John Deere 161.02 – PTA / TCU: Transmission Input Speed Issue

The control unit detects a sudden and inexplicable drop in the transmission input speed to 0 rpm while the machine is operating, indicating a malfunction of the B61 Transmission Input Speed Sensor or an issue within its electrical circuit.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6230
• 6330
• 6430
• 540G-III
• 548G-III
• 540H
• 548H
• 640H
• 648H
• 748H
• 848H
• 5075GV
• 5090GV
• 5075GN

1. 1

   Inspect the B61 sensor connection to ensure it is securely connected and examine the sensor body for physical damage or wear.

2. 2

   Check the wiring harness leading to the sensor (specifically lead 6075) for any signs of chafing, damage, disconnection, or wear.

3. 3

   Test the B61 sensor's functionality using a multimeter or diagnostic tool to ensure it is providing accurate readings.

4. 4

   Ensure that the TCU/PTA control unit software is up-to-date, as updates may include improvements in sensor signal processing.

1. 1

   Locate the Sensor

   Locate the B61 Transmission Input Speed Sending Unit on the transmission housing.

2. 2

   Disconnect

   Carefully disconnect the electrical wiring harness from the B61 sensor.

3. 3

   Remove

   Unthread or unbolt the faulty sensor from the transmission housing. Have a catch pan ready, as a small amount of transmission fluid may weep from the port.

4. 4

   Install

   Install the new B61 sensor into the housing. Torque to OEM specifications (refer to your specific model's manual, as torque specs vary by transmission type).

5. 5

   Reconnect

   Reconnect the electrical wiring harness, ensuring the connector clicks into place securely.

6. 6

   Clear and Test

   Clear the 000161.02 fault code from the PTA/TCU module using a diagnostic tool. Operate the machine to verify that the transmission input speed reads correctly and the code does not return.