Caterpillar Fault Code
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Fuel Lift Pump Failure
Variant 1
System
Electrical
Symptom
Fuel Lift Pump Failure
Diagnosis & fix steps
LOGIC: Electric Fuel Priming Pump Current Below Normal.
ACTION: Measure resistance at the priming pump motor pins. If "Open Loop," the internal motor brushes are gone.
Red Seal field insights
Location: Usually found near the primary fuel filter base.
FIX: Replace the 24V priming pump assembly.
Variant 2
System
Aftertreatment
Symptom
Regen Fails / Engine Derate
Diagnosis & fix steps
LOGIC: ARD Fuel Flow Diverter Valve Current Below Normal (Open Circuit).
ACTION: Check for 24V supply and verify coil resistance at the actuator pins.
Red Seal field insights
Specs: 15 to 30 Ohms.
PRO-TIP: On the 336, the diverter valve is usually near the fuel manifold. If resistance is high, the internal coil is failing.
Variant 3
System
Engine
Symptom
Rough Run / Miss
Diagnosis & fix steps
LOGIC: Ignition Coil #3 Current Below Normal.
ACTION: Measure coil primary resistance. If OL, replace coil.
Red Seal field insights
CAT 336: Check harness for heat damage near the exhaust manifold.
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