Paccar

PACCAR MX (2004 Emissions) Fault Code: P1341 Camshaft Speed Signal – Out of Range During Engine Start

SET CONDITIONS:
The PCI ECU (D420) detects that the camshaft sensor signal is disturbed or intermittent.

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

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 camshaft sensor signal
2. Faulty camshaft sensor

ADDITIONAL INFORMATION:
1. Camshaft sensor (F558) is used to determine the position of the engine (cylinder detection).
2. Engine torque is reduced.

PACCAR MX (2004 Emissions) Fault Code: P1350 VTG Turbocharger Actuator Power Supply – Internal Error

SET CONDITIONS:
The VTG turbocharger actuator (L037) detects an internal error.

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. VTG turbocharger actuator power supply
2. Faulty VTG turbocharger actuator

ADDITIONAL INFORMATION:
1. The VTG turbocharger is controlled by the VTG turbocharger actuator, a smart actuator that communicates with the PCI ECU via E-CAN.
2. The actuator ECU is controlled by the PCI ECU but has its own diagnostics.

PACCAR MX (2004 Emissions) Fault Code: P1351 VTG Turbocharger Actuator – Internal Error

SET CONDITIONS:
The VTG turbocharger actuator (L037) detects an internal error.

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. VTG turbocharger actuator power supply, check:
2. Faulty VTG turbo charger actuator if the DTC remains active after the above is performed/checked.

ADDITIONAL INFORMATION:
1. The VTG turbocharger is controlled by the VTG turbocharger actuator, a smart actuator that communicates with the PCI ECU via E-CAN.
2. The actuator ECU is controlled by the PCI ECU but has its own diagnostics.

PACCAR MX (2004 Emissions) Fault Code: P1352 VTG Turbocharger Actuator Learning – Malfunction Detected

CAUTION: This DTC is activated when a position deviation of the VTG turbocharger mechanism is detected.

DO NOT re-calibrate the turbocharger actuator with the diagnostic service tool before the cause of this DTC is identified and solved.

Re-calibration may lead to incorrect calibration of the turbocharger actuator end-positions, which will result in a decrease of engine performance and engine brake performance.

SET CONDITIONS:
The VTG turbo charger actuator (L037) cannot reach the end-stops during the learn sweep after the ignition is keyed on.

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

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC will change to inactive after the ignition is keyed off and on again and 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. Frozen turbocharger. Due to the presence of moisture and cold ambient conditions the turbocharger nozzle ring mechanism may have been frozen temporarily.
2. Soot build-up on the turbocharger nozzle ring mechanism
3. After an actuator installation: VTG turbocharger actuator initialization procedure was not executed or was executed incorrectly.
4. Sticking turbocharger nozzle ring (bend vanes), faulty nozzle ring mechanism or actuator

ADDITIONAL INFORMATION:
1. The position and effort to move the VTG turbocharger nozzle ring are monitored by the actuator.

2. After the ignition is keyed on, a learn sweep is performed by the actuator. During this sweep the VTG turbocharger nozzle ring is fully opened and fully closed to check the end positions.

3. The actuator can only control the nozzle ring in a limited span with this fault active.

PACCAR MX (2004 Emissions) Fault Code: P1354 VTG Turbocharger Actuator Power Supply – Data Valid but Too Low, Least Severe

SET CONDITIONS:
The VTG turbocharger actuator (L037) detects that the actuator power supply is less than 10 volts for more than 4 minutes.

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. VTG turbocharger actuator power supply
2. Faulty VTG turbocharger actuator

ADDITIONAL INFORMATION:
The power supply of the actuator is continuously monitored.

PACCAR MX (2004 Emissions) Fault Code: P1356 VGT Turbocharger Actuator Temperature – Data Valid but Too High

SET CONDITIONS:
The VTG turbo charger actuator (L037) detects that the temperature of the actuator is above 125?C [257?F] for more than five minutes.

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. The ignition is keyed on shortly after a hot engine shutdown.
2. Malfunctioning cooling system
3. Faulty VTG turbocharger actuator

ADDITIONAL INFORMATION:
The temperature is measured on the printed circuit board of the actuator.

PACCAR MX (2004 Emissions) Fault Code: P1400 EGR Mass Flow – Estimated EGR Rate Too High

SET CONDITIONS:
The PCI ECU (D420) detects that the calculated EGR gas mass flow is too high.

DIAGNOSTIC CONDITION:
This diagnostic runs when the engine speed is above 1100 rpm.

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

POSSIBLE CAUSES:
1. Contaminated EGR pressure difference sensor venturi
2. EGR pressure difference sensor deviation
3. EGR temperature sensor deviation

ADDITIONAL INFORMATION:
1. The engine NOx emission is, among others, controlled by varying the EGR gas mass flow toward the inlet manifold of the engine.
2. The EGR gas mass flow is calculated using the EGR pressure difference sensor (F751), EGR temperature sensor (F749) and boost temperature sensor (F804).
3. EGR gas mass flow toward the inlet manifold of the engine is controlled by the EGR valve module (L095).

IMPORTANT: The EGR valve position does not just indicate the amount of EGR flow to the inlet manifold. The amount of EGR gas fed back mainly depends on the pressure difference between the pressure before turbine and the boost pressure, in combination with the EGR valve position.SET CONDITIONS:
The PCI ECU (D420) detects that the calculated EGR gas mass flow is too high.

DIAGNOSTIC CONDITION:
This diagnostic runs when the engine speed is above 1100 rpm.

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

POSSIBLE CAUSES:
1. Contaminated EGR pressure difference sensor venturi
2. EGR pressure difference sensor deviation
3. EGR temperature sensor deviation

ADDITIONAL INFORMATION:
1. The engine NOx emission is, among others, controlled by varying the EGR gas mass flow toward the inlet manifold of the engine.
2. The EGR gas mass flow is calculated using the EGR pressure difference sensor (F751), EGR temperature sensor (F749) and boost temperature sensor (F804).
3. EGR gas mass flow toward the inlet manifold of the engine is controlled by the EGR valve module (L095).

IMPORTANT: The EGR valve position does not just indicate the amount of EGR flow to the inlet manifold. The amount of EGR gas fed back mainly depends on the pressure difference between the pressure before turbine and the boost pressure, in combination with the EGR valve position.

PACCAR MX (2004 Emissions) Fault Code: P1401 Crankcase Air Pressure – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (C5)

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

PACCAR MX (2004 Emissions) Fault Code: P1402 Crankcase Air Pressure – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (C5)

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