Paccar

PACCAR MX (2004 Emissions) Fault Code: P1407 Crankcase Air Pressure – Leakage Detected

SET CONDITIONS:
The PCI ECU (D420) detects that the measured crankcase pressure is too high for more than 30 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs 600 seconds after the engine has been started and when the coolant temperature is higher than 60?C [140?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. Leakage on the crankcase ventilation pipe between the cylinder head cover and the crankcase ventilation module
2. Leakage on the crankcase pressure sensor bracket or pipe
3. Crankcase leakage (oil filler cap, dipstick)
4. Faulty crankcase ventilation module wiring
5. Faulty crankcase ventilation module
6. Valve seal(s) push up from valve guide(s)

ADDITIONAL INFORMATION:
The crankcase pressure is monitored with the crankcase pressure sensor (F806) against ambient pressure.

PACCAR MX (2004 Emissions) Fault Code: P1408 Crankcase Air Pressure – Data Valid but Too High, Moderately Severe

SET CONDITIONS:
The PCI ECU (D420) detects that the measured crankcase pressure is too high for more than 10 seconds.

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? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. Blocked or contaminated crankcase ventilation piping
2. Blocked or contaminated crankcase ventilation module

ADDITIONAL INFORMATION:
The crankcase pressure is monitored with the crankcase pressure sensor (F806) against ambient pressure.

PACCAR MX (2004 Emissions) Fault Code: P1409 EGR Pressure – Data Valid but Too High

SET CONDITIONS:
The PCI ECU (D420) detects that the measured boost pressure is higher than 4.5 bar [65 psi] to control the EGR gas mass flow.

DIAGNOSTIC CONDITION:
This diagnostic runs when the engine speed is above 1100 rpm.

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:
Faulty turbocharger

ADDITIONAL INFORMATION:
1. The engine NOx emission is, among others, controlled by varying the EGR gas mass flow toward the inlet manifold of the engine.
2. The EGR gas mass flow is calculated using the EGR pressure difference sensor (F751) and the EGR temperature sensor (F749).
3. The boost pressure is measured by the boost pressure sensor (F802).
4. EGR gas mass flow toward the inlet manifold of the engine is controlled by the EGR valve module (L095).

IMPORTANT: The EGR valve position does not just indicate the amount of EGR flow to the inlet manifold. The amount of EGR gas fed back mainly depends on the pressure difference between the pressure before turbine and the boost pressure, in combination with the EGR valve position.

PACCAR MX (2004 Emissions) Fault Code: P1458 EGR Temperature – Data Erratic, Intermittent, or Incorrect

SET CONDITIONS:
The PCI ECU (D420) detects that measured EGR gas flow temperature differs too much from the expected EGR gas flow temperature for more than 40 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs:
1. 150 seconds after an engine start
2. When the coolant temperature is above 65?C [149?F] and
3. The engine mode is DOC heating or DPF regeneration or SCR heating or SCR high efficiency or standard or protection.

CORRESPONDING OBD READINESS MONITOR:
EGR system monitor

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 following conditions:
– Corresponding readiness monitor displays ‘Ready’
– Diagnostic conditions are met
– Set conditions are met
3. Did the DTC come back? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. Contaminated EGR cooler
2. Extremely high exhaust gas temperatures
3. EGR temperature sensor deviation

ADDITIONAL INFORMATION:
The EGR gas flow temperature is monitored by the EGR temperature sensor (F749).

PACCAR MX (2004 Emissions) Fault Code: P1480 EGR Valve Module Position – Unable to Reach Target

SET CONDITIONS:
The EGR valve module (L095) detects a difference between the actual shaft position and the requested shaft position for more than 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 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. Bent actuator lever and/or link rod
2. Sticking or blocked EGR valve or mechanism

ADDITIONAL INFORMATION:
1. The position of the actuator shaft, and therefore the position of the EGR valve, is monitored. Valve position: 0% is fully closed and 100% is fully open.
2. The actuator motor is switched off and the EGR valve is fully closed (0% position).
3. Engine torque is reduced after 10 hours of engine operation.

PACCAR MX (2004 Emissions) Fault Code: P1481 EGR Valve Module Current – Data Valid but Too High

SET CONDITIONS:
The EGR valve actuator (L095) detects that the measured actuator current is greater than a temperature-dependent value for more than 6 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:
1. Sticking or blocked EGR valve or mechanism
2. High friction of the EGR valve bearings or mechanism in combination with a high actuator temperature

ADDITIONAL INFORMATION:
1. The actuator motor torque is reduced with this fault active. Under certain circumstances this can result in the actuator not being able to reach the target position and P1480 becoming active also.

2. After 36 hours of engine operation with P1481 active, P1518 becomes active.

3. After 100 hours of engine operation with P1481 active, P151A and/or P151B become active.