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: Insufficient Coolant Temperature for Closed Loop Fuel Control (P0125)
DESCRIPTION Refer to DTC P0115 (See page ). DTC No. DTC Detection Condition Trouble Area P0125 Engine Coolant Temperature (ECT) does not reach closed-loop enabling temperature for 20 minutes (this period varies with engine start ECT) (2 trip detection logic) ECT sensor Cooling system Water inlet wit ...
