PACCAR MX (2004 Emissions) Fault Code: P1089 Common Rail Fuel Pressure – Data Valid but Too High
PACCAR MX (2004 Emissions) Fault Code: P1089 Common Rail Fuel Pressure – Data Valid but Too High
SET CONDITIONS:
The PCI ECU (D420) detects that the measured rail pressure is more than 2840 bar [41191 psi].
DIAGNOSTIC CONDITION:
This diagnostic runs when the rail pressure operating state is: Pump unit only or Rail discharge.
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 common rail pump unit
ADDITIONAL INFORMATION:
1. The rail pressure is measured in the common rail by the common rail pressure sensor (F854).
2. When this DTC is active:
– The engine torque is reduced.
– The engine runs in protection mode.
– The engine runs in rail pressure control state: Release valve only.
– The maximum rail pressure is limited to 1300 bar.
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