PROCEDURE
(a) Check that conditions in the cabin are not likely to cause condensation. HINT: This problem occurs when the cabin is humid and the temperature changes rapidly. This may produce condensation, resulting in a short circuit. OK: Condensation is not likely to be produced.
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Toyota Tundra Service Manual > Sfi System: Thermostat (P0128)
DESCRIPTION This DTC is stored when the Engine Coolant Temperature (ECT) does not reach 75°C (167°F) despite sufficient engine warm-up time having elapsed. DTC No. DTC Detection Condition Trouble Area P0128 Conditions (a), (b) and (c) met for 5 seconds (2 trip detection logic): (a) Cold start (b) ...
