DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 52 (Engine Control System (A25A-FXS) - Diagnostic Codes (P0128-P0171)) >> SFI System >> DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature); DTC P0128-07: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Mechanical Failure [10/2022 - 11/2023] >> Typical Malfunction Thresholds

Typical Malfunction Thresholds

WARNING: This page is about a different variant/trim than selected.
JUDGMENT BY SIMULATED ENGINE COOLANT TEMPERATURE

Duration that both of the following conditions are met 5 seconds or more
Estimated engine coolant temperature 75°C (167°F) or higher
Engine coolant temperature sensor output Less than 75°C (167°F)
JUDGMENT BY ENGINE COOLANT TEMPERATURE AND NO. 2 ENGINE COOLANT TEMPERATURE CHANGES

Engine coolant temperature change speed Less than -0.4°C/sec (31°F/sec), or higher than 0.15°C/sec (32.27°F/sec)
Engine coolant temperature Less than 75°C (167°F)
Grade of engine coolant temperature - No. 2 engine coolant temperature Higher than -0.1°C/sec (-0.18°F/sec), and less than 0.1°C/sec (0.18°F/sec)
Absolute engine coolant temperature - No. 2 engine coolant temperature Less than 6.6°C (11.8°F)