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Home >> Toyota >> 2015 >> Prius Three >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0010-P0171)) (Except Plug-In) >> SFI System >> DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) [08/2014 - ] >> Typical Enabling Conditions

Typical Enabling Conditions

Monitor runs whenever following DTCs not stored P0010 (Camshaft timing oil control valve assembly)
P0011 (VVT system - advance)
P0012 (VVT system - retard)
P0016 (VVT system - misalignment)
P0031, P0032, P101D (Air fuel ratio sensor heater)
P0102, P0103 (Mass air flow meter)
P0107, P0108 (Manifold absolute pressure)
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, P015A, P015B, P2195, P2196, P2237, P2238, P2239, P2252, P2253 (Air fuel ratio sensor)
P0171, P0172 (Fuel system)
P0300, P0301, P0302, P0303, P0304 (Misfire)
P0335 (Crankshaft position sensor)
P0340, P0342, P0343 (Camshaft position sensor)
P0351, P0352, P0353, P0354 (Igniter)
P0401 (EGR system (closed))
P219A, P219C, P219D, P219E, P219F (Air fuel ratio imbalance)
Auxiliary battery voltage 11 V or higher
Either of the following conditions 1 or 2 is met: -
1. All of 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: (a), (b) and (c)
(a) Engine coolant temperature at engine start - Intake air temperature at engine start Higher than 7°C (12.6°F)
(b) Engine coolant temperature at engine start 56°C (133°F) or less
(c) Intake air temperature at engine start -10°C (14°F) or higher
Accumulated time at 128 km/h (80 mph) or more Less than 20 seconds