46 (1991 Base (LKO) Vehicles) Power Steering Pressure Circuit - Open

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The PCM provides a 12 volts bias on the circuit to the power steering pressure switch (PSPS) which is also connected to ground. The switch is normally closed. When pressure exceeds 31O3 - 4482 kPa (450 - 650 PSIG) , the switch opens. The contacts will remain open until pressure drops below 2413 kPa (350 PSIG) .

Code Parameters

Code 46 will set if:

  • Vehicle has power steering.
  • The PCM indicates an open power steering pressure switch circuit.

Code 46 will set when:

  • Vehicle speed is above 64 KPH (40 MPH).
  • Circuit is open for more than 25 seconds.

Diagnostic Aids

  • When attempting to diagnose an intermittent problem use the Scan Tool to review supplemental diagnostic information. The supplemental data can be used to duplicate a problem. Select MALF History from Scan Tool EC menu.
  • Check the tightness of the female terminal grip with a spare male terminal.