Paccar

PACCAR MX (2004 Emissions) Fault Code: U1013 CAN Communication – Message (A1DOC) Out of Range, DOC Intake Gas Temperature from Aftertreatment System

SET CONDITIONS:
This DTC is set when a CAN message is received correctly, but the content (signal value or status) is out of the expected range.

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. A corrupt or empty CAN message
2. A malfunction in the system from which the message originates

ADDITIONAL INFORMATION:
1. A ‘message out of range’ DTC is activated by the receiving ECU but indicates a malfunction within another system which communicates with this ECU.
2. The cause of the DTC must be sought in the system from which it originates.

Example:
1. [ECU 1] detects an incorrect or missing signal from [sensor A].
2. [ECU 1] sets [DTC 1] (In this specific case, an open circuit DTC).
3. [ECU 1] constantly informs [ECU 2] about the status of [sensor A] via CAN messages.
4. Since the data received from the sensor is not available or not plausible, an ’empty’ CAN message is sent from [ECU 1] to [ECU 2].
5. [ECU 2] interprets the empty message as being out of the expected range and sets the ‘out of range DTC’ [DTC 2].

PACCAR MX (2004 Emissions) Fault Code: U1014 CAN – Hardware or Software Malfunction on V-CAN1

SET CONDITIONS:
The PCI ECU detects a malfunction on V-CAN1.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously after the ignition is switched 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?
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. V-CAN1 wiring issue
2. V-CAN1 message overload
3. Malfunction of component connected to V-CAN1

PACCAR MX (2004 Emissions) Fault Code: U1015 CAN – Hardware or Software Malfunction on A-CAN

SET CONDITIONS:
The PCI ECU detects a malfunction on A-CAN.

DIAGNOSTIC CONDITION:
This diagnosis runs continuously 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?
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. A-CAN wiring issue
2. A-CAN message overload
3. Malfunction of component connected to A-CAN

PACCAR MX (2004 Emissions) Fault Code: U1016 CAN – Message (A1DOC) Time-Out from Aftertreatment System

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: U1048 VTG Turbocharger Actuator Position – Incorrect

SET CONDITIONS:
The VTG turbocharger actuator (L037) detects:
1. a difference between the required and actual actuator motor position of more than 8.9% for more than 35 seconds with
2. An actuator effort of more than 38% with
3. An actuator temperature of more than 5°C

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the engine is in SCR heating mode.

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. After an actuator installation: VTG turbocharger actuator initialization procedure was not executed or was executed incorrectly.
2. Particulate build-up on the turbocharger nozzle ring mechanism. This particulate can be removed when:
– the learn sweep is performed several times. Therefore, key the ignition on and off
several times, or
– when the engine is operated under high load (particulate burned off)
3. Faulty actuator or turbocharger nozzle ring mechanism
4. Faulty VTG turbocharger

ADDITIONAL INFORMATION:
1. The VTG turbocharger actuator controls the actuator motor position and therefore the turbocharger nozzle ring and the effort to move the nozzle ring.
2. After this DTC has become active, P1727 and P2563 can also become active.

PACCAR MX (2004 Emissions) Fault Code: U1049 VTG Turbocharger Actuator Position – Incorrect

SET CONDITIONS:
The VTG turbocharger actuator (L037) detects:
1. A difference between the required and actual actuator motor position of more than 8.9% for more than 35 seconds with
2. An actuator effort of more than 38% with
3. An actuator temperature of more than 5°C

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the engine is not in SCR heating mode.

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. After an actuator installation: VTG turbocharger actuator initialization procedure was not executed or was executed incorrectly.
2. Particulate build-up on the turbocharger nozzle ring mechanism. This particulate can be removed when:
– the learn sweep is performed several times. Therefore, key the ignition on and off
several times or
– when the engine is operated under high load (particulate burned off)
3. Faulty actuator or turbocharger nozzle ring mechanism
4. Faulty VTG turbocharger

ADDITIONAL INFORMATION:
1. The VTG turbocharger actuator controls the actuator motor position and therefore the turbocharger nozzle ring and the effort to move the nozzle ring.
2. After this DTC has become active, P1727 and P2563 can also become active.

PACCAR MX (2004 Emissions) Fault Code: U104C VTG Turbocharger Actuator – CAN Communication Error

SET CONDITIONS:
The VTG turbo charger actuator (L037) detects that the cyclic CAN command message transmitted by the PCI ECU (D420) is missing.

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. Communication error between actuator and PCI ECU
2. Faulty VTG turbocharger actuator

ADDITIONAL INFORMATION:
1. The VTG turbo charger actuator (L037) is controlled by a cyclic CAN command message transmitted by the PCI ECU (D420) in which the operating mode and the target position are demanded.

2. The actuator motor moves to a position of 80% and is switched off with this fault active.

PACCAR MX (2004 Emissions) Fault Code: U1069 Inlet Air Pressure Before Compressor – Data Erratic, Intermittent or Incorrect

SET CONDITIONS:
The PCI ECU (D420) receives a CAN message from the humidity sensor (F852) that contains an out-of-range value for the pressure.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is 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?
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. E-CAN communication
2. Faulty humidity sensor

ADDITIONAL INFORMATION:
The humidity sensor is a smart sensor that communicates with the PCI ECU via E-CAN. The sensor measures the following three properties of the drawn in pre-compressor (VTG turbo charger) air in the inlet air pipe:
1. Relative humidity
2. Pressure
3. Temperature

PACCAR MX (2004 Emissions) Fault Code: U1070 CAN Communication – Message (AMB) Out of Range Ambient Temperature from Vehicle Control System

SET CONDITIONS:
This DTC is set when a CAN message is received correctly, but the content (signal value or status) is out of the expected range.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is turned on or when the engine is running.

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

POSSIBLE CAUSES:
1. A corrupt or empty CAN message
2. A malfunction in the system from which the message originates

ADDITIONAL INFORMATION:
1. A ‘message out of range’ DTC is activated by the receiving ECU but indicates a malfunction within another system which communicates with this ECU.
2. The cause of the DTC must be sought in the system from which it originates.

Example:
1. [ECU 1] detects an incorrect or missing signal from [sensor A].
2. [ECU 1] sets [DTC 1] (In this specific case, an open circuit DTC).
3. [ECU 1] constantly informs [ECU 2] about the status of [sensor A] via CAN messages.
4. Since the data received from the sensor is not available or not plausible, an ’empty’ CAN message is sent from [ECU 1] to [ECU 2].
5. [ECU 2] interprets the empty message as being out of the expected range and sets the ‘out of range DTC’ [DTC 2].