PACCAR MX (2004 Emissions) Fault Code: P0087 Fuel Pressure - Data Valid but Too Low, Most Severe

PACCAR MX (2004 Emissions) Fault Code: P0087 Fuel Pressure - Data Valid but Too Low, Most Severe

SET CONDITIONS:
The PCI ECU (D420) detects that the fuel pressure is too low for more than 5 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs when the engine has been running for more than 200 seconds.

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
1. This DTC changes to inactive when the fault is no longer detected.
2. This fault cannot be cleared from the ECU memory.

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. Faulty fuel pressure control valve
2. Restriction in the fuel supply or low performance of the fuel lift pump

ADDITIONAL INFORMATION:
1. The low-pressure fuel pressure is measured by the fuel pressure sensor (F801).
2. Engine torque is reduced when this DTC is active.

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