Paccar

PACCAR MX (2004 Emissions) Fault Code: P0219 Engine Speed – Data Valid but Too High

SET CONDITIONS:
The PCI ECU (D420) detects that the engine speed is above 2300 rpm.

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

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
1. This DTC changes to inactive when the fault is no longer detected.
2. This fault cannot be cleared from the ECU memory.

REPAIR VERIFICATION:
1. Contact your engine field service representative for authorization to clear the warranty DTC.
2. Clear all DTCs.
3. Test drive or operate the vehicle to meet the diagnostic conditions and set conditions.
4. Did the DTC come back? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. Driver operating fault.
2. External combustible drawn into the inlet path.

ADDITIONAL INFORMATION:
1. The engine speed is determined by the crankshaft sensor (F552) signal and as backup by the camshaft sensor (F558) signal.
2. Engine overspeed is detected.
3. The driver was informed by a warning.
4. This fault cannot be cleared from the ECU memory.

PACCAR MX (2004 Emissions) Fault Code: P0221 CAN Communication – Message (EEC2) Out of Range, Remote Accelerator Pedal Position

SET CONDITIONS:
This DTC is set when the 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 a system connected to the ECU that sets the DTC.

ADDITIONAL INFORMATION:
1. A ‘CAN message out of range’ DTC is set by the receiving ECU but indicates a malfunction within another system that is connected to this ECU.
2. The cause of the DTC must to 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] continuously 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: P0261 Common Rail Pump Unit 1 – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (A25)

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

PACCAR MX (2004 Emissions) Fault Code: P0262 Common Rail Pump Unit 1 – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (A25)

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.

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 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 maximum rail pressure is limited to 1300 bar.

PACCAR MX (2004 Emissions) Fault Code: P0263 Cylinder 1 – Torque Contribution Too Low

SET CONDITIONS:
The PCI ECU (D420) detects that the combustion contribution of cylinder 1 is lower relative to the other cylinders.

DIAGNOSTIC CONDITION:
This diagnostic runs when the engine is running at a steady speed and load, and the vehicle speed is steady.

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? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. Faulty cylinder 1 injector (under-fueling)
2. Faulty MX Engine Brake cylinder 1
3. Symptom: Slightly reduced power:
– Incorrect valve clearance
– Major imbalance in the drive shaft
4. Symptom: Engine block vibration at high load, damaged flywheel
5. Mechanical defect (for example damaged cam follower or broken valve)

ADDITIONAL INFORMATION:
1. The PCI ECU can detect and identify the cylinder contribution of every cylinder based on analysis of the rotational speed of the crankshaft using a:
– Cylinder-to-cylinder engine speed comparison and
– Cylinder-to-cylinder rotational crankshaft acceleration comparison

2. This DTC can be the result of another DTC that indicates too high of a combustion contribution of another cylinder.

PACCAR MX (2004 Emissions) Fault Code: P0266 Cylinder 2 – Torque Contribution Too Low

SET CONDITIONS:
The PCI ECU (D420) detects that the combustion contribution of cylinder 2 is lower relative to the other cylinders.

DIAGNOSTIC CONDITION:
This diagnostic runs when the engine is running at a steady speed and load, and the vehicle speed is steady.

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? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. Faulty cylinder 2 injector (under-fueling)
2. Faulty MX Engine Brake cylinder 2
3. Symptom: Slightly reduced power:
– Incorrect valve clearance
– Major imbalance in the drive shaft
4. Symptom: Engine block vibration at high load, damaged flywheel
5. Mechanical defect (for example damaged cam follower or broken valve)

ADDITIONAL INFORMATION:
1. The PCI ECU can detect and identify the cylinder contribution of every cylinder based on analysis of the rotational speed of the crankshaft using a:
– Cylinder-to-cylinder engine speed comparison and
– Cylinder-to-cylinder rotational crankshaft acceleration comparison

2. This DTC can be the result of another DTC that indicates too high of a combustion contribution of another cylinder.

PACCAR MX (2004 Emissions) Fault Code: P0269 Cylinder 3 – Torque Contribution Too Low

SET CONDITIONS:
The PCI ECU (D420) detects that the combustion contribution of cylinder 3 is lower relative to the other cylinders.

DIAGNOSTIC CONDITION:
This diagnostic runs when the engine is running at a steady speed and load, and the vehicle speed is steady.

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? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. Faulty cylinder 3 injector (under-fueling)
2. Faulty MX Engine Brake cylinder 3
3. Symptom: Slightly reduced power:
– Incorrect valve clearance
– Major imbalance in the drive shaft
4. Symptom: Engine block vibration at high load, damaged flywheel
5. Mechanical defect (for example damaged cam follower or broken valve)

ADDITIONAL INFORMATION:
1. The PCI ECU can detect and identify the cylinder contribution of every cylinder based on analysis of the rotational speed of the crankshaft using a:
– Cylinder-to-cylinder engine speed comparison, and
– Cylinder-to-cylinder rotational crankshaft acceleration comparison

2. This DTC can be the result of another DTC that indicates too high of a combustion contribution of another cylinder.

PACCAR MX (2004 Emissions) Fault Code: P0272 Cylinder 4 – Torque Contribution Too Low

SET CONDITIONS:
The PCI ECU (D420) detects that the combustion contribution of cylinder 4 is lower relative to the other cylinders.

DIAGNOSTIC CONDITION:
This diagnostic runs when the engine is running at a steady speed and load, and the vehicle speed is steady.

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? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. Faulty cylinder 4 injector (under-fueling)
2. Faulty MX Engine Brake cylinder 4
3. Symptom: Slightly reduced power:
– Incorrect valve clearance
– Major imbalance in the drive shaft
4. Symptom: Engine block vibration at high load, damaged flywheel
5. Mechanical defect (for example damaged cam follower or broken valve)

ADDITIONAL INFORMATION:
1. The PCI ECU can detect and identify the cylinder contribution of every cylinder based on analysis of the rotational speed of the crankshaft using a:
– Cylinder-to-cylinder engine speed comparison and
– Cylinder-to-cylinder rotational crankshaft acceleration comparison

2. This DTC can be the result of another DTC that indicates too high of a combustion contribution of another cylinder.

PACCAR MX (2004 Emissions) Fault Code: P0273 Common Rail Pump Unit 2 – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (A28)

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