Paccar

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

If inactive counts of Fault Code 471 are logged in the ECM, it can be possible that the engine was running or keyed on while tilted at an angle severe enough to cause this fault to be triggered.

Other causes of Fault Code 471 can include:

1)The engine was not filled to proper capacity during the most recent oil change
2)External engine oil leaks (oil leaking onto the ground)
3)Internal engine oil leaks (oil leaking into the fuel system or cooling system)
4)High engine oil consumption/power cylinder failure (check for abnormally high blowby when the engine is loaded).

Possible repairs:

1)Add engine lubricating oil to the engine.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

The intake manifold 1 temperature sensor measures the temperature of the charge-air as it passes through the intake manifold. Possible causes of this fault code include:

1)Plugged charge air cooler fins
2)Restricted airflow through the charge air cooler
3)An undersized charge air cooler
4)High turbocharger compressor outlet temperature.

Possible repairs:

1)Replace the intake manifold temperature sensor.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

Possible causes:

1)Open or short circuit internally to the oil level sensor
2)A malfunctioning oil level sensor.

Possible repairs:

1)Replace the oil level sensor.
2)The removal and installation of the connector may correct the problem.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

The switch can be monitored for proper operation with INSITE™ electronic service tool. If the switch is changing state correctly on the service tool, then the problem does not lie in the switch circuit.

The 3-position switch has three states:

1)Position 1 – open
2)Position 2 – closed
3)Position 3 – 1500 ohm resistance.

The 2-position switch has two states:

1)Position 1 – open
2)Position 2 – closed.

Possible repairs:

1)Replace the alternate torque switch.
2)Repair or replace the OEM harness.
3)The removal and reinstallation of the connector may correct the problem.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

The ECM monitors the voltage level on this circuit. When the ECM commands the OEM output signal low, it expects the voltage level to be approximately 0-VDC. If it detects a high voltage, this fault is recorded. If Fault Code 529 is still active after completing the following troubleshooting steps, refer to the OEM troubleshooting and repair manual for procedures to check the OEM output device for an open circuit or short circuit to ground.

Possible causes:

1)Open circuit in the engine harness or OEM output control solenoid
2)Short circuit to voltage source in the OEM harness
3)Malfunctioning ECM.

Possible repairs:

1)Replace the OEM output control solenoid.
2)Repair or replace the OEM harness
3)Replace the ECM.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

A fuel pump actuator with excessive leakage or a damaged inboard o-ring will result in high fuel rail pressures at idle or light load.

If the fuel pump actuator exhibits excessive leakage, it is possible that the fuel rail pressure will reach the opening pressure of the fuel rail pressure relief valve and Fault Code 1911 can possibly also become active.

The fuel rail pressure sensor should also be checked. When checking the fuel rail pressure sensor accuracy, make sure the high-pressure fuel rail is not pressurized. The fuel pump, high-pressure fuel lines, and fuel rail contain very high-pressure fuel. Do not loosen any fittings while the engine is running. Wait at least 10 minutes after shutting down the engine before loosening any fittings in the high-pressure fuel system to allow pressure to decrease to a lower level. There could be a significant amount of time waiting on the rail to depressurize to zero on some engines. In such cases, it may be necessary to manually relieve the pressure from the high-pressure fuel rail.

Possible repairs:

1)Replace the rail fuel pressure sensor.
2)Repair the source of the high fuel drain line restriction.
3)Replace the fuel pump actuator

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

A fuel pump actuator with excessive leakage or a damaged inboard o-ring will result in high fuel rail pressures at idle or light load.

If the fuel pump actuator exhibits excessive leakage, it is possible that the fuel rail pressure will reach the opening pressure of the fuel rail pressure relief valve and Fault Code 1911 can possibly also become active.

The fuel rail pressure sensor should also be checked. When checking the fuel rail pressure sensor accuracy, make sure the high-pressure fuel rail is not pressurized. The fuel pump, high-pressure fuel lines, and fuel rail contain very high-pressure fuel. Do not loosen any fittings while the engine is running. Once the engine is keyed off, there could be a significant amount of time waiting on the rail to depressurize to zero. It is necessary to manually relieve the pressure from the high-pressure fuel rail by loosening the pump to rail line at the rail.

Possible repairs:

1)Replace the rail fuel pressure sensor.
2)Repair the source of the high fuel drain line restriction.
3)lace the fuel pump actuator.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

This fault code can become active any time the engine is loaded and the electronic control module (ECM) detects the fuel pressure in the rail fuel is not changing. This fault code will become inactive whenever the ECM is powered down or if the ECM detects that the engine is loaded and the fuel pressure is changing normally. If there are many inactive counts of this fault code or if the fault is not repeatable, look for signs of tampering to the fuel pressure sensor circuit. If the fault code occurs intermittently (can not be reproduced during a road test), then inspect each of the following for poor connections or damage:

1)Intake manifold pressure sensor
2)Backup engine position sensor
3)Fuel pressure sensor.

Possible repairs:

1)Replace the rail fuel pressure sensor.
2)Replace the ECM.
3)Repair or replace the engine harness.
4)Replace the OEM Harness.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM. Use the following procedure in the corresponding Troubleshooting and Repair Manual for the engine being serviced.

Possible causes:

1)Crankcase ventilation filter needs to be replaced
2)Crankcase pressure sensor damage
3)Malfunctioning or misassembled closed crankcase ventilation valve
4)Frozen, plugged, or restricted crankcase ventilation hose
5)Plugged or restricted crankcase ventilation hose
6)Plugged or restricted crankcase ventilation oil drain tube or check valve
7)Plugged or restricted crankcase breather tube (Rear Engine Mounted Crankcase Ventilation Filter)
8)High air intake restriction.

Depending on the breather system used, the crankcase ventilation filter will be located:

•On top of the rocker lever cover, between the rocker lever cover and the crankcase ventilation filter cover.
•At the rear of the engine, encased in an external crankcase ventilation filter housing that mounts to the flywheel housing.
Both systems are closed crankcase breather systems, meaning the crankcase gases are vented into the intake system at the inlet to the turbocharger compressor.

It is important to check for plugged or restricted hoses, tubes, check valves, and filters in extreme cold ambient temperatures.

If Fault Code 555 becomes active due to a plugged filter before the maintenance interval is reached or the filter plugs frequently, see the High Blowby (Crankcase Gases (Blowby) Excessive) troubleshooting symptom tree.

Possible repairs:

1)Replace the crankcase pressure sensor.
2)Replace the crankcase ventilation filter.
3)Replace the crankcase breather element.
4)Correct or replace the crankcase ventilation valve.
5)Clean or replace the crankcase ventilation oil drain tubes, check valves, or breather tube.
6)Replace the crankcase ventilation hose.
7)Repair the air intake restriction.