Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1984CAVALIER L4-121 2.0L VIN P TBIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSPOWER STEERING PRESSURE SWITCHTESTING AND INSPECTION
1984 Chevrolet Cavalier L4-121 2.0L VIN P TBI
Power Steering Pressure Switch: Testing and Inspection
1984 Chevrolet Cavalier L4-121 2.0L VIN P TBISECTION Testing and Inspection
Fig. 045 Chart C-1E Power Steering Pressure Signal:
Fig. 046 - Wiring Diagram for Chart C-1E Power Steering Pressure Signal. VIN P:
CHART C-1E, P/S PRESSURE SWITCH
The power steering pressure switch is normally closed to ground, and circuit 901 will measure less than 1 volt.
Turning the steering wheel increases power steering oil pressure and its load on an idling engine, however the pressure switch will open before the load can cause an idle problem.
Opening the switch causes circuit 901 to read near battery voltage and the ECM will increase the idle air rate to maintain idle speed.
a. A pressure switch that will not open or with CKT 901 shorted to ground may cause the A pressure switch that will not open or with CKT 901 shorted to ground may cause the engine to stop when power steering loads are high.
b. A switch that will not close or an open CKT 450 or 901 will cause a higher than normal idle.
1. Checks for ECM signal voltage on CKT 901 and confirms that ground CKT 450 is OK.
2. Less than 1 ohm indicates that the switch is OK and closed.
3. Maximum resistance or infinity indicates an open switch when power steering pressure is high. Switch is OK.
RENDER: 1.0x
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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.