This is a very common error code and is easily misdiagnosed, Although, most of the time it is a sensor fault, there are times that the wiring going to the steer axle has been damaged. Occasionally the steering just needs to be recalibrated and this can be done through the overhead display.
Below is a diagram of the steer sensor and the VSM (Vehicle System Manager). This is a quick test to see if the voltage supply wiring is intact. You can unplug the sensor and test for voltage and negative (ground) with the key in the on position. There should be just under 5 volts.
If the reference voltage is not present, test both the positive and negative separately. Use a direct battery negative or a direct battery positive. If both are present, there is still a possibility that the signal wire is damaged or not making a good connection at the VSM or the sensor, so you should check the pins on each end of the wiring. More likely than not if the positive and negative wires are good, the signal wire is good too. At this point. Replace the sensor.
The most common place for damage that I have experienced is in from of the steer tires where the wiring has dropped down against the tire and were rubbed through damaging the harness.
Calibrating the Steer Wheel & Axle Positions
On the overhead display, press the right arrow twice and input the service code. If you do not have a code, you must contact the local dealer and request it be reset to 55555, this is the factory set code for all Hyster and Yale lift trucks.
Enter the service and then scroll right until you see the screwdriver. Press the enter button and continue to the steer wheel or the steer axle symbols and perform the calibration one at a time. This will either clear the code or show an X on the symbol that means the calibration did not work. If the calibration worked, cycle the key and return to service, If the calibration did not work (shows the X) look for another issue such as a bad connection or broken wire. Then repeat this process.
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