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Home >> Saturn >> 1999 >> SC2 L4-1.9L DOHC VIN 7 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Description and Operation >> Variable Orifice Power Steering Control
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Variable Orifice Power Steering Control

DESCRIPTION
On the DOHC engine the PCM controls pressure to the power steering system by energizing and de-energizing the Electrical Variable Orifice (EVO) solenoid by supplying power to the solenoid.

The MIL (SERVICE ENGINE SOON telltale lamp) informs the operator that there is a possible problem with the engine or transaxle control systems.

OPERATION
The PCM will supply battery voltage and a ground for the EVO solenoid. The PCM controls both the high side (voltage input) and low side (ground control) to the solenoid so that current control is retained in the presence of any output fault condition.

For more information on the variable orifice power steering system, refer to Steering And Suspension.

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