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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (2GR-FKS) - Diagnostic Codes (2 Of 6) >> 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 [12/2019 - 10/2022] >> Typical Enabling Conditions

Typical Enabling Conditions

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Monitor runs whenever the following DTCs are not stored P0010, P0020 (VVT oil control solenoid bank 1, 2)
P0011, P0021 (VVT system bank 1, 2 - advance)
P0012, P0022 (VVT system bank 1, 2 - retard)
P0013, P0023 (Exhaust VVT oil control solenoid bank 1, 2)
P0014, P0024 (Exhaust VVT system bank 1, 2 - advance)
P0015, P0025 (Exhaust VVT system bank 1, 2 - retard)
P0016, P0018 (VVT system bank 1, 2 - misalignment)
P0017, P0019 (Exhaust VVT system bank 1, 2 - misalignment)
P0031, P0032, P0051, P0052, P101D, P103D (Air fuel ratio sensor heater)
P0087, P0088, P0191, P0192, P0193 (Fuel pressure sensor (for high pressure side))
P0101, P0102, P0103 (Mass air flow meter)
P0111, P0112, P0113 (Intake air temperature sensor)
P0116, P0117, P0118 (Engine coolant temperature sensor)
P011B (Engine coolant temperature/intake air temperature sensor correlation)
P0121, P0122, P0123, P0222, P0223, P2135 (Throttle position sensor)
P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D, P2195, P2196, P2197, P2198, P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255, P2256, P2A00, P2A03 (Air fuel ratio sensor)
P0171, P0172, P0174, P0175 (Fuel system)
P0201, P0202, P0203, P0204, P0205, P0206, P062D, P21CF, P21D0, P21D1, P21D2, P21D3, P21D4 (Fuel injector)
P0300 - P0306 (Misfire)
P0335, P0337, P0338 (Crankshaft position sensor)
P0340, P0342, P0343, P0345, P0347, P0348 (Camshaft position sensor)
P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust camshaft position sensor)
P0500 (Vehicle speed sensor)
P107B, P107C, P107D (Fuel pressure sensor (for low pressure side))
P11EA, P11EB, P11EC, P11ED, P11EE, P11EF, P11F0, P11F1, P219A, P219B P219C, P219D, P219E, P219F, P21A0, P21A1 (Air-fuel ratio imbalance)
P1235 (High pressure fuel pump circuit)
P0128: JUDGMENT BY SIMULATED ENGINE COOLANT TEMPERATURE

Battery voltage 11 V or higher
Either of the following conditions is met 1 or 2
1. All of the following conditions are met (a), (b) and (c)
(a) Engine coolant temperature at engine start - Intake air temperature (for mass air flow meter sub-assembly) at engine start -15 to 7°C (-27 to 12.6°F)
(b) Engine coolant temperature at engine start -10 to 56°C (14 to 133°F)
(c) Intake air temperature (for mass air flow meter sub-assembly) at engine start -10 to 56°C (14 to 133°F)
2. All of the following conditions are met (d), (e) and (f)
(d) Engine coolant temperature at engine start - Intake air temperature (for mass air flow meter sub-assembly) at engine start Higher than 7°C (12.6°F)
(e) Engine coolant temperature at engine start 56°C (133°F) or less
(f) Intake air temperature (for mass air flow meter sub-assembly) at engine start -10°C (14°F) or higher
Accumulated time at vehicle speed of 128 km/h (80 mph) or more Less than 20 seconds
P0128: JUDGMENT BY ENGINE COOLANT TEMPERATURE CHANGE AT HIGH VEHICLE SPEED

During that all of the following conditions are met 15 seconds or more
Battery voltage 11 V or higher
Engine coolant temperature at engine start -10°C (14°F) or higher
Intake air temperature at engine start -10°C (14°F) or higher
Engine speed Less than 4500 rpm
Vehicle speed 65 to 128 km/h (40.625 to 80 mph)
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