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HOMESERVICE MANUALSCHEVROLET1988CAVALIER VL, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSIS2.0L VIN [1] TBI CEC TESTS W/CODESCHART C-1E: POWER STEERING SWITCH
1988 Chevrolet Cavalier VL, Standard

Chart C-1E: Power Steering Switch

1988 Chevrolet Cavalier VL, StandardSECTION Chart C-1E: Power Steering Switch

The power steering pressure switch is normally open to ground, and circuit No. 495 (No. 901 terminal D13 on early L Body) will be near battery voltage. Turning the steering wheel increases power steering oil pressure and its load on an idling engine. The pressure switch will close before the load can cause an idle problem. Closing the switch causes circuit No. 495 (No. 901 terminal D13 on early L Body) to read less than one volt and the ECM will increase the idle air rate and de-energize the A/C relay.

  • A pressure switch that will not close, or an open in circuits No. 495 (No. 901 terminal D13 on early L Body) or 450, may cause the engine to stop when power steering loads are high.
  • A switch that will not open, or a circuit No. 495 (No. 901 terminal D13 on early L Body) shorted to ground, may affect idle quality, and will cause the A/C relay to be de- energized.
NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Different makes of "Scan" testers may display the state of this switch in different ways. Refer to "Scan" tester to determine how this input is indicated.
  2. Checks to determine if circuit No. 495 (No. 901 terminal D13 on early L Body) is shorted to ground.
  3. This should simulate a closed switch.
Fig 1: Chart C-1E: Power Steering Switch Flow Chart
G7040
RENDER: 1.0x

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