Paccar

PACCAR MX (2004 Emissions) Fault Code: U17B4 Water in Fuel Drain Control – Short Circuit to Ground on ECU (D420) Pin (A37)

CORRESPONDING OBD READINESS MONITOR:
None

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

PACCAR MX (2004 Emissions) Fault Code: U17B5 Water in Fuel Drain Control – Current Too Low or Open Circuit on ECU (D420) Pin (A37)

SET CONDITIONS:
The PCI ECU detects an open circuit on pin A37.

DIAGNOSTIC CONDITION:
This diagnostic runs only when the engine is running.

CORRESPONDING OBD READINESS MONITOR:
None

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

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. Interruption of the wiring on PCI ECU pin A37
2. Interruption of the wiring on PCI ECU pin A40
3. Faulty water drain valve

ADDITIONAL INFORMATION:
The water drain valve is combined with the water in fuel sensor and is installed on the fuel filtration module (L097).

PACCAR MX (2004 Emissions) Fault Code: U17B6 CAN Communication – Message (TSC1_AE) Data Error from Brake System

SET CONDITIONS:
This DTC is set if a fault is detected in the Torque Speed Control message coming from the Adaptive Cruise Control.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is on.

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC will change to inactive immediately 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. External interference of the CAN communication
2. Defective component
3. Software incorrect or incompatible

PACCAR MX (2004 Emissions) Fault Code: U17B7 CAN Communication – Message (TSC1_BE) Data Error from Brake System

SET CONDITIONS:
This DTC is set if a fault is detected in the Torque Speed Control message coming from the Adaptive Cruise Control.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is on.

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC will change to inactive immediately 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. External interference of the CAN communication
2. Defective component
3. Software incorrect or incompatible

PACCAR MX (2004 Emissions) Fault Code: U17B8 CAN Communication – Message (TSC1_HCE) Data Error from Aftertreatment System

SET CONDITIONS:
This DTC is set if a fault is detected in the Torque Speed Control message coming from the Adaptive Cruise Control.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is on.

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC will change to inactive immediately 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. External interference of the CAN communication
2. Defective component
3. Software incorrect or incompatible

PACCAR MX (2004 Emissions) Fault Code: U17B9 CAN Communication – Message (TSC1_PE) Data Error

SET CONDITIONS:
This DTC is set if a fault is detected in the Torque Speed Control message coming from the Adaptive Cruise Control.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is on.

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC will change to inactive immediately 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. External interference of the CAN communication
2. Defective component
3. Software incorrect or incompatible

PACCAR MX (2004 Emissions) Fault Code: U17BA VTG Turbocharger Actuator Temperature – Data Erratic, Intermittent or Incorrect, at Ignition On

SET CONDITIONS:
The PCI ECU (D420) detects that the VTG turbo charger actuator temperature differs by more than 3°C [5.4°F] from the averages of other temperature sensor readings of the engine for more than 5 seconds (after the ignition has been keyed off for at least 8 hours).

DIAGNOSTIC CONDITION:
This diagnostic runs:
1. When the ignition has been keyed off continuously for at least 8 hours
2. Difference between the coolant temperature and ambient temperature is less than 15°C [27°F]
3. Ambient temperature is more than -20°C [-4°F]

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
The 8-hour ignition off diagnostic consists of three separate steps:
1. The vehicle ignition may NOT be keyed on or the engine started for 8-10 consecutive hours (ideal situation would be overnight).
2. After the 8-10 consecutive hours, key on the ignition (NO engine start) and wait for 10 seconds to allow the system to power-up and the diagnostics to run.
3. Start the engine and let it idle for 2 minutes. This DTC changes to inactive when the fault is no longer detected.

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? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
Faulty VTG turbocharger actuator

ADDITIONAL INFORMATION:
1. The VTG turbocharger actuator (L037) is a smart actuator that communicates with the PCI ECU via E-CAN. The actuator ECU is controlled by the PCI ECU but has its own diagnostics.

2. For this diagnostic, the VTG turbocharger actuator temperature is compared with the averages of other temperature sensor readings of the engine after the ignition has been keyed off for at least 8 hours.

PACCAR MX (2004 Emissions) Fault Code: U17C4 CAN – Message (TSC1 ACXR) Time-Out

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: U17C5 CAN – Message (TSC1_AXR) Time-Out

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