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.
CONNECTOR
^ Check for connector not correctly latched, backed out pins, damaged pins, corroded pins.

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

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

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

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

Diesel Only - Open circuit C193/44 (Y) to C158/32 (Y).
OPEN_CIRCUIT
^ 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.