Codes de défaut couverts
66-41
The PCM commands the VFD to close a relay in the power circuit during VFD initialization. If PCM senses the VFD relay coil is open this code is set. While this code is active the VFD will not be powered and system is inoperable. 12VDC is fed from Pins 6&7 of the PCM into pins 5&6 at the VFD via communication cable as long as system is ready to run (other faults that stop system from operation are not active).
To troubleshoot this fault, remove the PCM-VFD harness from the PCM while leaving the other end connected to the VFD. Check the resistance between the pins 6 & 7 of the harness connector. The resistance should be approximately 720 ohms. If the resistance is much higher than 720 ohms, then remove the connector at the other end of the cable from the VFD. Check the resistance between pin 6 of the PCM connector and pin 5 of the VFD connector, then pin 7 of the PCM connector and pin 6 of the VFD connector. If either of these shows a resistance higher than just a few ohms, then the cable is the cause of the problem. If the cable checks OK, the problem may be with the VFD. Check the resistance between pins 5 and 6 of the VFD connector. If this resistance is significantly higher than 720 ohms, then the problem is within the VFD.
Pages de dépannage ACHPVSR454-02SM.