Paccar

PACCAR MX (2004 Emissions) Fault Code: P1020 BPV Actuator – Internal Error

SET CONDITIONS:
The BPV valve (L096) 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 error 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. E-CAN network communication issue.
2. Faulty BPV valve actuator

ADDITIONAL INFORMATION:
1. The actuator motor is switched off when this DTC is active.
2. Engine torque is reduced when this DTC is active.

PACCAR MX (2004 Emissions) Fault Code: P1021 BPV Actuator – CAN Communication Error

SET CONDITIONS:
The BPV valve (L096) detects that the cyclic CAN command message transmitted by the PCI ECU (D420) is missing for more than 7.5 seconds.

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

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC changes to inactive as soon as 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:
CAN wiring

ADDITIONAL INFORMATION:
1. The BPV valve (L096) is controlled by a cyclic CAN command message transmitted by the PCI ECU (D420) in which the operating mode and the target position are requested.
2. There is still CAN communication between the BPV actuator and PCI ECU with this fault active.
3. The actuator motor is switched off and the BPV valve is fully opened (100% position) with this fault active.
4. Engine torque is reduced after 10 hours of engine operation.

PACCAR MX (2004 Emissions) Fault Code: P1022 BPV Actuator – Internal Error

SET CONDITIONS:
The BPV valve (L096) detects that the internal actuator current is too high.

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

CORRESPONDING OBD READINESS MONITOR:
None

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

REPAIR VERIFICATION:
1. Clear all DTCs.
2. Test drive or operate the vehicle to meet the and diagnostic conditions and set conditions.
3. Did the DTC come back?
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. High friction or sticking of BPV valve bearings or mechanism
2. Blocked BPV valve

ADDITIONAL INFORMATION:
1. The actuator current is monitored.
2. The actuator motor is switched off and the BPV valve is fully opened (100% position) with this fault active.
3. Engine torque is reduced after 10 hours of engine operation.

PACCAR MX (2004 Emissions) Fault Code: P1023 BPV Actuator Temperature – Data Valid but Too High

SET CONDITIONS:
The BPV valve (L096) detects that the temperature of the actuator is higher than 142?C for more than 30 seconds.

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. The ignition is keyed on shortly after a hot engine shutdown.
2. Malfunctioning cooling system. Check the engine cooling system for:
– Low coolant level
– Air in cooling system
– Blocked cooling pipes to the actuator

ADDITIONAL INFORMATION:
1. The temperature is measured on the (printed circuit board of the) actuator.
2. The actuator motor is switched off and the BPV valve is fully opened (100% position) with this fault active.
3. Engine torque is reduced after 10 hours of engine operation.

PACCAR MX (2004 Emissions) Fault Code: P1024 BPV Actuator Power Supply – Incorrect

SET CONDITIONS:
The BPV valve (L096) detects that the actuator power supply is less than 7.5 V or greater than 35 V.

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

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC changes to inactive:
1. After the ignition is keyed off for at least 15 seconds and keyed on again and
2. When the actuator power supply is between 8.5 V and 34 V

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. Incorrect actuator power supply wiring
2. Malfunction in vehicle power supply system (battery or alternator or wiring)

ADDITIONAL INFORMATION:
1. The actuator power supply is continuously monitored.
2. The actuator motor is switched off and the BPV valve is fully open (100% position) with this DTC active.
3. Engine torque is reduced after 10 hours of engine operation.

PACCAR MX (2004 Emissions) Fault Code: P1025 BPV Actuator Position – Malfunction on Sensor

SET CONDITIONS:
The BPV valve (L096) detects a failure or deviation on the internal position sensor.

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 error 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. Bent actuator lever and/or link rod
2. Incorrectly installed link rod

ADDITIONAL INFORMATION:
1. The position of the BPV valve is monitored by a shaft position sensor in the actuator.
2. The actuator motor is switched off, and the BPV valve is fully opened (100% position) with this DTC active.
3. Engine torque is reduced after 10 hours of engine operation.

PACCAR MX (2004 Emissions) Fault Code: P1026 BPV Actuator – Out of Calibration

SET CONDITIONS:
The BPV valve (L096) detects that the open (100%) position is out of range.

DIAGNOSTIC CONDITION:
This diagnosis runs after the ignition is keyed 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 error 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. Incorrectly installed link rod
2. Bent actuator lever and/or link rod
3. Broken return-spring of the valve mechanism
4. Incorrect actuator power-supply wiring
5. High friction or sticking BPV valve bearings or mechanism
6. Blocked BPV valve

ADDITIONAL INFORMATION:
IMPORTANT: When this DTC is present, traces of lubrication oil may be visible at the compressor side of the VTG turbocharger. This does not necessarily indicate a failing turbocharger.

1. The open (100%) position of the BPV valve is checked by the actuator and compared with an ex-factory stored value.
2. The actuator motor is switched OFF and the BPV valve is fully opened (100% position) with this DTC ACTIVE.
3. Engine torque is reduced after 10 hours of engine operation.

PACCAR MX (2004 Emissions) Fault Code: P102A Exhaust Gas Temperature After BPV – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (C11)

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: P102B Exhaust Gas Temperature After BPV – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (C11)

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.