Code 46: Power Steering Pressure Switch: Notes

PCM supplies and monitors a 12-volt signal on power steering pressure switch circuit. Pressure switch is normally closed, pulling 12-volt signal low. When power steering pressure exceeds 450 psi (kg/cm² ), switch opens. Code 46 will set when vehicle speed is greater than 40 MPH and monitored circuit voltage is high (open) for more than 25 seconds.

1. Tests for normal operation of power steering switch. Scan testers will display this information differently. Refer to manufacturer operating manual for additional information.
2. If display does not change to normal (no pressure) when switch connector is removed, check for power steering switch signal circuit shorted to ground. If circuit is not shorted, PCM is faulty. If display changes to normal when switch connector is disconnected, switch is defective.
3. Determines if fault is switch or circuit. A jumpered connector should cause high pressure to be displayed, indicating wiring and PCM are okay. If high pressure is indicated and Code 46 is present, switch or switch connector is faulty.