C0495 - With Real Time Dampening (RTD)

Circuit Description
The suspension control module supplies a Pulse Width Modulated (PWM) voltage to the Electronic Variable Orifice (EVO) solenoid as well as a low reference path. The PWM voltage is used to control the current into the solenoid which controls the size of the output orifice of the power steering pump. This results in an increase or decrease in steering wheel turning effort. The suspension control module is constantly adjusting the PWM voltage and monitoring the current flow to achieve the desired PWM. The system uses inputs from VSS and the steering wheel position/speed sensor for the desired PWM output. This provides the vehicle speed related steering assist.


Conditions for Running the DTC
Vehicle speed greater than 8 km/h (5 mph). EVO solenoid command greater than 5% PWM duty cycle.


Conditions for Setting the DTC
- EVO output PWM less than 10% duty cycle and EVO output current greater than 260 mA. or
- EVO output PWM greater than 94% duty cycle and EVO output current less than or equal to 360 mA.


Action Taken When the DTC Sets
- DTC C0495 will be stored in memory.
- The suspension control module will turn off both EVO solenoid outputs for the remainder of the ignition cycle.


Conditions for Clearing the MIL/DTC
- A history DTC will clear after not seeing the malfunction for 100 consecutive ignition cycles.
- Using a scan tool to clear the DTC.


Diagnostic Aids

Important: If DTC C0496 and/or DTC C0501 are present, perform the diagnosis for these DTC's before proceeding.

- Check connectors at the EVO solenoid, Suspension Control Module and all in-line connectors for proper seating and that terminals are clean and tight.
- A EVO solenoid that is out of resistance range may cause this DTC to set. Normal resistance of the EVO solenoid is from 11 to 13 ohms.
- Low vehicle speed = high level of assist.
- High vehicle speed = low level of assist.
- EVO is controlled by the suspension control module with the Z55 RPO option only. Vehicles without the Z55 option, EVO is controlled by the Body Control Module (BCM).


Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
3. Tests whether the condition is module, system, or condition related.
4. Tests whether the EVO solenoid and circuits.
5. Test the EVO circuits.
7. Clear DTCs and check if the DTC resets.