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Home >> Lexus >> 2007 >> LX 470 >> Repair and Diagnosis >> Engine Performance >> Engine Control System (2UZ-FE) >> SFI System >> DTC P0128 Thermostat Malfunction >> Typical Enabling Conditions
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Typical Enabling Conditions

TYPICAL ENABLING CONDITIONS

Monitor will run whenever these DTCs are not present P0010, P0020 (OCV Bank 1, 2)
P0011 (VVT System 1 - Advance)
P0012 (VVT System 1 - Retard)
P0021 (VVT System 2 - Advance)
P0022 (VVT System 2 - Retard)
P0031, P0032, P0051, P0052 (A/F sensor heater - Sensor 1)
P0100 - P0103 (MAF meter)
P0110 - P0113 (IAT sensor)
P0115 - P0118 (ECT sensor)
P0125 (Insufficient ECT for closed loop)
P0171, P0172 (Fuel system)
P0300 - P0308 (Misfire)
P0335 (CKP sensor)
P0340 - P0346 (VVT sensor)
P0351 - P0358 (igniter)
P0500 (VSS)
P2196, P2198 (A/F sensor - rationality)
P2237, P2240 (A/F sensor - open)
P2A00, P2A03 (A/F sensor - slow response)
Battery voltage 11 V or higher
One of the following conditions 1 or 2 is met -
1. All of the following conditions (a), (b) and (c) are met -
(a) ECT at engine start - IAT at engine start -15 to 7°C (5 to 12.6°F)
(b) ECT at engine start -10 to 56°C (14 to 132.8°F)
(c) IAT at engine start -10 to 56°C (14 to 132.8°F)
2. All of the following conditions (a), (b) and (c) are met -
(a) ECT at engine start - IAT at engine start Higher than 7°C (12.6°F)
(b) ECT at engine start 56°C (133°F) or lower
(c) IAT 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