Code 46, Power Steering Pressure Switch: Notes

The power steering pressure switch is normally open. Turning the steering wheel increases pressure and closes the switch, pulling voltage on the switch circuit low. Code 46 will set when power steering circuit voltage is low (indicating high pressure) and vehicle speed is greater than 40 MPH. Both of these conditions must be met for more than 15-25 seconds.

1. Tests for normal operation of power steering switch. "Scan" testers will display this information differently. Refer to the manufacturer's 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, ECM is faulty. If display does change 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 ECM are okay. If high pressure is indicated and Code 46 is present, switch or switch connector is faulty.