Kobelco P0340 Speed Sensor Troubleshooting | Slow Start & Hard Start Fix
Overview
P0340 is a common fault code on Kobelco excavators, meaning Engine Speed Sensor abnormality. The typical symptom is: engine starts with long delay after shutdown. This fault only relates to the speed sensor, its plug and related wiring.
Image: Kobelco P0340 fault code displayed on monitor
What is P0340 Fault?
Fault Code: P0340
Name: Engine Speed Sensor Malfunction
Main Symptom: Engine slow start / hard start after shutdown
Related Parts: Speed sensor, connector plug, wiring harness
Step-by-Step Troubleshooting for P0340
Locate the engine speed sensor on the engine
Check the sensor plug for looseness, corrosion, oil contamination
Check the wiring harness for damage, short circuit, open circuit
Check sensor mounting position and gap
Replace the speed sensor if damaged
Image: Engine sub speed sensor installation position
Conclusion
If your Kobelco shows P0340 and has slow start / hard start, just check 3 things:
1. Sub speed sensor
2. Plug connector
3. Wiring harness
Most can be fixed by replacing the sensor.
