Paccar

PACCAR MX (2004 Emissions) Fault Code: P2266 Water in Fuel – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (A49)

SET CONDITIONS:
This DTC is set when the ECU detects a lower voltage than expected on the signal or control circuit of the ECU.

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

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC changes to inactive when the fault is no longer detected. To validate the repair, monitor the water in fuel sensor signal with the diagnostic service tool.

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. Open circuit or short circuit to earth in the wiring
2. Check the sensor voltage with the diagnostic service tool
3. Faulty water in fuel sensor

ADDITIONAL INFORMATION:
The water in fuel sensor is part of the fuel filtration module (L097).

PACCAR MX (2004 Emissions) Fault Code: P2275 Water in Fuel – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (A49)

SET CONDITIONS:
This DTC is set when the ECU detects a higher voltage than expected on the signal or control circuit of the ECU.

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

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC changes to inactive when the fault is no longer detected. To validate the repair, monitor the water in fuel sensor signal with the diagnostic service tool.

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. The sensor or actuator signal wiring has a short circuit to supply.
2. Faulty water in fuel sensor

ADDITIONAL INFORMATION:
1. The water in fuel sensor is part of the fuel filtration module (L097).
2. The sensor voltage can be monitored with the diagnostic service tool.

PACCAR MX (2004 Emissions) Fault Code: P228C Common Rail Fuel Pressure Control – Incorrect

SET CONDITIONS:
The PCI ECU (D420) detects that the measured rail pressure is more than 200 bar higher than the commanded rail pressure for more than 9 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs when the rail pressure operating state is: Pump unit only.

CORRESPONDING OBD READINESS MONITOR:
Fuel system monitor

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 following conditions:
– Corresponding readiness monitor displays ‘Ready’
– Diagnostic conditions are met
– Set conditions are met
3. Did the DTC come back?
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
Common rail pump unit failure

ADDITIONAL INFORMATION:
1. The rail pressure is closed-loop controlled. A comparison is made between the rail pressure commanded by the ECU and the rail pressure feedback measured by the common rail pressure sensor.

2. The rail pressure is measured in the common rail by the common rail pressure sensor (F854).

3. When this DTC is active:
– The engine torque is reduced.
– The engine runs in protection mode.
– The maximum rail pressure is limited to 1300 bar.

PACCAR MX (2004 Emissions) Fault Code: P228D Common Rail Fuel Pressure Control – Incorrect

SET CONDITIONS:
The PCI ECU (D420) detects that the actual rail pressure is more than 200 bar lower than the commanded rail pressure for more than 3 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs when the rail pressure operating state is: Pump unit only.

CORRESPONDING OBD READINESS MONITOR:
Fuel system monitor

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 following conditions:
– Corresponding readiness monitor displays ‘Ready’
– Diagnostic conditions are met
– Set conditions are met
3. Did the DTC come back?
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. Only in case this DTC is set after a fuel injection pipe has been renewed; incorrect installation of the fuel injection pipe.
2. Air present in the fuel system. If the fuel system or parts of it have been emptied during maintenance or repair, this DTC may become active temporarily after the engine is started. If the DTC stays inactive when the engine is running, no further investigation is necessary.
3. Malfunction in the low-pressure fuel system
4. An external or internal leakage on the high-pressure fuel system components
5. Common rail pump unit failure

ADDITIONAL INFORMATION:
1. The rail pressure is closed-loop controlled. A comparison is made between the rail pressure commanded by the ECU and the rail pressure feedback measured by the common rail pressure sensor.

2. The actual rail pressure is measured in the common rail by the common rail pressure sensor (F854).

3. P0094 can also be active when this DTC is active.

PACCAR MX (2004 Emissions) Fault Code: P228E Common Rail Fuel Pressure Control – Incorrect

SET CONDITIONS:
The PCI ECU (D420) detects that the measured rail pressure is more than 200 bar higher than the commanded rail pressure for more than 6 seconds.

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

CORRESPONDING OBD READINESS MONITOR:
Fuel system monitor

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 following conditions:
– Corresponding readiness monitor displays ‘Ready’
– Diagnostic conditions are met
– Set conditions are met
3. Did the DTC come back?
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
Pressure release valve

ADDITIONAL INFORMATION:
1. The rail pressure is closed-loop controlled. A comparison is made between the rail pressure commanded by the ECU and the rail pressure feedback measured by the common rail pressure sensor.

2. The rail pressure is measured in the common rail by the common rail pressure sensor (F854).

PACCAR MX (2004 Emissions) Fault Code: P228F Common Rail Fuel Pressure Control – Incorrect

SET CONDITIONS:
The PCI ECU (D420) detects that the measured rail pressure is more than 20 bar lower than the commanded rail pressure for more than 6 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs:
1. When the engine is running at a steady load and speed.
2. When the rail pressure operating state is: Pump unit only.

CORRESPONDING OBD READINESS MONITOR:
Fuel system monitor

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 following conditions:
– Corresponding readiness monitor displays ‘Ready’
– Diagnostic conditions are met
– Set conditions are met
3. Did the DTC come back?
– No, repair successful
– Yes, repair unsuccessful

ADDITIONAL INFORMATION:
1. The rail pressure is closed-loop controlled. A comparison is made between the rail pressure commanded by the ECU and the rail pressure feedback measured by the common rail pressure sensor.

2. The rail pressure is measured in the common rail by the common rail pressure sensor (F854).

PACCAR MX (2004 Emissions) Fault Code: P2294 Common Rail Pressure Release Valve – Open Circuit on ECU (D420) Pin (C4) or Pin (C26)

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

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

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

PACCAR MX (2004 Emissions) Fault Code: P2295 Common Rail Pressure Release Valve – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (C4)

SET CONDITIONS:
This DTC is set when the ECU detects a lower voltage than expected on the signal or control circuit of the ECU.

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

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. The sensor or actuator signal wiring is interrupted.
2. The sensor or actuator signal wiring has a short circuit to ground.
3. A malfunction in the power supply of the sensor or actuator
4. A malfunction of the sensor or actuator

ADDITIONAL INFORMATION:
1. 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.

2. Multiple sensor related voltage-too-low DTCs can indicate a malfunction within a 5-V sensor power supply circuit of the PCI ECU.

PACCAR MX (2004 Emissions) Fault Code: P2296 Common Rail Pressure Release Valve – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (C4)

SET CONDITIONS:
This DTC is set when the ECU detects a higher voltage than expected on the signal or control circuit of the ECU.

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

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

POSSIBLE CAUSES:
1. The sensor or actuator signal wiring has a short circuit to supply.
2. A malfunction of the sensor or actuator

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