Case IH t3C – Transmission Controller: Solenoid Valve, Data Valid But Below Normal Range

This fault indicates that the controller is receiving a signal from a Pulse-Width Modulation (PWM) transmission solenoid valve that falls below the expected normal operating threshold. This typically points to high electrical resistance, a partial open circuit in the wiring harness, or a failing solenoid coil.

• MXM
• MXM 120
• MXM 130
• MXM 140
• MXM 155
• MXM 175
• MXM 190
• Maxxum 110
• Maxxum 115
• Maxxum 120
• Maxxum 125
• Maxxum 130
• Maxxum 135
• Maxxum 140
• Maxxum 145
• Puma 160
• Puma 165
• Puma 170
• Puma 185
• Puma 200
• Puma 215
• TM Series (TM115-TM165)
• T5 Series
• T6 Series
• T7 Series

1. 1

   Inspect the wiring harness and connectors leading to the transmission central reduction gear controls/valve block for corrosion, moisture, or chafed wires that could cause high resistance.

2. 2

   Disconnect the suspected PWM solenoid and measure the resistance across the coil pins to check for an internal open or short.

3. 3

   Check the voltage supply and ground continuity from the Transmission Controller to the solenoid connector to rule out a broken wire.

4. 4

   Clear the non-volatile memory in the controller and see if the code returns immediately upon key-on or only during specific shifts.

1. 1

   Prepare tractor for service

   Park the tractor on a level surface, lower all implements to the ground, place all shift levers in neutral, block the wheels, and disconnect the battery.

2. 2

   Locate valve block

   Locate the transmission control valve block (central reduction gear controls) on the side of the transmission housing.

3. 3

   Disconnect solenoid

   Disconnect the electrical connector from the faulty PWM solenoid valve.

4. 4

   Remove solenoid

   Remove the retaining hardware (plugs/screws) holding the solenoid in place and carefully extract the valve.

5. 5

   Install new solenoid

   Lubricate the O-rings on the new solenoid valve and install it into the valve block. Secure it with the retaining hardware.

6. 6

   Reconnect electricals

   Reconnect the electrical harness and the battery.

7. 7

   Perform transmission calibration

   Start the engine and warm up the transmission fluid. Hold the High and Low range buttons to enter calibration mode ('CAL' will appear on the transmission display). Set the engine speed to 1200 RPM (± 100). Follow the on-screen prompts to calibrate the clutch and synchronizers.