Applicable Systems
EMCP 4.2
Symptoms
Hydraulic pump 2 flow control signal lost; pump 2 output may not respond to commands; asymmetrical hydraulic performance.
Possible Causes
- Pump 2 flow control solenoid signal lost
- Pump controller output circuit failure
- Wiring harness damage at pump 2
Troubleshooting Steps
- Step 1: Check pump 2 flow control solenoid resistance
Resistance 10-20 ohm - Step 2: Inspect pump 2 solenoid wiring
Wiring intact - Step 3: Test solenoid with Cat ET output test
Solenoid activates - Step 4: Replace solenoid if no response
New solenoid responds - Step 5: Clear code and calibrate pump 2 flow control
Pump 2 flow matches command
How to Reset
Clear via Cat ET; requires pump 2 flow calibration.
Common Replacement Parts
- Pump 2 Flow Control Solenoid P/N: 205-1557
Frequently Asked Questions
- Q: Why does Cat excavator have two hydraulic pumps?
Dual pumps provide independent flow to left and right travel motors, and can combine flow for implement functions for faster cycle times.
Source: caterpillarfaultcodes.com CID list
Category: Heavy Equipment