PACCAR MX (2004 Emissions) Fault Code: U1843 CAN – Message (VDHR) Time-Out from Tachograph

SET CONDITIONS:
This DTC is set when the repetition rate of the received CAN message is lower than expected or when the message is not received at all.

DIAGNOSTIC CONDITION:
The diagnostic runs continuously when the ignition is keyed on or when the engine is running.

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
The DTC changes to inactive after the diagnostic runs and passes.

REPAIR VERIFICATION:
1. Clear all DTCs.
2. Test drive or operate the vehicle to meet the diagnostic conditions and set conditions.
3. Did the DTC come back?
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. Wiring issues (interruption or contact resistance)
2. Defective components
3. Incorrect software configuration

PACCAR MX (2004 Emissions) Fault Code: U1841 CAN – Message (VDC2) Time-Out from Brake System

PACCAR MX (2004 Emissions) Fault Code: U1839 CAN Communication – Message (PTO) Out of Range, Remote PTO Governor Preprogrammed Speed Control Switch #2

PACCAR MX (2004 Emissions) Fault Code: U1838 CAN Communication – Message (PTO) Out of Range, Engine PTO Governor Enable Switch

PACCAR MX (2004 Emissions) Fault Code: U1837 CAN Communication – Message (PTO) Out of Range, Engine Remote PTO Governor Preprogrammed Speed Control Switch

PACCAR MX (2004 Emissions) Fault Code: U1836 CAN Communication – Message (PTO) Out of Range, Engine Remote PTO Governor Variable Speed Control Switch

PACCAR MX (2004 Emissions) Fault Code: U1835 VTG Turbocharger Actuator – CAN, Message Time-Out

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