MBE 4000 DDEC VI Troubleshooting – Section 33.3 SPN 168/FMI 14 (Cpu)

Section 33.3
SPN 168/FMI 14 (Cpu)

This diagnosis is typically ECU power down not completed (main battery terminal possibly floating).‪

Note: If vehicle is equipped with a battery disconnect switch, it must also be inspected for proper connections.

This fault indicates the loss of battery voltage to pin 1 of the CPC #2 connector. To restore battery voltage to pin 1 of the CPC #2 connector, refer to OEM literature for the vehicle power distribution schematics.‪