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PACCAR MX (2004 Emissions) Fault Code: U1848 EAS-3 ECU Software Verification – Incorrect

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PACCAR MX (2004 Emissions) Fault Code: U1849 NOx Sensor Before Catalyst Software Verification – Incorrect

PACCAR MX (2004 Emissions) Fault Code: U1849 NOx Sensor Before Catalyst Software Verification – Incorrect

SET CONDITIONS:
The PCI ECU detects that no or an incorrect calibration verification number (CVN) is received from the NOx sensor before catalyst.

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

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC changes to inactive next time the ignition is keyed on and 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:
1. No or intermittent CAN communication with the NOx sensor before catalyst
2. Incorrect type of NOx sensor before catalyst installed
3. Faulty NOx sensor before catalyst

ADDITIONAL INFORMATION:
When the ignition is keyed on, the PCI ECU (D420) queries the NOx sensor before catalyst (F844) for a calibration verification number (CVN).

CVN is the calibration verification number and is the result of a check performed on the software values stored in emission-related ECUs (OBD legislation).

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PACCAR MX (2004 Emissions) Fault Code: U184B CAN – Message (TESTINHB_INF) Time-Out from Aftertreatment System

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PACCAR MX (2004 Emissions) Fault Code: U184D CAN Communication – PCI ECU Cannot Start up Communication

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PACCAR MX (2004 Emissions) Fault Code: U184E CAN Communication – Message (PROPB_SW) Not Available, Speed Functions Off Switch from Steering Wheel Switches

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PACCAR MX (2004 Emissions) Fault Code: U1850 NOx Sensor after Catalyst Software Verification – Incorrect

PACCAR MX (2004 Emissions) Fault Code: U1850 NOx Sensor after Catalyst Software Verification – Incorrect

SET CONDITIONS:
The PCI ECU detects that no or an incorrect calibration verification number (CVN) is received from the NOx sensor after catalyst.

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

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC changes to inactive next time the ignition is keyed on and 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:
1. No or intermittent CAN communication with the NOx sensor after catalyst
2. Incorrect type of NOx sensor after catalyst installed
3. Faulty NOx sensor after catalyst

ADDITIONAL INFORMATION:
When the ignition is keyed on, the PCI ECU (D420) queries the NOx sensor after catalyst (F843) for a calibration verification number (CVN).

CVN is the calibration verification number and is the result of a check performed on the software values stored in emission-related ECUs (OBD legislation).

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PACCAR MX (2004 Emissions) Fault Code: U1851 NH3 Sensor Software Verification – Incorrect

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PACCAR MX (2004 Emissions) Fault Code: U1852 VTG Turbocharger Actuator Software Verification – Incorrect

PACCAR MX (2004 Emissions) Fault Code: U1852 VTG Turbocharger Actuator Software Verification – Incorrect

SET CONDITIONS:
The PCI ECU detects that no or an incorrect calibration verification number (CVN) is received from the VTG turbocharger actuator.

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

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC changes to inactive after the ignition is keyed off for at least 15 seconds and keyed on again, and 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:
1. No or intermittent power supply to the VTG turbocharger actuator
2. No or intermittent CAN communication with the VTG turbocharger actuator
3. Incorrect type of VTG turbocharger or actuator installed, only if DTC is active after a VTG turbocharger or actuator replacement
4. Faulty VTG turbocharger actuator

ADDITIONAL INFORMATION:
When the ignition is keyed on, the PCI ECU (D420) queries the VTG turbocharger actuator for a calibration verification number (CVN).

CVN is the calibration verification
number and is the result of a check performed on the software values stored in emission-related ECUs (OBD legislation).

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PACCAR MX (2004 Emissions) Fault Code: U1853 EGR Valve Module Software Verification – Incorrect

PACCAR MX (2004 Emissions) Fault Code: U1853 EGR Valve Module Software Verification – Incorrect

SET CONDITIONS:
The PCI ECU detects that no or an incorrect calibration verification number (CVN) is received from the EGR valve module.

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

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC changes to inactive after the ignition is keyed off for at least 15 seconds and keyed on again, and 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:
1. No or intermittent CAN communication with the EGR valve module. Check:
– EGR valve module power supply
– E-CAN communication
2. Incorrect type of EGR valve module installed
3. Faulty EGR valve module

ADDITIONAL INFORMATION:
When the ignition is keyed on, the PCI ECU (D420) queries the EGR valve module (L095) for a calibration verification number (CVN).

CVN is the calibration verification number and is the result of a check performed on the software values stored in emission-related ECUs (OBD legislation).

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