Examination
1. The PSP switch is included in the hydraulic line of the power steering system in the area between the steering pump and the rack and pinion housing. When turning the steering wheel hard (e.g. when parking or making sharp turns) the pressure in the hydraulic booster system increases noticeably and the PSP sensor-switch, closing, informs the PCM module about this, which accordingly raises the idle speed, compensating for the increasing load on the engine. If the sensor-switch malfunctions, the OBD self-diagnosis system enters the corresponding fault code into the processor memory.
2. If the engine stalls when making maneuvers while parking the car, check the PSP sensor-switch for proper functioning. A faulty sensor-switch can also lead to a constant over-idling of the engine.
3. Identification of the terminals of the PSP sensor-switch connector can be made according to the wiring diagrams.
4. Disconnect the electrical wiring from the sensor-switch and connect an ohmmeter to the terminals on the sensor housing.
5. Run the engine to idle.
6. Bring the front wheels of the car into a straight line and read the ohmmeter reading, which in this case should be equal to infinity.
7. Turning the steering wheel in any direction, observe the meter readings. When approaching the steering wheel to any of the extreme positions, the PSP sensor-switch should close, which is confirmed by the zero reading of the ohmmeter.
8. At negative results of check replace the gauge switch. If the sensor-switch is OK, you should check the engine idle settings.
Replacement
1. Jack up the car and put it on stands.
2. Disconnect the negative cable from the battery.
Attention! The negative wire should always be disconnected first and connected last. If the stereo system installed in the car is equipped with a security code, before disconnecting the battery, make sure that you have the correct combination to activate the equipment!
3. Disconnect the electrical wiring from the sensor-switch and unscrew the latter from its union connection.
4. Replace the failed sensor-switch with a replacement one and lower the car to the ground.
5. Remove air plugs from the hydraulic path of the power steering system (see chapter Suspension and steering). Correct the hydraulic fluid level if necessary (see chapter Settings and ongoing maintenance).