Examination
1. The power steering hydraulic pressure switch is located on the hydraulic pump. When the pressure in the hydraulic system reaches a preset value, the sensor closes the contacts and sends a signal to the ECU. The control unit uses this information to maintain engine speed when maneuvering the vehicle in tight spaces. A sensor malfunction is detected by the diagnostic system and the corresponding code appears in the system memory (see paragraph 2).
2. The need to check the pressure sensor in the hydraulic steering system occurs when the engine stalls when parked or the idle speed is too high.
3. Specify the purpose of the connector pins according to the electrical diagrams at the end chapter 12.
4. Disconnect the electrical wiring from the sensor and connect an ohmmeter to the sensor contacts.
5. Start the engine and let it idle.
6. Turn the front wheels to the straight ahead position and read the ohmmeter reading. It should show infinity (chain break).
7. Turn the wheels in any direction and watch the ohmmeter. The sensor contacts must close when the steered wheels approach any of the extreme positions. When the contacts are closed, the ohmmeter will show zero.
8. If the sensor behaves differently, replace it.
Replacement
9. If the vehicle has a V-engine, raise the vehicle and support it on jack stands.
10. Disconnect the wiring from the sensor and unscrew the sensor from the pump.
11. Screw in the new sensor and tighten it securely. Connect electrical wiring.
12. Release air from the hydraulic steering system (see chapter 10). Add fluid to the system if necessary (see chapter 1).