PACCAR MX (2004 Emissions) Fault Code: P0168 Fuel Temperature – Data Valid but Too High, Most Severe

PACCAR MX (2004 Emissions) Fault Code: P0168 Fuel Temperature – Data Valid but Too High, Most Severe

SET CONDITIONS:
The PCI ECU (D420) detects that the fuel temperature is above 98°C [208°F] for greater than 30 seconds.

DIAGNOSTIC CONDITION:
This diagnosis runs continuously when the ignition is keyed ON.

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
1. This DTC changes to INACTIVE after the diagnosis runs and passes.
2. This DTC cannot be cleared from the ECU memory.

REPAIR VERIFICATION:
1. Contact your engine field service representative for authorization to clear the warranty DTC.
2. Clear all DTCs.
3. Test drive or operate the vehicle to meet the diagnostic conditions and set conditions.
4. Did the DTC come back? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. Restriction in the fuel-to-tank return circuit.
2. A low fuel level and a high ambient temperature in combination with a leaking common rail pressure release valve (L094).

ADDITIONAL INFORMATION:
1. The low-pressure fuel temperature is measured by the fuel temperature sensor (F803).
2. Engine torque is reduced when this DTC is ACTIVE.