Folks,
I'm getting the E4 error. I opened the controller and looked at the soldering. It seems OK, nothing seems broken. Is a bad solder connection too subtle to see, or is it very obvious?
Sensor input and output voltages are within spec, but it doesn't behave exactly as the service manual states:
According to the manual, page 7-91, I'm supposed to turn the main switch to ON, wait for 10 seconds, and test output voltage. However, I only get output voltage (0.92V) when the main switch is in the ACC position. Does this mean I have a bad CLASS Controller? What else could be wrong?