Case IH 2160 (519174.03) - DEC – Transmission Control Unit (TCU): Synchro 6-8 Position Sensor - short to high voltage

The control module has detected a 'short to high voltage' on the circuit for the Synchro 6-8 Position Sensor. This typically means the sensor's signal wire is shorted directly to the 5-volt reference wire or to battery voltage, or that the sensor has failed internally. This can result in the transmission failing to engage the synchro, leading to a loss of drive in gears 6 through 8.

• MAXXUM T4E
• Magnum series (180, 210, 225, 235, 250, 340)
• Maxxum series (100-140)
• Puma series (115-210)
• Steiger series

1. 1

   Inspect the sensor, linkage, and wiring harness where it routes to the top of the front/speed transmission for rubbed wires, corrosion, or contamination.

2. 2

   Back-probe the sensor connector with a multimeter to verify it is receiving the correct 5V reference voltage and has a solid ground.

3. 3

   Perform a wiggle test on the wiring harness and connectors while observing live diagnostic data on the tractor's monitor to check for intermittent voltage spikes.

4. 4

   Verify that the sensor is not physically bound up where it passes through the transmission case, as this can prevent the synchro from engaging properly.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to prevent electrical shorts during the repair.

2. 2

   Locate the Sensor

   Locate the Synchro 6-8 position sensor, which is typically mounted on top of the front/speed transmission housing.

3. 3

   Disconnect

   Unplug the electrical harness connector from the sensor.

4. 4

   Remove

   Unbolt and carefully remove the position sensor from the transmission case. Inspect the port for debris or mechanical binding.

5. 5

   Install

   Insert the new position sensor and secure it to the transmission housing.

6. 6

   Reconnect

   Plug the wiring harness back into the new sensor.

7. 7

   Clear Codes

   Reconnect the battery. Use the tractor's H-menus or the Electronic Service Tool (EST) to clear the stored 2160 fault code.

8. 8

   Calibrate

   Perform a transmission/synchronizer calibration procedure if required by the control module to learn the new sensor's physical end-stops.