New Holland L02 – Front Axle Suspension microprocessor / Central Controller: Raising Solenoid Not Working

There is an electrical or functional failure in the raising solenoid circuit, which is a critical component of the tractor's Terraglide Front Axle Suspension system.

• TM115
• TM120
• TM125
• TM130
• TM135
• TM140
• TM150
• TM155
• TM165
• TM175
• MXM Series
• T7030
• T7040
• T7050
• T7060
• T7.175
• T7.185
• T7550
• T6010
• T6020
• T6030
• T6040
• T6050
• T6060
• T6070
• T4050 Supersteer

1. 1

   Inspect the raising solenoid connector C251 (identified with a Red Band) and the front suspension connector C248.

2. 2

   Verify connection integrity, ensuring the connectors are fully connected, undamaged, pins are in the correct position, and the fit is tight.

3. 3

   With the key start OFF, disconnect the solenoid connector and the central controller to test the wiring harness for continuity, open circuits, or shorts to ground.

4. 4

   Test the raising solenoid (PWM EDC valve) with a multimeter. The resistance of the solenoid should be between 6 and 8 ohms, and the signal frequency should be 83 Hz.

1. 1

   Locate the Fault

   Use the diagnostic checks above to isolate the fault to the connector, the wiring harness, or the solenoid itself.

2. 2

   Relieve Pressure

   If the solenoid valve must be replaced, relieve the hydraulic pressure in the suspension system (e.g., by screwing in the knurled-head screw on the suspension raising solenoid valve to relieve the rebound accumulator).

3. 3

   Repair/Replace

   If the harness is damaged, cut and replace the faulty wire/connector using a New Holland harness repair kit. If the solenoid fails the resistance test, remove and replace the raising solenoid valve.

4. 4

   Reassemble

   Reconnect all affected connectors and ensure the harness outer covering is secure.

5. 5

   Clear the Code

   Once the physical repair is complete, clear the error code from the microprocessor's non-volatile memory.

6. 6

   Calibrate the System

   If a PWM solenoid valve was replaced, a potentiometer was replaced, or a mechanical repair was effected, you must perform a suspension/transmission calibration procedure so the controller can relearn the valve thresholds.

7. 7

   Test

   Test the front axle suspension system for normal operation.