Massey Ferguson 04.1.12 – Transmission Module (TRANS / TRANS1) / Autotronic 5 (CAB151): Reverse Clutch Solenoid Amp Draw Issue

The transmission controller is detecting an abnormal electrical current draw from the reverse clutch solenoid circuit. This usually means the measured current is either exceeding the maximum possible threshold (e.g., >1.4 A, indicating a short circuit to +12V) or falling below the specified limit (indicating an open circuit or failing coil).

• 4707
• 4708
• 4709
• 4710
• T4 (2015-2021)
• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5400 Series
• 6400 Series
• 6600 Series
• 7600 Series
• 5700 Series
• 6700 Series
• 6S Series
• 7S Series

1. 1

   Remove the controller cover from the rear of the tractor. Visually inspect the wiring harness running from the transmission controller (Autotronic 5) to the transmission solenoid bank under the cab. Look for chafing, pinched wires, or melted insulation.

2. 2

   Disconnect the reverse clutch solenoid. Measure the resistance across the solenoid pins. A healthy coil should read approximately 10 ohms. If it reads completely open (infinite resistance) or is shorted, the solenoid coil has failed. Note: Solenoid coils often fail when they get hot; if the problem is temperature-sensitive, the coil is likely breaking down under load.

3. 3

   Measure the resistance between the harness connector cavity (power supply wire) and the chassis ground. If the resistance is very low (less than a few ohms), the wiring harness is shorted to ground somewhere between the controller and the solenoid.

1. 1

   Replacement

   Locate the forward/reverse valve block on the side of the transmission. Clean the area thoroughly to prevent dirt ingress. Disconnect the electrical connector, unbolt the faulty reverse clutch solenoid, and install the replacement.

2. 2

   Warm-Up

   Start the tractor. The transmission oil temperature must be brought up to between 35°C (95°F) and 45°C (113°F) (or 15-60°C depending on the exact manual version). You can monitor this via the dash diagnostic screen.

3. 3

   Component Priming

   Before initiating calibration, move the Power Shuttle lever forward and reverse 10 times, leaving it in each position for 5 to 10 seconds. This ensures the new solenoid valve and control unit are warmed up to the transmission fluid temperature.

4. 4

   Calibration

   Position the tractor on flat ground. Run the engine at 1500 RPM (± 100 RPM). Engage the power shuttle and differential lock simultaneously for 3 seconds, then shift the power shuttle lever to trigger the automatic calibration process (which takes about 2 minutes).

5. 5

   Validation

   Test drive the tractor, performing several forward and reverse maneuvers to ensure smooth shifting and verify the code does not return.