New Holland 2075 – ECM/TCM: No Signal From Flywheel Speed Sensor

The Transmission Control Module (TCM) has detected an invalid signal from the flywheel speed sensor (also known as the engine or crankshaft speed sensor). This fault is triggered when the sensor frequency is too high, the signal period is too short (under 400 microseconds), a short signal period is longer than the corresponding long period, no usable signal is received while the engine RPM is greater than 300, the calculated torque exceeds the calibrated peak torque by more than 25%, or the damper angle is calculated to be below 50 degrees or above 85 degrees. Because the transmission controller relies on this engine speed data to manage clutch engagement and gear shifting, an invalid signal can disrupt transmission operation and illuminate dashboard warning symbols.

• TS90
• TS100
• TS110
• TS115
• TS100A
• TS110A
• TS115A
• TS125A
• TS130A
• TS135A
• TM115
• TM120
• TM125
• TM130
• TM135
• TM140
• TM150
• TM155
• TM165
• TM175
• TM190
• TL70
• TL80
• TL90
• TL100
• T6010
• T6020
• T6030
• T6040
• T6050
• T6060
• T6070
• T6080
• T6090
• T7030
• T7040
• T7050
• T7060
• T6.120
• T6.140
• T6.145
• T6.155
• T6.160
• T6.165
• T6.175
• T6.180
• T7.165
• T7.170
• T7.175
• T7.185
• T7.190
• T7.210
• T7.220
• T7.225
• T7.230
• T7.235
• T7.245
• T7.250
• T7.260
• T7.270
• 5640
• 6640
• 7740
• 7840
• 8240
• 8340
• 8160
• 8260
• 8360
• 8560
• MXM120
• MXM130
• MXM140
• MXM155
• MXM175
• MXM190
• Puma 130
• Puma 140
• Puma 145
• Puma 150
• Puma 160
• Puma 165
• Puma 170
• Puma 180
• Puma 185
• Puma 195
• Puma 200
• Puma 210
• Puma 215
• Puma 220
• Puma 225
• Puma 240
• Maxxum 110
• Maxxum 115
• Maxxum 120
• Maxxum 125
• Maxxum 130
• Maxxum 135
• Maxxum 140
• Maxxum 145
• Maxxum 150
• MXU100
• MXU110
• MXU115
• MXU125
• MXU135

1. 1

   Visually inspect the sensor and its wiring for visible damage, such as a cracked sensor tip, corrosion, oil saturation, cuts, or loose connections

2. 2

   Inspect the 2-pin or 3-pin connector to ensure it is securely plugged in and free of dirt, moisture, or corrosion

3. 3

   Check for related fault codes that may indicate specific circuit issues, such as 2076 (Flywheel Speed Sensor Open Circuit) or 2077 (Flywheel Speed Sensor Short Circuit)

4. 4

   Test the sensor's output by measuring the frequency or voltage signal at the sensor's connector while the engine is running, comparing against service manual specifications

1. 1

   Prepare machine for service

   Ensure the tractor's ignition is off and the battery is disconnected before beginning any repairs.

2. 2

   Locate the sensor

   Find the flywheel speed sensor on the transmission housing cover, flywheel bell housing, or rear axle differential assembly (on some models, it may be on the right side of the rear axle housing). Access may require removing components like a hydraulic filter.

3. 3

   Remove and inspect old sensor

   Carefully unplug the wiring harness and unscrew the old sensor from its mounting port (it may be very tight). Inspect the removed sensor for physical damage that could indicate contact with internal components.

4. 4

   Install the new sensor

   Clean the mounting port area thoroughly. Hand-thread the new sensor into the casing to avoid cross-threading. Adjust the air-gap clearance between the sensor and the tone wheel according to the service manual's specifications, then securely plug in the wiring harness.

5. 5

   Reconnect and test

   Reconnect the battery and turn on the ignition. Clear any fault codes and test the tractor to ensure the issue is resolved and systems operate correctly.