Nilfisk-Advance CS7000 Fuel Cell EcoFlex, Service Manual

Page: 368 / 440

Steering System 368 Service Manual – CS7000
Symptom Troubleshooting (No DTC stored)
Steering Inoperative - Steering Controller Status LED is Blinking Rapidly
Check for steering system codes.
Steering Inoperative - Steering Controller Status LED is Off
Check power and ground supplies to the steering controller.
Steering Inoperative - Steering Controller Status LED is On Steady
Check each input to make sure it is operating correctly. (Refer to the
Specifications
Section,
Shop
measurements
information)
• Steering wheel rotation sensor - Each encoder signal should switch between approximately 5 volts and 0
volts as the steering wheel is turned very slowly.
• Travel limit switches - There should be approximately 0 volts at one or both inputs at the controller.
No “Steering Feel”
Possible Causes:
• Steering wheel rotation sensor (TFD) - Check for open circuit in the TFD coil.
• Steering Controller - Not controlling TFD
– Check the power supply into the TFD
– Check the ground control voltage. It should be around 24 volts.
– Check the current draw of the TFD coil.
◦ Approximately 400 mA = Regular steering feel.
◦ Approximately 900 to 1000 mA = steering feel at “soft stop”.
◦ If the current draw is normal but the steering feel is not, replace the steering wheel rotation sensor.
Steering Wheel Is Difficult To Turn
Unplug the steering wheel rotation sensor. If the steering wheel is still difficult to turn, there is a
mechanical binding in the steering wheel rotation sensor TFD.