Applicable Systems
PC200 Excavator
Symptoms
Fuel temperature sensor reading abnormally high; ECM may adjust fuel delivery incorrectly.
Possible Causes
- Fuel temp sensor short to +5V supply
- Sensor internal open circuit
- Sensor connector corrosion
Troubleshooting Steps
- Step 1: Check fuel temp sensor voltage at key ON
Voltage 0.5-4.5V range - Step 2: Inspect sensor connector for corrosion
Connector clean - Step 3: Check signal wire for short to +5V
No short to +5V - Step 4: Replace fuel temp sensor if voltage high
New sensor voltage within range - Step 5: Clear code and verify fuel temp reading
Temperature reads normal
How to Reset
Clear via service monitor after sensor replacement.
Common Replacement Parts
- Fuel Temperature Sensor P/N: 621-06-18100
Frequently Asked Questions
- Q: Does fuel temperature affect engine operation?
Yes. ECM adjusts injection timing and fuel quantity based on fuel density which changes with temperature. Faulty sensor can cause rough running.
Comments (0)
Share your experience to help others facing the same problem.
Leave a Comment
Source: truckmanualshub.com Komatsu PDF
Category: Heavy Equipment
No comments yet. Be the first to share your experience!