Paccar

PACCAR MX (2004 Emissions) Fault Code: P1517 Aftertreatment System – DEF Quality Malfunction Detected

SET CONDITIONS:
This DTC becomes active if the DTC from which it originates has been active for a certain time.

RESET CONDITION:
This DTC becomes inactive as soon as the DTC from which it originates has become inactive.

ADDITIONAL INFORMATION:
IMPORTANT: Do not troubleshoot this DTC since it originates from another active DTC.

1. This DTC only activates a warning for the driver.
2. This DTC becomes active together with an active DEF quality monitoring-related DTC.

PACCAR MX (2004 Emissions) Fault Code: P1518 Aftertreatment System – Engine Torque Derate Active

SET CONDITIONS:
This DTC becomes active if the DTC from which it originates activates an engine torque derate.

RESET CONDITION:
This DTC becomes inactive as soon as the DTC from which it originates has become inactive.

ADDITIONAL INFORMATION:
IMPORTANT: Do not troubleshoot this DTC since it originates from another active DTC.

This DTC only indicates that an engine torque derate is active.

PACCAR MX (2004 Emissions) Fault Code: P1519 Aftertreatment System – DEF Level Low

SET CONDITIONS:
The DEF level is less than 25% of the DEF tank volume.

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

RESET CONDITION:
This DTC becomes inactive after the ignition is keyed on and the volume in the DEF tank is above the set condition value.

POSSIBLE CAUSES:
Empty DEF tank

ADDITIONAL INFORMATION:
The driver has been informed by a warning.

PACCAR MX (2004 Emissions) Fault Code: P151A Aftertreatment System – Vehicle Speed Limitation Active

SET CONDITIONS:
This DTC becomes active if the DTC from which it originates activates a vehicle speed limitation.

RESET CONDITION:
This DTC becomes inactive as soon as the DTC from which it originates has become inactive.

ADDITIONAL INFORMATION:
IMPORTANT: Do not troubleshoot this DTC since it originates from another active DTC.

This DTC only indicates that a vehicle speed limitation is active.

PACCAR MX (2004 Emissions) Fault Code: P151B Aftertreatment System – Upcoming Vehicle Speed Limitation Warning

SET CONDITIONS:
This DTC becomes active if the DTC from which it originates activates a vehicle speed limitation as soon as the relevant conditions are met.

RESET CONDITION:
This DTC becomes inactive as soon as the DTC from which it originates has become inactive.

ADDITIONAL INFORMATION:
IMPORTANT: Do not troubleshoot this DTC since it originates from another active DTC.

This DTC activates an upcoming vehicle speed limitation warning for the driver.

PACCAR MX (2004 Emissions) Fault Code: P151C Aftertreatment System – DEF Level Too Low

SET CONDITIONS:
The DEF level is less than 20% of the DEF tank volume.

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

RESET CONDITION:
This DTC becomes inactive after the ignition is keyed on and the volume in the DEF tank is above the set condition value.

POSSIBLE CAUSES:
Empty DEF tank

ADDITIONAL INFORMATION:
The driver has been informed by a flashing warning.

PACCAR MX (2004 Emissions) Fault Code: P151D Aftertreatment System – DEF Level Very Low

SET CONDITIONS:
The DEF level is less than 15% of the DEF tank volume.

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

RESET CONDITION:
This DTC becomes inactive after the ignition is keyed on and the volume in the DEF tank is above the set condition value.

POSSIBLE CAUSES:
Empty DEF tank

ADDITIONAL INFORMATION:
This DTC activates an engine torque derate of 25% and P1518 becomes active.

PACCAR MX (2004 Emissions) Fault Code: P151E Aftertreatment System – DEF Tank Empty

SET CONDITIONS:
The DEF level is less than 11% of the DEF tank volume.

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

RESET CONDITION:
This DTC becomes inactive after the ignition is keyed on and the volume in the DEF tank is above the set condition value.

POSSIBLE CAUSES:
Empty DEF tank

ADDITIONAL INFORMATION:
1. This DTC activates an engine torque derate of 40% and P151B becomes active.

2. This DTC activates a 5 MPH vehicle speed limit and P151A becomes active, after:
– A key cycle or
– Vehicle refuel (fuel tank volume increase > 16%) or
– Vehicle has been stationary for 1 hour

PACCAR MX (2004 Emissions) Fault Code: P1524 Engine Oil Pressure – Data Valid but Too Low, Moderately Severe

SET CONDITIONS:
The PCI ECU (D420) detects that the oil pressure is too low.

DIAGNOSTIC CONDITION:
This diagnostic runs when the engine has been running for more than eight seconds.

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. Oil level too low
2. Very high oil temperature. Check for the presence of relevant DTCs.
3. Faulty oil pressure sensor
4. Faulty oil pump

ADDITIONAL INFORMATION:
1. The oil pressure is measured by the oil pressure sensor (F810).
2. The driver is informed by a yellow warning on DIP.