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HOMESERVICE MANUALSCHEVROLET1994CORSICA BASE, 2.2 4REPAIR AND DIAGNOSISSTEERINGPOWER STEERINGSTEERING SYSTEM - POWERTESTINGHYDRAULIC SYSTEM PRESSURE CHECK
1994 Chevrolet Corsica Base, 2.2 4

Hydraulic System Pressure Check

1994 Chevrolet Corsica Base, 2.2 4SECTION Hydraulic System Pressure Check
  1. Disconnect high pressure line at rear of power steering pump. Connect Power Steering Analyzer (J-25323-B) between power steering high pressure line and pump fitting. Set parking brake and leave vehicle in Park or Neutral. Open valve on analyzer. Start engine. Allow system to reach operating temperature. Ensure fluid level is correct.
  2. Note power steering pressure and flow at engine idle. DO NOT  move steering wheel while engine is running. Pressure reading should be less than 200 psi (14 kg/cm2 ). If pressure is greater than specified, stop engine and repair restrictions.
  3. Partially close valve until pressure reading is 700 psi (49 kg/cm2 ), and then record flow reading. Subtract this flow reading from step 2) flow reading. If flow drops more than one gallon (3.78L) per minute, replace pump internal ring, rotor and vanes. Check for worn or damaged pressure plate and thrust plates. Replace as necessary.
    CAUTION: Pump will be damaged if valve is held closed for more than 5 seconds.
  4. Completely close valve for a few seconds and then open it. Do this 3 times, recording highest pressure obtained each time valve is closed. If readings are not within 50 psi (3.5 kg.cm2 ) of each other, replace flow control valve. Ensure flow control valve moves freely in bore.
  5. Record flow rate with engine speed at 1500 RPM. Subtract this flow reading from flow reading taken in step 2). If flow rate varies more than one gallon (3.78L) per minute, remove and clean flow control valve. DO NOT  disassemble valve. Ensure valve moves freely.
  6. Turn steering wheel all the way left and right. DO NOT  hold steering wheel at stops for more than 5 seconds. Flow rate should decrease to less than one gallon (3.78L) per minute at 1500 RPM. If flow rate is okay, problem is not in pump. Check steering gear for leakage. Remove analyzer assembly. Fill and bleed hydraulic system. See HYDRAULIC SYSTEM BLEEDING  under LUBRICATION.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.