Conditions for Setting the DTC
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The ECM detects that the maximum amount of cumulative airflow has been attained, and the minimum ECT of 70°C (158°F) has not been met with a start-up IAT colder than 10°C (50°F).
OR
The ECM detects that the maximum amount of cumulative airflow has been attained, and the minimum ECT of 80°C (176°F) has not been met with a start-up IAT warmer than 10°C (50°F).