Town Car V8-4.6L VIN W (1997)
Variable Assist Control Valve: Description and Operation
The power steering control valve actuator is located on the power steering pump below the engine on the LH side.
The power steering control valve actuator generates a differential pressure, dependent on flow and current input.
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This differential pressure is used to control the spool valve in the CIII power steering pump.
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The power steering control valve actuator/spool valve regulates the hydraulic flow and when combined with a current controlling device, yields a
variable assist power steering pump.
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In the event of an electrical circuit malfunction such as circuit open, shorted, or control module failure, the actuator will provide full power
steering assist.
