INSPECTION PROCEDURE 1. INSPECT UNLOCK WARNING SWITCH ASSEMBLY 
(a) Measure the resistance according to the value(s) in the table below. Standard resistance:
If the result is not as specified, replace the unlock warning switch assembly. Text in Illustration
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Toyota Tundra Service Manual > Sfi System: Power Steering Pressure Sensor Circuit (P0550,P0552,P0553)
DESCRIPTION The power steering oil pressure sensor is turned ON when a power steering wheel load occurs by turning the steering wheel. The ECM regulates the engine idling RPM according to the voltage output of the sensor. DTC No. DTC Detection Condition Trouble Area P0550 Power steering oil pressure ...
