Paccar

PACCAR MX (2004 Emissions) Fault Code: P2560 Coolant Level – Data Valid but Too Low, Most Severe

SET CONDITIONS:
The PCI ECU (D420) detects that the coolant level is too low.

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

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. Coolant level is too low
2. Faulty coolant surge tank float/level sensor

ADDITIONAL INFORMATION:
1. The OEM coolant level sensor is connected to the coolant level sensor connector (F772). See the OEM information for detailed information about the electrical system.
2. The red warning has been activated on the driver’s display.

PACCAR MX (2004 Emissions) Fault Code: P2563 VTG Turbocharger Actuator Position – No or Too Slow Movement

IMPORTANT: DO NOT re-calibrate the turbocharger actuator before the cause of this DTC has been identified and solved. Re-calibration could lead to engine performance and/or engine brake performance issues.

SET CONDITIONS:
The VTG turbocharger actuator (L037) detects a difference between the requested and actual actuator motor position of more than 8.9%, for more than 35 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is on, and the actuator temperature is more than 5°C.

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. Temporary blockage of the VTG turbocharger nozzle ring mechanism due to:
– Soot build-up
– Freezing
– Engine start shortly after a hot shutdown
2. Malfunction turbocharger actuator
3. Malfunction VTG turbocharger nozzle ring mechanism

ADDITIONAL INFORMATION:
1. The VTG turbocharger actuator controls the turbocharger nozzle ring.

2. After this DTC becomes active, P1727 can also become active.

3. Turbocharger actuators are occasionally re-calibrated by a technician in an attempt to solve turbocharger actuator position-related DTCs. This will lead to the turbocharger actuator being calibrated to incorrect end-positions. Incorrect calibration may result in a decrease of engine performance and engine brake performance.

PACCAR MX (2004 Emissions) Fault Code: P2579 Turbo Speed – Abnormal Rate of Change

SET CONDITIONS:
The PCI ECU (D420) detects that the measured turbo-speed signal is out of range or changing abnormally.

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

POSSIBLE CAUSES:
1. Exhaust gas leakage between engine and VTG turbocharger
2. Displaced turbo-speed sensor (loosened sensor bolt)
3. Faulty turbo speed sensor wiring
4. Faulty turbo speed sensor

ADDITIONAL INFORMATION:
1. The turbo speed is measured by the turbo speed sensor (F683).
2. Engine torque is reduced.

PACCAR MX (2004 Emissions) Fault Code: P2580 Turbo Speed – Data Valid but Too Low, Least Severe on ECU (D420) Pin (C87)

SET CONDITIONS:
The PCI ECU (D420) detects that the turbo speed is below 30,000 rpm for more than 20 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs when the engine speed is above 1000 rpm, and the engine is moderately loaded.

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

POSSIBLE CAUSES:
1. Exhaust gas leakage between engine and VTG turbocharger
2. Loose turbo speed sensor (air gap too large)
3. Malfunction on the turbo speed sensor wiring
4. Malfunction on the turbo speed sensor
5. Restriction in exhaust or aftertreatment system

ADDITIONAL INFORMATION:
1. Turbo speed is measured by the turbo speed sensor (F683).
2. Engine torque is reduced when this DTC is active.

PACCAR MX (2004 Emissions) Fault Code: P2581 Turbo Speed – Data Valid but Too High, Least Severe on ECU (D420) Pin (C87)

SET CONDITIONS:
The PCI ECU (D420) detects that the turbo speed is above 130,000 rpm.

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

POSSIBLE CAUSES:
1. Malfunction on the turbo-speed sensor wiring
2. Malfunction on the turbo-speed sensor
3. Vibrations of the turboshaft due to a foreign object damage on the compressor or turbine wheel

ADDITIONAL INFORMATION:
1. Turbo speed is measured by the turbo speed sensor (F683).
2. Engine torque is reduced when this DTC is active.

PACCAR MX (2004 Emissions) Fault Code: P2600 Coolant Pump – Open Circuit on ECU (D420) Pin (C1)

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

ADDITIONAL INFORMATION:
1. The two-stage clutch coolant pump can run at two different speeds. At high speed, the pump is driven directly by the crankshaft with the poly-V-belt ratio. Low speed is approximately 50% of high speed.

2. When this DTC is active the coolant pump only runs at low speed.

3. P00B7 may also become active when the coolant pump is controlled to run at high speed.

PACCAR MX (2004 Emissions) Fault Code: P2604 Coolant Pump – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (C1)

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

ADDITIONAL INFORMATION:
1. The two-stage clutch coolant pump can run at two different speeds. At high speed, the pump is driven directly by the crankshaft with the poly-V-belt ratio. Low speed is approximately 50% of high speed.

2. When this DTC is active, the pump only runs at low speed.

PACCAR MX (2004 Emissions) Fault Code: P2605 Coolant Pump – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (C1)

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.

RESET CONDITION:
The DTC changes to inactive after the diagnostic runs and passes.

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:
The two-stage clutch coolant pump can run at two different speeds. At high speed, the pump is driven directly by the crankshaft with the poly-V-belt ratio. Low speed is approximately 50% of high speed.