Power Steering Pressure Switch: Testing and Inspection

INSPECTION




Using Scan Tool




Checking Fluid Pressure




HARNESS INSPECTION
STEP 1. Check for an open or short-circuit between the power steering pressure switch and the engine control module.
- Power steering pressure switch connector: Disconnected
- Engine control module connector: Disconnected
OK: GO TO STEP 2
NG: Repair the harness. (A1 - 37)




STEP 2. Measure the applied voltage.
- Power steering pressure switch connector: Disconnected
- Engine control module connector: Connected
- Ignition switch: ON
Voltage (V): Battery positive voltage
OK: STOP
NG: Replace the engine control module.





POWER STEERING PRESSURE SWITCH CHECK
1. Disconnect the pressure hose from the oil pump, and then connect the special tools.
2. Bleed the air, and then turn the steering wheel several times while the vehicle is not moving so that the temperature of the fluid rises to approximately 50 - 60° C (122 - 140° F).
3. The engine should be idling.
4. Disconnect the connection of the connector for the pressure switch, and place an ohmmeter in position.
5. Gradually close the shut-off valve of the pressure gauge and increase the hydraulic pressure then check whether or not the hydraulic pressure that activates the switch is the standard value.

Standard value: 1.47 - 1.96 MPa (213 - 284 psi)

6. Gradually open the shut-off valve and reduce the hydraulic pressure; then check whether or not the hydraulic pressure that deactivates the switch is the standard value.

Standard value: 0.69 - 1.18 MPa (100 - 171 psi)

7. Remove the special tools, and then tighten the pressure hose to the specified torque.
8. Bleed the system.