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.

This fault code is activated when the pressure or temperature input from the OEM sensor exceeds the engine protection limit defined by the OEM. An engine power derate is possible, depending on the OEM application.

Possible repairs:

1)Replace the OEM harness.
2)If necessary, recalibrate 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.
This fault is set active if the ECM does not receive the Heartbeat message from the adaptive cruise control unit on the SAE J1939 data link.

If Adaptive Cruise Recovery is enabled, the driver can toggle the cruise enable switch from the OFF position to the ON position two times to get regular cruise control to operate and Fault Code 784 will go inactive. At the next key cycle, if the Heartbeat message is still not present, Fault Code 784 will go active.

There are no repairs.

PACCAR MX (2004 Emissions) Fault Code: P0016 Camshaft Speed Signal – Not Corresponding With Engine Position

SET CONDITIONS:
The PCI ECU (D420) detects that the camshaft sensor (F558) signal does not correspond to the crankshaft sensor (F552) signal (engine position) after some engine revolutions.

DIAGNOSTIC CONDITION:
This diagnostic runs during starting.

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. Air gap too large between the crankshaft sensor (F552) and the flywheel
2. Air gap too large between the camshaft sensor (F558) and the pulse wheel
3. Faulty or soiled crankshaft sensor (F552) and/or camshaft sensor (F558)
4. Damaged flywheel and/or pulse wheel
5. Incorrect timing gear setting (applicable after a repair)

ADDITIONAL INFORMATION:
1. Crankshaft sensor is used as backup to start the engine.
2. Engine torque is reduced when this DTC is active.

PACCAR MX (2004 Emissions) Fault Code: P0017 Crankshaft Speed Signal – Not Corresponding With Engine Position

SET CONDITIONS:
The PCI ECU (D420) detects that the crankshaft sensor (F552) signal does not correspond to the camshaft sensor (F558) signal (engine position) after some engine revolutions.

DIAGNOSTIC CONDITION:
This diagnostic runs during starting.

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC changes to inactive when the fault is no longer detected. To validate the repair, key the ignition off for at least 15 seconds, key on again. Then start the engine and let it idle for 1 minute.

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. Air gap too large between the camshaft sensor (F558) and the pulse wheel
2. Air gap too large between the crankshaft sensor (F552) and the flywheel
3. Faulty or soiled camshaft sensor (F558) and/or crankshaft sensor (F552)
4. Damaged flywheel and/or pulse wheel
5. Incorrect timing gear setting (applicable after a repair)

ADDITIONAL INFORMATION:
1. Camshaft sensor is used as backup to start the engine.
2. Engine torque is reduced.

PACCAR MX (2004 Emissions) Fault Code: P0045 VTG Turbocharger Actuator – Position Error or Internal Error

SET CONDITIONS:
The VTG turbocharger actuator (L037) detects that:
1. The end stops are out of range or
2. The calibration procedure with the diagnostic service tool cannot be completed correctly or
3. An internal actuator failure is active

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

RESET CONDITION:
This DTC will change to inactive after the ignition is keyed off and on again and the diagnostic runs and passes.

POSSIBLE CAUSES:
1. Temporarily frozen actuator/nozzle ring assembly
2. Soot buildup on the turbocharger nozzle ring mechanism
3. After installation of the actuator: no or incorrect initialization procedure run through
4. Faulty actuator or turbocharger nozzle ring mechanism
5. Faulty VTG turbo charger

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

2. The position of the actuator is monitored with an internal sensor and a reference magnet (reference point).

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

4. The actuator motor is switched off with this fault active.

PACCAR MX (2004 Emissions) Fault Code: P0046 VGT Turbocharger Actuator – Position Error or Internal Error

SET CONDITIONS:
The VTG turbocharger actuator (L037) detects that:
1. The actuator reference point is not detected or
2. The end stops are out of range or
3. An internal actuator failure is present.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is 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:
Actuator failures:
1. Actuator incorrectly calibrated (not calibrated) after installing actuator on turbocharger
2. Internal actuator defects

Temporary blockage of the VTG turbocharger mechanism:
1. Frozen actuator / nozzle ring assembly
2. Soot build-up on the turbocharger nozzle ring mechanism

Permanent blockage of the VTG turbocharger mechanism:
1. Damaged VTG turbocharger nozzle ring
2. Damaged VTG turbocharger sector gear

ADDITIONAL INFORMATION:
1. The position of the VTG turbocharger nozzle ring is monitored by the actuator.

2. The position of the actuator is monitored with an internal sensor and a reference magnet (reference point).

3. 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.

4. The actuator motor is switched off when this fault is active.

PACCAR MX (2004 Emissions) Fault Code: P0049 Turbo Speed – Higher Than Overspeed Limit

SET CONDITIONS:
The PCI ECU (D420) detects that the turbo speed is above 115,000 rpm for more than 3 seconds.

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.

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:
IMPORTANT: Do not troubleshoot this DTC when other VTG position-related DTCs are present. In that case, troubleshoot the VTG position-related DTCs first.