toyota Workshop Repair Guides

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Variable Valve Timing Actuator Position Sensor > < Oil Pressure Sender|Locations
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Oil Pressure Sender: Testing and Inspection

INSPECT ENGINE OIL PRESSURE SWITCH ASSEMBLY 

a. Disconnect the connector from the oil pressure switch assembly.
b. With the switch still installed, measure the resistance between the terminal of the engine oil pressure switch and engine ground.

Standard Resistance:
Engine stopped: Below 1 Ohm 
Engine idling: 10 kOhms or higher

HINT:  If the value is not as specified, replace the engine oil pressure switch

Variable Valve Timing Actuator Position Sensor > < Oil Pressure Sender|Locations