Description & Operation
A power steering pressure switch is used to improve the vehicles idle quality. The pressure switch improves vehicle idle quality by causing a readjustment of the engine idle speed as necessary when increased fluid pressure is sensed in the power steering system. The power steering pressure switch is mounted directly to the power steering gear.
The pressure switch functions by signaling the powertrain control module that an increase in pressure of the power steering system is putting additional load on the engine. This type of condition exists when the front tires of the vehicle are turned while the vehicle is stationary and the engine is at idle speed. When the powertrain control module receives the signal from the power steering pressure switch, it directs the engine to increase its idle speed. This increase in engine idle speed compensates for the additional load, thus maintaining the required engine idle speed and idle quality.
Removal & Installation
- Disconnect negative battery cable from the negative post of the battery. Be sure cable is isolated from negative post on battery.
- Raise the vehicle.
- Locate the power steering fluid pressure switch on the backside of the power steering gear.
- Remove the vehicle wiring harness connector from the power steering fluid pressure switch.
- Using a 7/8 in. deep-well socket unscrew and remove the power steering fluid pressure switch from the power steering gear.
- By hand, screw the power steering pressure switch into the power steering gear until it is fully seated.
- Using a 7/8 in. deep-well socket, tighten the power steering pressure switch to a maximum torque of 8 Nm (70 inch lbs.) Over-torquing will result in stripping the threads out of the power steering pressure switch port in the steering gear.
- Install the vehicle wiring harness connector. Be sure the latch on the wiring harness connector is fully engaged with the locking tab on the power steering pressure switch.
- Lower the vehicle.
- Fill the power steering fluid reservoir to the correct fluid level. Use only Mopar Power Steering Fluid, or approved equivalent.
- Connect the negative cable to the negative post of the battery.
Start the engine and turn the steering wheel several times stop-to-stop to bleed any air from the fluid in the power steering system. Stop the engine, check the fluid level, and inspect the system for leaks.