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GS 430
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Engine Control System (3UZ-FE)
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SFI System
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DTC P0128 Thermostat Malfunction
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Typical Malfunction Thresholds
Typical Malfunction Thresholds
TYPICAL MALFUNCTION THRESHOLDS
Duration that both of following conditions (a) and (b) met
5 seconds or more
(a) Estimated ECT
75°C (167°F) or higher
(b) ECT sensor voltage
Lower than 75°C (167°F)