PACCAR MX (2004 Emissions) Fault Code: P1678 PCI ECU – Software Error

SET CONDITIONS:
Programmed data in the ECU not correct.

DIAGNOSTIC CONDITION:
This diagnostic runs during start-up of the PCI ECU.

RESET CONDITION:
This DTC changes to inactive when the fault is no longer detected.

POSSIBLE CAUSES:
Software fault

ADDITIONAL INFORMATION:
1. The PCI ECU does not start up.
2. Engine cannot be started.