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Home >> Lexus >> 2021 >> RC F Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (2 Of 9) >> SFI System >> DTC P0128: Thermostat [03/2019 - ] >> Typical Enabling Conditions

Typical Enabling Conditions

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Monitor runs whenever the following DTCs are not stored P0010, P0020, P1023, P1360, P1361, P1362, P1363, P1364, P1365, P1366, P1367, P2614 (Motor drive VVT system control module bank 1, 2)
P0011, P0021 (VVT system bank 1, 2 - advance)
P0012, P0022 (VVT system bank 1, 2 - retard)
P0013, P0023 (Exhaust camshaft timing oil control valve 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)
P0102, P0103 (Mass air flow meter)
P0112, P0113 (Intake air temperature sensor)
P0115, P0117, P0118 (Engine coolant temperature sensor)
P0120, P0121, P0122, P0123, P0220, 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 (Air fuel ratio sensor)
P0171, P0172, P0174, P0175 (Fuel system)
P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 (Misfire)
P0335 (Crankshaft position sensor)
P0340, P0342, P0343, P0345, P0347, P0348 (VVT sensor)
P0351, P0352, P0353, P0354, P0355, P0356, P0357, P0358 (Igniter)
P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT sensor)
P0500 (Vehicle speed sensor)
P11EA, P11EB, P11EC, P11ED, P11EE, P11EF, P11F0, P11F1, P11F2, P11F3, P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2, P21A3 (Air-fuel ratio imbalance)
P1340 (Camshaft position sensor)
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 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 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 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 at engine start -10°C (14°F) or higher
Accumulated time that vehicle speed is 128 km/h (80 mph) or more Less than 20 seconds
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 0 to 4500 rpm
Vehicle speed 65 to 128 km/h (40.625 to 80 mph)