the relay has power, and since the coil and one secondary throw operate off the same fuse, that means power isn't the issue and chances are the ECM or the wiring is the culprit, not the relay. The relay coil will have constant battery power on one side (check which with the relay removed), then the ECM grounds the other side to turn it on. So, with the relay installed, try jumping ground to the pin on the relay which connects the coil to the ECM (that will be the coil pin which doesn't have power when you check with the relay removed). If that wakes the car up, it means the ECM can't (or is refusing to) turn on the relay.