Paccar

PACCAR MX (2004 Emissions) Fault Code: P229B Common Rail Pressure Release Valve Current – Too Low

SET CONDITIONS:
The PCI ECU (D420) detects that the measured common rail pressure release valve current is too low.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously during starting and 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. Faulty common rail pressure release valve wiring (open circuit)
2. Faulty common rail pressure release valve

ADDITIONAL INFORMATION:
1. The PCI ECU controls and checks the current of the common rail pressure release valve (L094). The current is controlled with a duty cycle.

2. When this DTC is active:
– the engine torque is reduced.
– the engine runs in protection mode.
– the rail pressure control is in the limp-home function.
– the rail pressure is limited to approximately 800 bar.

PACCAR MX (2004 Emissions) Fault Code: P229C Common Rail Pressure Release Valve Current – Data Valid but Too Low

SET CONDITIONS:
The PCI ECU (D420) detects that the common rail pressure release valve control current has been lower than expected for more than 6 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs when the rail pressure operating state is: Release valve only.

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:
Faulty common rail pump unit (too much fuel is pumped to the rail)

ADDITIONAL INFORMATION:
1. The PCI ECU controls and checks the current of the common rail pressure release valve (L094). The current is controlled with a duty cycle.

2. When this DTC is active:
– The engine torque is reduced.
– The engine runs in protection mode.
– The rail pressure control is: Pump unit only.
– The rail pressure is limited to approximately 1300 bar.

PACCAR MX (2004 Emissions) Fault Code: P229D Common Rail Pressure Release Valve Current – Data Valid but Too High

SET CONDITIONS:
The PCI ECU (D420) detects that the common rail pressure release valve control current has been higher than expected for more than six seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs when the rail pressure operating state is: Release valve only.

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. Faulty common rail pump unit (too little fuel is pumped to the rail).
2. Leaking common rail pressure release valve.

ADDITIONAL INFORMATION:
1. The PCI ECU controls and checks the current of the common rail pressure release valve (L094). The current is controlled with a duty cycle.

2. When this DTC is active:
– the engine torque is reduced.
– the engine runs in protection mode.
– the rail pressure control is: Pump unit only.
– the rail pressure is limited to approximately 1300 bar.

PACCAR MX (2004 Emissions) Fault Code: P2457 EGR Temperature – Data Valid but Too High, Most Severe

SET CONDITIONS:
The PCI ECU (D420) detects that measured EGR temperature is more than 240°C [464°F] for more than 30 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is keyed on and 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. Coolant level too low
2. Reduced coolant flow, EGR cooler
3. EGR temperature sensor deviation

ADDITIONAL INFORMATION:
The EGR gas flow temperature is monitored by the EGR temperature sensor (F749).

PACCAR MX (2004 Emissions) Fault Code: P2458 CAN Communication – Message (CM1) Out of Range, DPF Regeneration Switch 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:
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: P2459 CAN Communication – Message (CM1) Out of Range, DPF Regeneration Switch 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:
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: P2507 Engine Off Time – Data Erratic, Intermittent or Incorrect

SET CONDITIONS:
The PCI ECU detects that the power-off duration is unlikely.

DIAGNOSTIC CONDITION:
This diagnostic runs when:
1. The ignition is switched on and
2. The temperature after BPV was more than 227°C [461°F] at the previous ignition switch off event

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:
This DTC may become active once, shortly after the vehicle has left the factory.

Actions:
1. Clear the DTCs.
2. Drive the vehicle and monitor with the diagnostic service tool if the temperature after BPV passes 227°C [461°F] at least once.
3. Stop the engine, key the ignition off for more than 30 minutes.
4. Key on the ignition and read the DTCs.
5. If this DTC does not reoccur, no further investigation is necessary.

ADDITIONAL INFORMATION:
The power off duration calculation feature calculates the time since the last power down. For this diagnostics, a calibrated temperature after BPV drop over time is used to check if the power off duration of the PCI ECU is likely.

PACCAR MX (2004 Emissions) Fault Code: P2507 Engine Off Time – Data Erratic, Intermittent or Incorrect

SET CONDITIONS:
The PCI ECU detects that the power-off duration is unlikely.

DIAGNOSTIC CONDITION:
This diagnostic runs when the ignition is switched on, and the temperature after BPV was more than 227°C [461°F] at the previous ignition switch off event.

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:
This DTC may become active once, shortly after the vehicle has left the factory.

Actions:
1. Clear the DTCs.
2. Drive the vehicle and monitor with the diagnostic service tool if the temperature after BPV passes 227°C [461°F] at least once.
3. Stop the engine, key the ignition off for more than 30 minutes.
4. Key on the ignition and read the DTCs.
5. If this DTC does not reoccur, no further investigation is necessary.

ADDITIONAL INFORMATION:
The power off duration calculation feature calculates the time since the last power down. For this diagnostics, a calibrated temperature after BPV drop over time is used to check if the power-off duration of the PCI ECU is likely.

PACCAR MX (2004 Emissions) Fault Code: P250B Engine Oil Level – Data Erratic, Intermittent or Incorrect, at Ignition On

SET CONDITIONS:
The PCI ECU (D420) detects that the oil level startup is not possible.

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 diagnosis 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:
No repairs are necessary.

ADDITIONAL INFORMATION:
Do not troubleshoot this DTC.