PACCAR MX (2004 Emissions) Fault Code: P0335 Crankshaft Speed Signal – Disturbed or No Signal During Engine Operation

PACCAR MX (2004 Emissions) Fault Code: P0335 Crankshaft Speed Signal – Disturbed or No Signal During Engine Operation

SET CONDITIONS:
The PCI ECU (D420) detects that one or more holes in the flywheel are not detected within one crankshaft revolution.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the engine is running.

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:
1. No crankshaft sensor signal
2. Faulty crankshaft sensor signal
3. Damaged flywheel

ADDITIONAL INFORMATION:
1. Crankshaft sensor (F552) is used to determine the crankshaft speed and position.
2. It is possible that the camshaft sensor (F558) is used as backup to run the engine.
3. Engine torque is reduced.

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