Power Steering Pressure Switch Check

Required Special Tools: 

• MB990662: Power Steering Oil Pressure Gauge
• MB991548: Oil Pressure Gauge Adapter A (Pump Side)
• MB991549: Oil Pressure Gauge Adapter B (Hose Side)

1. Disconnect the pressure hose from the oil pump, and then connect the special tools MB991548, MB990662 and MB991549.
2. Bleed 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. Start the engine and idle it at 1, 000 ± 100 r/min.
4. Disconnect the connector for the oil pressure switch, and place an ohmmeter at the switch.
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 within the standard value.

   Standard value: 1.8 - 2.4 MPa (261 - 348 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 within the standard value.

   Standard value: 1.0 MPa (145 psi) or less 

7. Remove special tools MB991548, MB990662 and MB991549, connect the pressure hose to the oil pump, and then tighten the eye bolt to the specified torque.

   Tightening torque: 57 ± 7 N.m (42 ± 5 ft-lb) 

8. Bleed the system. (Refer to POWER STEERING SYSTEM AIR BLEEDING ).

Fig 1: Checking Power Steering Pressure Switch

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.