Applicable Systems
EMCP 4.2
Symptoms
Pump outlet pressure sensor signal erratic; hydraulic system may not optimize flow/pressure correctly.
Possible Causes
- Pump pressure sensor internal failure
- Sensor wiring intermittent connection
- Hydraulic pulsation causing sensor noise
Troubleshooting Steps
- Step 1: Monitor pump pressure on Cat ET live data
Pressure reading stable at idle - Step 2: Check sensor connector for loose pins
Connector tight, pins straight - Step 3: Inspect sensor wiring for intermittent breaks
Wiring continuity good - Step 4: Replace pump pressure sensor if signal erratic
New sensor signal stable - Step 5: Clear code and verify pressure monitoring
Pressure tracks load accurately
How to Reset
Clear via Cat ET after sensor replacement.
Common Replacement Parts
- Pump Pressure Sensor P/N: 205-1558
Frequently Asked Questions
- Q: What is normal pump pressure at idle?
Idle pressure typically 30-50 bar. Working pressure 200-350 bar depending on load. Check model-specific specs.
Source: caterpillarfaultcodes.com CID list
Category: Heavy Equipment