Applicable Systems
DX280 Excavator
PUMA MX Series
PUMA TT Series
Symptoms
The ECM detects the oil pressure sensor signal voltage is above 4.8V, indicating a short to battery positive. Engine power may be reduced and speed may decrease.
Possible Causes
- Sensor signal wire shorted to battery positive or ground
- Sensor internal failure producing out-of-range voltage
- ECM connector corrosion causing cross-circuit between pins
- Wiring harness chafing exposing conductor to power or ground
Troubleshooting Steps
- Step 1: Read active fault codes on the monitor panel or using ET (Electronic Technician)
Fault code displayed as active with engine status - Step 2: Disconnect the relevant sensor connector and measure signal pin voltage
Voltage should be 0V with sensor disconnected; if battery voltage present, wiring is shorted - Step 3: Inspect wiring harness from sensor to ECM for chafing or insulation damage
No exposed conductors or insulation damage found - Step 4: Replace the sensor if wiring checks good but fault persists after reconnection
Fault clears after sensor replacement and key cycle
How to Reset
To reset: 1) Repair the short circuit or replace the faulty sensor. 2) Turn key OFF then ON. 3) Verify fault is no longer active. Caution: The ECM will use default values (600kPa for pressure, 90C for temperature) when sensor data is invalid, which may mask the real problem.
Frequently Asked Questions
- Q: What does Doosan ECM fault code 0100-03 mean?
Oil Pressure Sensor Short to Battery Positive. The ECM detects the oil pressure sensor signal voltage is above 4.8V, indicating a short to battery positive. Engine power may be reduced and speed may decrease.
- Q: What default values does the ECM use when sensor data is invalid?
The ECM uses 600kPa as default for fuel and oil pressure sensors, and 90 degrees C as default for coolant temperature. These defaults may not reflect actual conditions.
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Source: Doosan DX280 Excavator ECM Manual; 21-sun.com (China Construction Machinery Commerce Network); cehome.com; sohu.com
Category: Heavy Equipment
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