Yale 1079-31 – Vehicle System Manager (VSM) or Engine Control Module (ECM) / Main Controller: 5VE1 & 5VE2 Simultaneously OORH

The 5-Volt reference supply circuits ('E1' and 'E2') that power the machine's sensors are receiving higher voltage than expected. This indicates that the 5-Volt E1 supply, E2 supply, or both are shorted to the system supply source (battery voltage), or a functional failure has occurred within the controller.

• Yale and Hyster Forklifts
• Hyster and Yale forklifts manufactured from 2005 and newer
• Yale Veracitor VX series (GC-VX, GLC-VX, GLP-VX, GDP-VX)
• Hyster Fortis FT series (H40FT, S50FT)

1. 1

   Inspect the electronic throttle body and linkage for dirt, corrosion, or mechanical binding.

2. 2

   Verify that the 5VE1 and 5VE2 sensors (Throttle Position Sensors) are properly aligned and operating correctly.

3. 3

   Visually inspect the main wiring harness and connectors for damage, corrosion, or loose connections.

4. 4

   Use a multimeter to check for short circuits between the 5V sensor signal wires and the battery voltage/system supply.

5. 5

   Test the controller's input circuitry if the wiring harness and sensors test normal.

1. 1

   Clean and Lubricate

   If the throttle assembly is physically stuck or binding, clean the throttle body and lubricate the mechanical linkage.

2. 2

   Repair Wiring

   If your multimeter testing reveals an open circuit or a short to the battery voltage on the 5V reference wires, repair or replace the damaged section of the wiring harness.

3. 3

   Replace Sensors

   If the wiring is intact but the sensors are internally shorted or misaligned beyond adjustment, replace the Throttle Position Sensor.

4. 4

   Replace the Controller

   If all hardware, sensors, and wiring are confirmed to be in good working order, the controller module has suffered a functional failure and must be replaced. Note: Replacement VSMs are shipped un-programmed and must be flashed using dedicated PC software to match the truck's specific serial number.

5. 5

   Clear Codes

   After repairs are made, reset the error codes and monitor the sensor data live to verify the fix.