New Holland 80 – Transmission: Wheel Speed Sensor Reading Too High

The transmission control module has detected a signal from the wheel speed sensor that indicates a rotational speed implausibly higher than the actual value. This out-of-range signal can be caused by a faulty sensor, wiring harness issues, an incorrect air gap, or tone ring damage. This fault directly affects speed-related systems, potentially causing erratic speedometer readings and limiting the transmission's ability to shift into higher gears.

• T6010
• T6020
• T6030
• T6040
• T6050
• T6060
• T6070
• T6080
• T6090
• T7030
• T7040
• T7050
• T7060
• T7070
• TM110
• TM115
• TM120
• TM125
• TM130
• TM135
• TM140
• TM150
• TM155
• TM165
• TM175
• TM180
• TM190
• TS100A
• TS110A
• TS115A
• TS125A
• TS135A
• TND
• TNF
• TNS
• T6

1. 1

   Visually inspect the wheel speed sensor and wiring harness for cuts, pinching, or abrasions.

2. 2

   Check electrical connectors between the sensor and transmission controller for corrosion, damage, or loose connections.

3. 3

   Inspect the tone ring (reluctor ring) for damage, missing teeth, or metallic debris accumulation that could interfere with the magnetic pickup.

4. 4

   Perform a resistance test on the disconnected sensor (should read 900-2000 ohms across pins, and infinite resistance to chassis ground).

5. 5

   Perform an AC voltage output test by safely raising the wheel and rotating it at approximately 0.5 revolutions per second (should produce a minimum of 0.2 volts AC).

6. 6

   Check the wiring harness for continuity and shorts from the sensor connector back to the transmission controller.

1. 1

   Disconnect power

   Disconnect the tractor's battery before starting the replacement to prevent electrical issues.

2. 2

   Locate and access sensor

   Locate the wheel speed sensor on the right side of the rear axle housing. Remove components like the hydraulic filter if necessary for access.

3. 3

   Remove old sensor

   Disconnect the electrical connector. Remove the retaining bolt or use a twisting motion to pull out the press-fit sensor.

4. 4

   Inspect and clean

   Clean the mounting area thoroughly to ensure a proper fit and remove any debris that could affect the new sensor's reading.

5. 5

   Install new sensor

   Install any supplied spring clip or bushing. Lubricate the sensor and O-ring, then gently push it into place until it contacts the tone ring (it will self-adjust the air gap). Secure with the retaining bolt if applicable.

6. 6

   Reconnect components

   Reconnect the electrical connector, reinstall any removed access components (like the hydraulic filter), and reconnect the battery.

7. 7

   Clear fault codes

   Start the tractor and use the dashboard interface or a diagnostic tool to clear the active fault code 80.

8. 8

   Verify operation

   Operate the tractor to ensure the speedometer reads correctly and the transmission shifts properly through all gears.