Yale 522711-4 – VSM (Vehicle System Manager) or Engine ECU / GCU: Throttle B Position Sensor OORL (Out of Range Low)

The signal voltage from the Throttle B Position Sensor has dropped below the acceptable minimum threshold. This is typically caused by a sensor signal open circuit, sensor supply open circuit, sensor signal shorted to frame ground, sensor signal shorted to sensor ground, internal sensor failure, or a functional failure in the controller.

• Yale and Hyster Forklifts
• Yale VX Series (e.g., GDP030-155VX, GLP030-155VX, GLC020-155VX, GLP050LX)
• Hyster FT Series (e.g., H30-155FT, S30-155FT)

1. 1

   Power Cycle: Turn the forklift power OFF for no less than 30 seconds, then turn it back ON to see if the code clears.

2. 2

   Visual Inspection: Inspect all connectors and the wiring harness associated with the Throttle Position Sensor (TPS) / Accelerator Pedal. Look for damaged wires, loose pins, or corrosion.

3. 3

   Circuit Testing: Use a multimeter to test the sensor supply and signal circuits. Check for an open circuit in the sensor signal or supply wires, and check for a short to the frame ground or sensor ground.

4. 4

   Controller Input Test: Test the controller sensor input circuits to ensure the VSM/ECU is properly receiving and processing the voltage signal.

1. 1

   Disconnect battery

   Disconnect the battery to ensure safety while working on the electrical system.

2. 2

   Locate sensor

   Locate the Throttle Position Sensor / Accelerator Pedal assembly.

3. 3

   Repair wiring

   Disconnect the sensor harness and repair any damaged wiring, open circuits, or shorts to ground found during the diagnostic phase.

4. 4

   Test machine

   Reconnect the harness and test the machine. If the wiring is intact but the code persists, the sensor has failed internally.

5. 5

   Replace sensor

   Remove the defective Throttle Position Sensor and install the replacement part.

6. 6

   Verify repair

   Reconnect the battery, turn the machine on, and verify that the fault code has cleared and the throttle responds correctly.

7. 7

   Replace or reflash controller

   If replacing the sensor and repairing the wiring does not resolve the issue, the controller (VSM/ECU) has a functional failure and must be replaced or reflashed by a dealer.