New Holland UCM 5507 – UCM: Auxiliary Valve Spool Sensor - Sensor Short to Ground / Open Circuit

This code is triggered when the control module detects that the signal voltage coming from the auxiliary hydraulic valve spool position sensor is either shorted to ground (STG) or the circuit is completely open (OC).

• L213
• L215
• L218
• L220
• L223
• L225
• L228
• L230
• C227
• C232
• C238
• SR130
• SR150
• SR175
• SV185
• SR200
• SR220
• SR250
• SV250
• SV300
• TR270
• TR320
• TV380

1. 1

   Inspect the Auxiliary Wiring harness (connector X-23) for chafed wires, pinched lines, or melted insulation near the hydraulic valve block.

2. 2

   Disconnect the Auxiliary Valve Spool Sensor and inspect the pins for corrosion, moisture ingress, or pushed-out terminals.

3. 3

   Test for Open Circuit (OC) by checking for continuity on the signal wire between the sensor connector and the UCM harness connector.

4. 4

   Test for Short to Ground (STG) by checking the sensor signal wire for continuity to the chassis ground.

5. 5

   Verify the sensor is receiving its 5V reference supply and has a clean ground from the UCM.

1. 1

   Park and relieve pressure

   Park the machine on a level surface, lower the boom completely, and relieve all hydraulic pressure.

2. 2

   Disconnect battery

   Turn off the ignition and disconnect the negative battery cable to prevent electrical spikes.

3. 3

   Access valve assembly

   Gain access to the primary Electro-Hydraulic (EH) control valve assembly (usually located under the cab).

4. 4

   Disconnect sensor

   Locate the Auxiliary Valve Spool Sensor on the valve block and disconnect its X-23 electrical connector.

5. 5

   Remove sensor

   Unthread/remove the faulty spool sensor from the valve body. Have a rag ready, as a small amount of hydraulic fluid may weep from the port.

6. 6

   Install new sensor

   Install the new spool sensor and tighten it to the OEM torque specification.

7. 7

   Reconnect and restore power

   Reconnect the X-23 harness connector and restore battery power.

8. 8

   Clear fault code

   Use an Electronic Service Tool (EST) or the machine's onboard display to clear the UCM 5507 fault code.

9. 9

   Test machine

   Start the machine and test the auxiliary hydraulic functions to verify the repair and ensure the code does not return.