Paccar

PACCAR MX (2004 Emissions) Fault Code: P102F BPV Actuator Temperature – Data Erratic, Intermittent or Incorrect, at Ignition On

SET CONDITIONS:
The PCI ECU (D420) detects that the actuator temperature from the BPV valve actuator differs by greater than 3°C [5.4°F] from the average of other temperature sensors on the engine for more than 5 seconds (after the ignition has been keyed off for at least 8 hours).

DIAGNOSTIC CONDITION:
This diagnostic runs:
1. When the ignition is switched on (NO engine start) and
2. The difference between the coolant temperature and ambient temperature is less than 15°C [59°F] and
3. Ambient temperature is more than -20°C [-4°F]

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
The 8-hour ignition off diagnostic consists of three separate steps:
1. The vehicle ignition may NOT be keyed on or engine started for 8 to 10 consecutive hours (ideal situation would be overnight).
2. After the 8-10 consecutive hours, key on the ignition (NO engine start) and wait for 10 seconds to allow the system to power-up and the diagnostics to run.
3. Start the engine and let it idle for 2 minutes. 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:
Faulty BPV valve

ADDITIONAL INFORMATION:
1. The actuator of the BPV valve (L096) is a smart actuator that communicates with the PCI ECU via E-CAN. The actuator ECU is controlled by the PCI ECU but has its own diagnostics.

2. The temperature is measured on the (printed circuit board) of the actuator.

3. For this diagnostic, the actuator temperature received from the BPV valve actuator is compared with an average of other temperature sensors on the engine after the ignition has been keyed off for at least eight hours.

PACCAR MX (2004 Emissions) Fault Code: P1030 EGR Temperature – Data Erratic, Intermittent or Incorrect, at Ignition On

SET CONDITIONS:
The PCI ECU (D420) detects that the measured EGR temperature sensor differs more than 3?C [5.4?F] from the average of other temperature sensor readings on the engine for more than 5 seconds (after the ignition has been keyed off for at least 8 hours).

DIAGNOSTIC CONDITION:
This diagnostic runs:
1. When the ignition has been keyed off continuously for at least 8 hours
2. Difference between the coolant temperature and ambient temperature is less than 15?C [59?F]
3. Ambient temperature is more than -20?C [-4?F]

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
The 8-hour ignition off diagnostic consists of three separate steps:
1. The vehicle ignition may NOT be keyed on or the engine started for 8-10 consecutive hours (ideal situation would be overnight).
2. After the 8-10 consecutive hours, key on the ignition (NO engine start) and wait for 10 seconds to allow the system to power-up and the diagnostics to run.
3. Start the engine and let it idle for 2 minutes. 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:
EGR temperature sensor deviation

ADDITIONAL INFORMATION:
For this diagnostic, the EGR temperature sensor (F749) reading is compared with an average of other temperature sensors on the engine after the ignition has been keyed off for at least 8 hours.

PACCAR MX (2004 Emissions) Fault Code: P1032 Vehicle Speed Sensor – Data Erratic, Intermittent or Incorrect, at Ignition On

SET CONDITIONS:
The PCI ECU (D420) detects that the measured vehicle speed is more than 3 km/h (1.86 mph) after the ignition is keyed on.

DTC P1032 becomes active after five key cycles with an incorrect measured vehicle speed.

DIAGNOSTIC CONDITION:
This diagnostic runs once each key cycle. The vehicle speed is checked 2 seconds after the ignition is keyed on.

RESET CONDITION:
This DTC changes to inactive when the fault is no longer detected.

POSSIBLE CAUSES:
1. Faulty vehicle speed signal
2. Vehicle not at a standstill when keying the ignition on
3. CAN communication errors

PACCAR MX (2004 Emissions) Fault Code: P1039 Exhaust Gas Pressure After BPV – Data Valid but Too High

SET CONDITIONS:
The DTC is set if the pressure after BPV corrected for the ambient pressure is higher than the threshold which is based on the exhaust gas mass flow.

DIAGNOSTIC CONDITION:
1. The diagnostic runs if all the conditions mentioned in this chapter are met.
2. The air pressure sensor after BPV is fitted.
3. EGR and BPV are controlled normally.
4. No faults present on the pressure sensor after BPV, ambient pressure sensor, pressure sensor before turbine.
5. Exhaust gas flow rate > 250 g/s
6. Time since engine start > 60 seconds

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

ADDITIONAL INFORMATION:
Part of the component check for OBD functionality

PACCAR MX (2004 Emissions) Fault Code: P103C EGR Control – Unable to Reach Target

SET CONDITIONS:
The PCI ECU (D420) detects that the demanded NOx conversion is limited by the EGR system limits for more than 300 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs:
1. When the engine is running at a steady load and
2. Coolant temperature is above 50°C [122°F]

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. Leaking EGR system
2. Clogged EGR system
3. Clogged EGR pressure difference sensor venturi
4. NOx before catalyst sensor deviation

ADDITIONAL INFORMATION:
One way in which the engine NOx emission is controlled is by varying the EGR flow toward the inlet manifold of the engine.

PACCAR MX (2004 Emissions) Fault Code: P1040 Exhaust Gas Pressure after BPV – Data Valid but Too Low

SET CONDITIONS:
The DTC is set if the pressure after BPV corrected for the ambient pressure is lower than the threshold which is based on the exhaust gas mass flow.

DIAGNOSTIC CONDITION:
1. The diagnostic runs if all the conditions mentioned in this chapter are met.
2. The air pressure sensor after BPV is fitted.
3. EGR and BPV are controlled normally.
4. No faults present on the pressure sensor after BPV, ambient pressure sensor, pressure sensor before turbine
5. Exhaust gas flow rate > 250 g/s
6. Time since engine start > 60 seconds

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

ADDITIONAL INFORMATION:
Part of the component check for OBD functionality

PACCAR MX (2004 Emissions) Fault Code: P1042 VTG Turbocharger Control – Incorrect

SET CONDITIONS:
The PCI ECU (D420) detects that the VTG turbocharger control is limited by the exhaust gas pressure before turbine for more than 300 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs:
1. Engine speed is between 1050 and 1850 rpm and
2. The engine mode is SCR high efficiency or standard

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. Leaking exhaust system
2. Leaking pressure sensor before turbine tube
3. Pressure sensor before turbine deviation

ADDITIONAL INFORMATION:
1. The VTG turbocharger control depends, among other factors, on the exhaust gas pressure before turbine.
2. The VTG turbocharger is controlled by the VTG turbocharger actuator (L037).
3. The exhaust gas pressure before turbine is measured by the pressure sensor before turbine (F826).

PACCAR MX (2004 Emissions) Fault Code: P1048 Air Mass Flow – Data Valid but Too High, During Overrun

SET CONDITIONS:
The VTG turbocharger actuator (L037) detects:
1. A difference between the required and actual actuator motor position of more than 8.9% for more than 35 seconds with
2. An actuator effort of more than 38% with
3. An actuator temperature of more than 5?C

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the engine is in SCR heating mode.

RESET CONDITION:
This DTC will change to inactive immediately after the diagnostic runs and passes.

POSSIBLE CAUSES:
1. After an actuator installation: VTG turbocharger actuator initialization procedure was not executed or was executed incorrectly.
2. Soot build-up on the turbocharger nozzle ring mechanism

This soot can be removed when:
– the learn sweep is performed several times. Therefore, key the ignition on and off
several times or
– when the engine is operated under high load (soot burned off)

3. Faulty actuator or turbocharger nozzle ring mechanism
4. Faulty VTG turbocharger

ADDITIONAL INFORMATION:
1. The VTG turbocharger actuator controls the actuator motor position, and therefore, the turbocharger nozzle ring and the effort to move the nozzle ring.
2. After this DTC has become active, P1727 and P2563 can also become active.

PACCAR MX (2004 Emissions) Fault Code: P1049 Air Mass Flow – Data Valid but Too Low During Overrun

SET CONDITIONS:
The VTG turbocharger actuator (L037) detects:
1. A difference between the required and actual actuator motor position of more than 8.9% for more than 35 seconds with
2. An actuator effort of more than 38% with
3. An actuator temperature of more than 5?C

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the engine is not in SCR heating mode.

RESET CONDITION:
This DTC will change to inactive immediately after the diagnostic runs and passes.

POSSIBLE CAUSES:
1. After an actuator installation: VTG turbocharger actuator initialization procedure was not executed or was executed incorrectly.
2. Soot build-up on the turbocharger nozzle ring mechanism

This soot can be removed when:
– The learn sweep is performed several times. Therefore, key the ignition on and off
several times or
– When the engine is operated under high load (soot burned off)

3. Faulty actuator or turbocharger nozzle ring mechanism
4. Faulty VTG turbocharger

ADDITIONAL INFORMATION:
1. The VTG turbocharger actuator controls the actuator motor position, and therefore the turbocharger nozzle ring and the effort to move the nozzle ring.
2. After this DTC has become active, P1727 and P2563 can also become active.