Description: Memory check sum error (PCU) PCU memory check sum error
Causes: EEPROM trouble EEPROM is not initialized. PCU PWB EEPROM access circuit trouble Uninitialized EEPROM installed.
Remedy: Check that EEPROM is properly inserted. Save the counter/adjustment values with the DIAG simulation. Use DIAG (SIM16) to cancel U2 trouble. Replace the Controller PWB.
Code: U6-00
Description: Desk/LCC communication trouble Desk/LCC communication error Communication cable test error after turning on the power or exiting DIAG.
Causes: Improper connection or disconnection of connector and harness Desk control PWB trouble Control PWB (PCU) trouble Noise or interference
Remedy: Canceled by turning OFF/ON the power. Check connection of the harness and connector in the communication line.