Paccar

PACCAR MX (2004 Emissions) Fault Code: P1571 Engine Oil Temperature – Data Erratic, Intermittent, or Incorrect

SET CONDITIONS:
The PCI ECU (D420) detects that the measured oil temperature differs too much from the expected oil temperature for more than 300 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs 60 seconds after an engine start, and when the coolant temperature is more than 65?C [149?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:
Oil temperature sensor deviation

ADDITIONAL INFORMATION:
1. For this diagnostic, the engine oil temperature is compared with the engine coolant temperature when the engine is at normal operating temperature.

2. The oil temperature is monitored by the oil temperature sensor (F808), and the engine coolant temperature is monitored by the coolant temperature sensor (F566).

PACCAR MX (2004 Emissions) Fault Code: P1572 Inlet Air Temperature After Compressor – Data Erratic, Intermittent, or Incorrect

SET CONDITIONS:
The PCI ECU (D420) calculates that the inlet air temperature after turbo compressor differs too much from the expected value.

DIAGNOSTIC CONDITION:
This diagnostic runs:
1. 180 seconds after the ignition has been keyed on
2. When the engine speed is above 1050 rpm
3. When the engine is running at a moderate and steady load

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:
The inlet air temperature after compressor of the turbocharger is calculated by the PCI ECU.

PACCAR MX (2004 Emissions) Fault Code: P1573 Inlet Air Temperature in Inlet Manifold – Data Valid but Too High

SET CONDITIONS:
The PCI ECU (D420) detects that the boost temperature is more than 127?C [261?F] for more than 120 seconds.

DIAGNOSTIC CONDITION:
The diagnostic runs 180 seconds after the engine is started.

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. Contaminated intercooler
2. Faulty engine cooling fan
3. Boost temperature sensor deviation

ADDITIONAL INFORMATION:
The boost temperature is measured in the inlet manifold near cylinder 2 by the boost temperature sensor (F804).

PACCAR MX (2004 Emissions) Fault Code: P1574 Exhaust Gas Pressure Before Turbine – Data Erratic, Intermittent or Incorrect

SET CONDITIONS:
The PCI ECU (D420) detects that the measured pressure before turbine is above 6.0 bar [87 psi] during an engine braking event.

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

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

POSSIBLE CAUSES:
1. Malfunction of the VTG turbocharger control, BPV valve control, or EGR valve control. Check for relevant DTCs.
2. Pressure sensor before turbine deviation

ADDITIONAL INFORMATION:
1. An automated transmission can request a shift assist event on the engine in order to reduce the engine speed quickly. The engine can use the engine brake to achieve this.

2. The PCI ECU uses the pressure before turbine for, among other things, controlling the VTG turbocharger, EGR valve position, BPV valve position and engine braking.

3. The pressure before turbine is measured by the pressure sensor before turbine (F826).

PACCAR MX (2004 Emissions) Fault Code: P1580 Turbo Speed – Data Valid but Too High

SET CONDITIONS:
The PCI ECU (D420) detects that the turbo speed is above 140,000 rpm for more than 20 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs:
1. When engine speed is below 1900 rpm and
2. The engine is moderately loaded and
3. The VTG turbocharger position is greater than 10%

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. Malfunction on the turbo-speed sensor wiring
2. Malfunction on the turbo-speed sensor

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: P1581 Turbo Speed – Data Valid but Too Low

SET CONDITIONS:
The PCI ECU (D420) detects a too low value from the turbocharger speed sensor.

DIAGNOSTIC CONDITION:
This diagnostic runs:
1. When the engine speed is above 1000 rpm and
2. The engine is loaded and
3. The VTG turbocharger position is less than 95%.

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 before the VTG turbocharger
2. Incorrectly fitted or loose turbocharger speed sensor (too large air gap)
3. Malfunction on the turbocharger speed sensor wiring
4. Malfunction on the turbocharger speed sensor
5. Restriction in exhaust or aftertreatment system

ADDITIONAL INFORMATION:
1. When P1581 is ACTIVE, the displayed turbo speed in the diagnostic service tool monitor is a calculated value based on a software model.
2. The turbo speed is measured by the turbocharger speed sensor (F683)
3. Engine torque is reduced when this DTC is active.

PACCAR MX (2004 Emissions) Fault Code: P1601 PCI ECU – Internal Error

SET CONDITIONS:
Programmed data in the ECU not correct.

DIAGNOSTIC CONDITION:
This diagnostic runs during start-up of the PCI ECU.

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:
Software fault

ADDITIONAL INFORMATION:
1. The PCI ECU does not start up.
2. Engine cannot be started.

PACCAR MX (2004 Emissions) Fault Code: P1602 PCI ECU – Software Error

SET CONDITIONS:
Programmed data in the ECU not correct.

DIAGNOSTIC CONDITION:
This diagnostic runs during start-up of the PCI ECU.

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

POSSIBLE CAUSES:
Software fault

ADDITIONAL INFORMATION:
1. The PCI ECU does not start up.
2. Engine cannot be started.

PACCAR MX (2004 Emissions) Fault Code: P160A PCI ECU – Internal Error

SET CONDITIONS:
Programmed software in the ECU not functioning correctly.

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:
This fault indicates an internal ECU error.

ADDITIONAL INFORMATION:
1. Software does not function correctly.
2. Unpredictable software reactions.
3. Functionality is not guaranteed anymore.