Massey Ferguson 04.03.70 – TRANS: Cruise Speed C1 Button Issue (TRANS)

The onboard diagnostic (OBD) system has detected an irregularity, malfunction, or loss of signal from the "C1" button. This button is located on the tractor's multifunction joystick (or multipad) and is used by the operator to engage or switch to the "C1" cruise control speed.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 5600 Series
• 5700 Series
• 6600 Series
• 6700 Series
• 7600 Series
• 7700 Series
• 7700S Series

1. 1

   Inspect the C1 button on the multifunction joystick for physical damage, sticking, or lack of tactile feedback. A collapsed or jammed button spring is a common mechanical failure.

2. 2

   Inspect the wiring harness exiting the base of the joystick and routing through the armrest. Look for pinched wires or loose connector pins that could interrupt the signal to the Transmission module.

3. 3

   Use a specialized Massey Ferguson diagnostic tool to clear the DTC. Cycle the tractor's ignition and press the C1 button to see if the code returns immediately (indicating a hard electrical fault like an open/short) or intermittently.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to prevent electrical shorts while working on the armrest console.

2. 2

   Access the Joystick

   Remove the retaining screws on the right-hand armrest console to access the underside of the multifunction joystick.

3. 3

   Button Replacement (If applicable)

   If your joystick allows for individual button replacement, carefully pry the faulty C1 button from its housing. Disconnect the micro-switch wiring, connect the new push button (e.g., Part # 600247), and snap it back into the joystick faceplate.

4. 4

   Assembly Replacement (If applicable)

   If the entire joystick is worn or the button cannot be serviced separately, disconnect the main electrical harness connector at the base of the joystick. Unbolt the joystick assembly from the armrest and install the new unit (e.g., Part # 600109).

5. 5

   Reassembly

   Secure the joystick, reassemble the armrest console, and reconnect the battery.

6. 6

   Calibration/Testing

   Turn the tractor on, clear the 04.03.70 fault code using a diagnostic tool, and test the C1 cruise speed function during operation to verify the repair.