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Home >> Lexus >> 2009 >> IS 250 RWD, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Control System (DTCS P0010 - P0368) >> SFI System >> DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) >> Typical Enabling Conditions

Typical Enabling Conditions

Monitor will run whenever this DTC is not present P0010, P0020 (OCV bank 1, 2)
P0011, P0021 (VVT system bank 1, 2 - advance)
P0012, P0022 (VVT system bank 1, 2 - retard)
P0013, P0023 (Exhaust OCV 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 (A/F sensor heater)
P0100, P0102, P0103 (MAF meter)
P0110, P0112, P0113 (IAT sensor)
P0115, P0117, P0118 (ECT sensor)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (TP sensor)
P0171, P0172, P0174, P0175 (Fuel system)
P0301, P0302, P0303, P0304, P0305, P0306 (Misfire)
P0335 (CKP sensor)
P0340, P0342, P0343, P0345, P0347, P0348 (VVT sensor)
P0351, P0352, P0353, P0354, P0355, P0356 (Igniter)
P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT sensor)
P0500 (Vehicle speed sensor)
P2195, P2196, P2197, P2198 (A/F sensor - rationality)
P2237, P2240 (A/F sensor - open)
P2238, P2241, P2252, P2255 (A/F sensor - low impedance)
P2239, P2242, P2253, P2256 (A/F sensor - high impedance)
P2A00, P2A03 (A/F sensor - slow response)
Battery voltage 11 V or more
Either of the following conditions 1 or 2 is met: -
1. All of the following conditions are met: (a), (b) and (c)
  • (a) ECT at engine start - IAT at engine start
-15 to 7°C (-27 to 12.6°F)
  • (b) ECT at engine start
-10 to 56°C (14 to 133°F)
  • (c) IAT at engine start
-10 to 56°C (14 to 133°F)
2. All of the following conditions are met: (d), (e) and (f)
  • (d) ECT at engine start - IAT at engine start
More than 7°C (12.6°F)
  • (e) ECT at engine start
56°C (133°F) or less
  • (f) IAT at engine start
-10°C (14°F) or more
Accumulated time that vehicle speed is 80 mph (128 km/h) or more Less than 20 seconds