PACCAR MX (2004 Emissions) Fault Code: P1484 EGR Valve Module – Internal Error
PACCAR MX (2004 Emissions) Fault Code: P1484 EGR Valve Module – Internal Error
SET CONDITIONS:
The EGR valve module (L095) 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 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. High friction or sticking EGR valve bearings or mechanism
2. Blocked EGR valve
ADDITIONAL INFORMATION:
1. The actuator current is monitored.
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.
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