Massey Ferguson 00.02.54 – Dash (Instrument Panel): Issue With Signal Voltage From Air Brake pressure Sensor (Dash)

The control module is receiving an electrical signal from the pneumatic brake system pressure sensor (X168) that is out of the expected range. This typically points to a voltage that is either too high (short to power) or too low (open circuit or short to ground).

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 4700
• 5600
• 5700SL
• 7600
• 8600

1. 1

   Visual Inspection: Locate the pneumatic brake system pressure sensor (X168) on the air brake manifold/valve assembly. Inspect the sensor connector and wiring harness for rub points, corrosion, or loose pins.

2. 2

   Voltage Test: Use a multimeter to check the reference voltage coming from the Dash to the sensor.

3. 3

   Signal Circuit Test: Check the signal wire for a short to ground, short to power, or an open circuit between the sensor connector and the Dash module.

4. 4

   Live Data: If you have a diagnostic scanner (like Jaltest or AGCO EDT), check the live data for the air brake pressure sensor to see if the voltage is pegged at 0V or 5V, which confirms a hard electrical fault.

1. 1

   Power Down

   Turn off the tractor, remove the key, and disconnect the battery to prevent electrical spikes during repair.

2. 2

   Depressurize

   Ensure the pneumatic air brake system is fully depressurized before removing the sensor to avoid injury.

3. 3

   Disconnect

   Unplug the electrical connector from the X168 air brake pressure sensor.

4. 4

   Harness Repair (If Applicable)

   If the diagnostic checks revealed a broken wire or corroded connector, splice in a repair pigtail or clean the connector pins.

5. 5

   Sensor Replacement

   If the wiring is intact, unscrew the faulty air brake pressure sensor from the pneumatic manifold. Install the new sensor and tighten it to the specified torque (refer to the hydraulic/pneumatic union torque specs in the manual).

6. 6

   Reassembly

   Plug the electrical connector back in, reconnect the battery, and start the tractor.

7. 7

   Clear Codes

   Use a diagnostic tool to clear the 00.02.54 fault code and verify that the dash warning lights extinguish.