Nissan 49761-V5400 Switch-PRESSRE

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This is a normally open type of switch mounted in the pressure line of the steering gear and the power steering pump. It turns off whenever the steering system pressure gets to some high-pressure setpoint the PCM uses to control idle speed when parking. When parking the car or when the car is stationary for some time but the engine speed is high, then it would be important to check on the operation of the power steering pressure switch. This can be achieved by unplugging the switch connector and with the aid of an ohmmeter, the continuity of the switch connector can be measured by bridging across the steering wheel with the switch connector plugged. The switch should open if the front wheels are aligned in strait line when closed, they should close when the wheel is near the extreme stop position. If the switch is not able to undertake these tests successfully, then it should be changed. If the switch is okay, check the engine idle control operation and inspect the wiring harness for problems. In order to remove the switch trim the electrical connector and undo the switch from the junction block with the help of a back up wrench. Replace the switch and connect it, also, evacuate the power steering system and fill with the fluid if necessary.

The power steering pressure (PSP) switch is a normally open switch located in the pressure line between the steering gear and the power steering pump. It closes when the steering system pressure reaches a high-pressure setpoint, sending a signal to the PCM to maintain engine idle speed during parking maneuvers. The Electronic Engine Control (EEC) system can detect issues with the switch and set trouble codes for specific faults. To check the operation of the PSP switch, disconnect its connector and connect an ohmmeter to the terminals on the switch body. Start the engine and let it idle, then turn the steering wheel to point the front wheels straight ahead; the ohmmeter should indicate an open circuit. As the steering wheel is turned to either side, the PSP switch should close near the steering stop, showing continuity close to zero ohms. If the switch fails either test, it should be replaced. For replacement, disconnect the electrical connector from the switch, drain the fluid from the high-pressure line using a suitable drain pan, and unscrew the switch from the high-pressure line using a back-up wrench. Finally, install and connect the new switch, bleed air from the power steering system, and add fluid as necessary.

The PSP switch is a normally open switch, mounted in the pressure line between the steering gear and the power steering pump. When steering system pressure reaches a high-pressure setpoint, the power steering pressure switch closes and sends a signal to the PCM that the PCM uses to maintain engine idle speed during parking maneuvers. The PCM can detect switch problems and set trouble codes to indicate specific faults. Check the operation of the power steering pressure switch if the engine stalls during parking or if the engine idles continuously at high rpm. Performing the following test will set a diagnostic trouble code and illuminate the Check Engine light. Be prepared to clear the diagnostic trouble code after performing the tests and making the necessary repairs. Disconnect the power steering pressure switch connector and connect an ohmmeter to the terminals on the switch body. Start the engine and let it idle. Make sure the meter leads, loose clothing, long hair, etc. are away from the moving parts of the engine before starting the engine. Turn the steering wheel to point the front wheels straight ahead and read the ohmmeter. It should indicate an open circuit. Turn the steering wheel to either side and watch the ohmmeter. The power steering pressure switch should close as the wheel nears the steering stop on either side, and the meter should indicate continuity of close to zero ohms. If the switch fails either test, replace it. If the switch is OK, troubleshoot the engine idle control operation if high idle speed or stalling problems continue. Also check the wiring harness for an open circuit to the PCM or a damaged harness and check for continuity to ground on the black wire of the harness connector. Disconnect the electrical connector from the switch. Using a back-up wrench on the hex fitting, unscrew the switch from the junction block. Install and connect the new switch. Bleed air from the power steering system. Add fluid as required.

If the power steering pressure switch is functioning properly, you should troubleshoot the engine idle control operation and check the wiring harness for any issues.