P1843

DTC P1843
CAN time-out monitoring.

Possible causes by suggested order of priority:
- Petrol Only - Connector(s) EAT C193,C637.
- Diesel Only - Connector(s) EAT C193,C158.
- Petrol Only - Open circuit C193/16 (W) to C637/36 (W).
- Diesel Only - Open circuit C193/16 (W) to C158/35 (W).
- Petrol Only - Open circuit C193/44 (Y) to C637/37 (Y).
- Diesel Only - Open circuit C193/44 (Y) to C158/32 (Y).
- Engine management ECM was disconnected with ignition on or reprogrammed.
- Battery discharged or alternator fault.

Petrol Only - Connector(s) EAT C193,C637.
- Check for connector not correctly latched, backed out pins, damaged pins, corroded pins

Diesel Only - Connector(s) EAT C193,C158.
- Check for connector not correctly latched, backed out pins, damaged pins, corroded pins

Petrol Only - Open circuit C193/16 (W) to C637/36 (W).
- Check resistance > 1M Ohm

Diesel Only - Open circuit C193/16 (W) to C158/35 (W).
- Check resistance > 1M Ohm

Petrol Only - Open circuit C193/44 (Y) to C637/37 (Y).
- Check resistance > 1M Ohm

Diesel Only - Open circuit C193/44 (Y) to C158/32 (Y).
- Check resistance > 1M Ohm

Engine management ECM was disconnected with ignition on or reprogrammed.
CHECK THE FOLLOWING:
- If TestBook available, run ECM diagnostic. If ECM has not logged a CAN fault then suspect ECM disconnection or reprogramming.
- Clear fault code in transmission and monitor for re-occurrence.
POSSIBLE FAULTS
- ECM disconnected with ignition switched on.
- ECM was reprogrammed (ECM CAN stops during programming).

Battery discharged or alternator fault.
CHECK THE FOLLOWING:
- Examine the battery voltage logged in the fault freeze frame.
- If the logged voltage was less than approximately 10 Volts there may be a problem with the battery or alternator.
POSSIBLE FAULTS
- Discharged battery or faulty alternator.