How to check and replace the power steering pressure switch on a Toyota Sienna?

The Power Steering Pressure Switch is located at the high-pressure line outlet fitting of the power steering pump. It closes and sends a signal to the PCM when steering system pressure reaches a high-pressure set point, which the PCM uses to maintain engine idle speed during parking maneuvers. If the engine stalls during parking or idles continuously at high rpm, the PSP switch's operation should be checked. To do so, 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 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. To replace the switch, raise the vehicle and support it securely on jack stands, disconnect the cable from the negative battery terminal, disconnect the electrical connector from the switch, and unscrew the switch from the fitting on the Rack And Pinion. Install and connect the new switch, lower the vehicle to the ground, and bleed air from the power steering system, adding fluid as required.

Genuine Toyota Sienna Power Steering Pressure Switch

Power Steering Oil Pressure Switch

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Toyota Sienna Power Steering Oil Pressure Switch
Part Number: 89438-33010
$48.18 MSRP: $67.35
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Product Specifications
- Other Name: Switch, Power Steering Oil Pressure
- Warranty: This genuine Toyota part is covered by warranty.
Fits the following Vehicles:
- 1998-2010 Toyota Sienna | CE, LE, XLE | 6 Cyl 3.0L, 6 Cyl 3.3L, 6 Cyl 3.5L | 1MZFE, 2GRFE, 3MZFE; GSL20L-PFADKK, GSL20L-PFAEKA, GSL20L-PFAEKK, GSL20L-PFAQKA, GSL20L-PFAQKK, GSL20L-PRADKK, GSL20L-PRAEKA, GSL20L-PRAEKK, GSL20L-PRAQKA, GSL20L-PRAQKK, GSL23L-SBADKA, GSL23L-SBADKK, GSL25L-PFADKK, GSL25L-PFAEKA, GSL25L-PFAEKK, GSL25L-PFAQKA, GSL25L-PFAQKK, MCL10L-GFSDKA, MCL10L-GFSDKK, MCL10L-GFSGKA, MCL10L-GFSGKK, MCL10L-PFSDKA, MCL10L-PFSDKK, MCL10L-PFSGKA, MCL10L-PFSGKK, MCL10L-SESDKA, MCL10L-SESDKK, MCL20L-PFADKK, MCL20L-PFAEKA, MCL20L-PFAEKK, MCL20L-PFAQKA, MCL20L-PFAQKK, MCL20L-PRADKK, MCL20L-PRAEKA, MCL20L-PRAEKK, MCL20L-PRAQKA, MCL20L-PRAQKK, MCL23L-SBADKA, MCL23L-SBADKK, MCL25L-PFADKK, MCL25L-PFAEKA, MCL25L-PFAEKK, MCL25L-PFAQKA, MCL25L-PFAQKK

Toyota Sienna Power Steering Pressure Switch

The Toyota Sienna Power Steering Pressure Switch keeps a check on the hydraulic pressure inside the steering system and sends a signal to the engine control computer when pressure rises sharply. Found on the high-pressure line from the pump, the switch in Sienna applications detects the load created by turning the steering wheel at low speed during parking. The engine control unit will raise idle when the Power Steering Pressure Switch senses maximum pressure and closes a circuit to prevent stalling. The hydraulic pump is protected from overloading and the steering assist is consistent without an increased driver load in this simple electromechanical action. The Power Steering Pressure Switch works with the flow control valve of the pump, which directs the excess fluid back to the pump after reaching a certain limit, thus maintaining the pressure in the system between set limits. The Power Steering Pressure Switch has only this sole and essential function on all referenced Toyota Sienna models, and no different style or variant has been noted for all Toyota Sienna vehicles. That means the Power Steering Pressure Switch is standardized across Toyota steering systems.

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Toyota Sienna Power Steering Pressure Switch Parts Questions & Experts Answers

Power Steering Oil Pressure Switch
89438-33010
Q: How to check and replace the power steering pressure switch on a Toyota Sienna?
A:
The Power Steering Pressure Switch is located at the high-pressure line outlet fitting of the Power Steering Pump. It closes and sends a signal to the PCM when steering system pressure reaches a high-pressure set point, which the PCM uses to maintain engine idle speed during parking maneuvers. If the engine stalls during parking or idles continuously at high rpm, the PSP switch's operation should be checked. To do so, 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 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. To replace the switch, raise the vehicle and support it securely on jack stands, disconnect the cable from the negative battery terminal, disconnect the electrical connector from the switch, and unscrew the switch from the fitting on the Rack And Pinion. Install and connect the new switch, lower the vehicle to the ground, and bleed air from the power steering system, adding fluid as required.