Lexus 89438-33010 Switch, Power Steering Oil Pressure

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The power steering pressure (PSP) switch is located at the high pressure line outlet fitting of the power steering pump. When steering system pressure reaches a high-pressure set point, the PSP switch closes and sends a signal to the PCM that the PCM uses to maintain engine idle speed during parking maneuvers. Check the operation of the PSP switch if the engine stalls during parking or if the engine idles continuously at high rpm. Loosen the right front wheel lug nuts, raise the vehicle and support it securely on jackstands. Remove the right front wheel and the right front fender apron seal. Disconnect the PSP switch connector and connect an ohmmeter to the terminal and the switch body. Start the engine and let it idle. Turn the steering wheel to point the front wheels straight ahead and read the ohmmeter. It should indicate no continuity (infinite resistance). Turn the steering wheel to each side and watch the ohmmeter. The PSP switch should close as the wheel nears the steering stop on each side, and the meter should indicate continuity (zero ohms). If the switch fails either test, replace it. To replace, raise the vehicle and support it securely on jackstands. Disconnect the cable from the negative battery terminal. Disconnect the electrical connector from the switch and unscrew the switch from the fitting on the steering pump. Remove the old O-ring on the switch and install a new O-ring. Install and connect the new switch and lower the vehicle to the ground. Bleed air from the power steering system. Add fluid as required.

The power steering pressure (PSP) switch is located at the high pressure line outlet fitting of the power steering pump. When steering system pressure reaches a high-pressure set-point, the PSP switch closes and sends a signal to the PCM that the PCM uses to maintain engine idle speed during parking maneuvers. Check the operation of the PSP switch if the engine stalls during parking or if the engine idles continuously at high rpm. Disconnect the PSP switch connector and connect an ohmmeter to the terminals on the switch body. Start the engine and let it idle. Turn the steering wheel to point the front wheels straight ahead and read the ohmmeter. It should indicate no continuity (infinite resistance). Turn the steering wheel to either side and watch the ohmmeter. The PSP switch should close as the wheel nears the steering stop on either side, and the meter should indicate continuity (zero ohms). If the switch fails either test, replace it. Raise the vehicle and support it securely on jackstands. Disconnect the cable from the negative battery terminal. If the stereo in your vehicle is equipped with an anti-theft system, make sure you have the correct activation code before disconnecting the battery. Disconnect the electrical connector from the switch and unscrew the switch from the fitting on the steering gear. Install and connect the new switch and lower the vehicle to the ground. Bleed air from the power steering system. Add fluid as required.

Disconnect the cable from the negative battery terminal. Raise the front of the vehicle and support it securely on jackstands. For four-cylinder models, note that the Power Steering Pressure Switch is located on the power steering pump and is screwed directly into the pump. Locate the Power Steering Pressure Switch on the power steering pump and disconnect the switch electrical connector. Place a drain pan under the pump, then unscrew the Power Steering Pressure Switch from the pump, anticipating some power steering fluid leakage. Installation is the reverse of removal. Check the power steering fluid level and add fluid as necessary. For V6 models, the Power Steering Pressure Switch is located at the power steering pump, screwed into the top of the banjo bolt connecting the pressure hose to the pump. Disconnect the electrical connector from the Power Steering Pressure Switch. Place a drain pan under the power steering pump, then unscrew the Power Steering Pressure Switch from the banjo bolt, being prepared for power steering fluid leakage. Installation follows the same pattern as removal. Ensure you check and top up the power steering fluid as needed.

Disconnect the cable from the negative battery terminal. Raise the front of the vehicle and support it securely on jackstands. For four-cylinder models, note that the Power Steering Pressure Switch is located on the power steering pump and is screwed directly into the pump. Locate the Power Steering Pressure Switch on the power steering pump and disconnect the switch electrical connector. Place a drain pan under the pump, then unscrew the Power Steering Pressure Switch from the pump, anticipating some power steering fluid leakage. Installation is the reverse of removal. Check the power steering fluid level and add fluid as necessary. For V6 models, the Power Steering Pressure Switch is located at the power steering pump, screwed into the top of the banjo bolt connecting the pressure hose to the pump. Disconnect the electrical connector from the Power Steering Pressure Switch. Place a drain pan under the power steering pump, then unscrew the Power Steering Pressure Switch from the banjo bolt, being prepared for power steering fluid leakage. Installation follows the same pattern as removal. Ensure you check and top up the power steering fluid as needed.