If Code 57 appears when exiting Diagnostic Mode, verify that the firmware chip on the Operator Display Interface Card is at version 2005 or higher. If not, replace the Operator Display Interface Card. For chip location, see Figure 7-57 on page 7-31.
This code can occur in two ways:
* Truck operates with Code 57 displayed.
* Check continuity of wiring harness from display interface to Carriage Manager JP3-JPC18.
* If continuity is OK, replace the Operator Display Interface Card. See "Operator Display Interface Card" on page 7-81.
* Truck does not operate with Code 57 displayed.
* See "Troubleshooting Communication Fault Codes (50-series)" on page 5-20.
* Check for shorts to frame.