Conditions For Setting DTC

The PCM may detect a temperature difference between the ECT and the IAT of more than 180°F (100°C).

The time spent cranking the engine, within starting is more than 5 seconds with a temperature difference between the ECT sensor and the IAT sensor of more than 27°F (15°C).

The PCM detects a temperature difference between the ECT sensor of more than 27°F (15°C), then the vehicle must be driven for 5 minutes over 15 MPH. If the IAT sensor temperature decreases more than 12.6°F (7°C) then a block heater is detected and the test is aborted. If the IAT sensor temperature does not decrease, then a block heater was not detected and DTC P0116 sets.