C0511

DTC C0511

Test 1-12:

Test 13:

Circuit Description
The electro-hydraulic power steering (EHPS) system uses the Phase A and Phase B signal inputs from the steering wheel sensor for proper operation. The steering wheel sensor outputs Phase A and Phase B signals to the EHPS system that are 90 degrees out of phase to provide quadrature pulsed data corresponding to steering shaft rotational displacement and direction. The signal is resolved to within 1 mechanical degree of resolution. The EHPS system monitors the steering wheel rate information from the steering wheel sensor every 5 milliseconds (200 Hz) for proper operation.

Conditions for Running the DTC
^ EHPS module in RUN mode.
^ Ignition switch in ACC or ON position.
^ Battery voltage between 12-58 volts.

Conditions for Setting the DTC
Steering wheel sensor rate information calculated from the sensor is greater than 2,200 degrees per second (sensor phase A jitter).

Action Taken When the DTC Sets
^ System operation is reduced.
^ The SERVICE STEER SYSTEM message will be displayed.
^ Ramp the motor speed input to the commanded flow resolved from a default steering wheel rate.
^ Stores a DTC C0511 in the powertrain control module (PCM).
^ History DTC C0511 will be set in PCM.

Conditions for Clearing the DTC
^ Steering wheel rate information calculated from the sensor is greater than 2,200 degrees.
^ Using the scan tool.
^ A history DTC will clear after 255 consecutive ignition cycles if the condition for the malfunction is no longer present.

Diagnostic Aids
Ignition cycling is not necessary for reallowing EHPS system to operate normally.

It may be necessary to check Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. Test for the proper operation of phase A circuit.
5. Test for the proper operation of the phase B circuit.