Applicable Systems
DX280 Excavator
PUMA MX Series
PUMA TT Series
Symptoms
AC/DC conversion anomaly detected. The analog-to-digital converter in the controller is malfunctioning, causing inaccurate sensor readings.
Possible Causes
- Sensor or wiring harness fault (open circuit, short circuit, or corrosion)
- Controller internal fault (EEPROM, RAM, or A/D converter failure)
- Sensor calibration drift or sensor element degradation
- Wiring connector loose, corroded, or water ingress
Troubleshooting Steps
- Step 1: Read the active fault code on the excavator monitor panel
Fault code displayed with status and timestamp - Step 2: Inspect the relevant sensor and wiring harness for visible damage, corrosion, or loose connections
Wiring intact, connectors clean and seated properly - Step 3: Disconnect the sensor connector and measure signal voltage with key ON
Voltage within the sensor specified range (typically 0.5-4.5V for analog sensors) - Step 4: If wiring checks good, replace the sensor and clear the fault code
Fault clears after sensor replacement and key cycle
How to Reset
To reset: 1) Repair or replace the faulty sensor or wiring. 2) Turn the key OFF then ON to clear the code. 3) Start the engine and verify the fault is no longer active. Caution: Do not operate the excavator with active system faults as it may cause hydraulic pump or engine damage.
Frequently Asked Questions
- Q: What does Doosan excavator fault code 03 mean?
A/D Conversion Anomaly. The analog-to-digital converter in the controller is malfunctioning, causing inaccurate sensor readings.
- Q: Can I continue operating the excavator with this fault active?
It depends on the severity. Critical faults (01, 02, 20, 21) require immediate shutdown. Major faults should be investigated at the next opportunity. Minor faults may allow limited operation.
Source: Doosan DX280 Excavator Service Manual; 21-sun.com (China Construction Machinery Commerce Network); cehome.com; sohu.com
Category: Heavy Equipment