Case IH 18011 – Armrest: Powershift Throttle Voltage Too High

The Armrest control module is receiving a voltage signal from the Powershift hand throttle potentiometer that exceeds the maximum expected threshold. In a typical 5-volt reference sensor circuit, this condition usually points to a short to power on the signal wire, an open ground circuit, or an internal failure of the potentiometer itself.

• Magnum
• Steiger T4B
• Puma 165
• Puma 180
• Puma 195
• Puma 210
• Puma 225 CVX

1. 1

   Disassemble the armrest console and visually inspect the wiring harness and connector for pinched wires, corrosion, or loose pins

2. 2

   Check the ground wire at the throttle potentiometer connector using a multimeter (an open ground will cause the signal voltage to pull high)

3. 3

   Test the signal wire for a short to a higher voltage source, such as the 5V reference or 12V power

4. 4

   Monitor live voltage data of the Powershift throttle while moving the lever; if voltage remains stuck high and wiring tests good, the potentiometer has failed internally

1. 1

   Disconnect battery

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

2. 2

   Access throttle assembly

   Remove the covers and panels on the armrest console to expose the internal multi-function handle and throttle assemblies.

3. 3

   Disconnect harness

   Disconnect the electrical harness from the Powershift throttle potentiometer.

4. 4

   Remove faulty potentiometer

   Remove the mounting screws or retaining clips securing the faulty throttle potentiometer to the armrest assembly.

5. 5

   Install new potentiometer

   Install the new Powershift throttle potentiometer and secure it in place.

6. 6

   Reconnect harness

   Reconnect the electrical harness, ensuring the connector clicks and locks securely.

7. 7

   Reassemble console

   Reassemble the armrest console covers.

8. 8

   Restore power

   Reconnect the battery and turn the key on.

9. 9

   Clear codes

   Clear the inactive fault codes from the system.

10. 10

    Calibrate throttle

    Perform a throttle calibration procedure via the tractor's display monitor so the Armrest controller can learn the minimum and maximum voltage sweep of the new sensor.