Conditions For Setting DTC

If the PCM detects a temperature difference between the ECT sensor and the IAT sensor of more than 27°F (15°C), the vehicle must be driven for 7 minutes over 15 MPH. If the IAT sensor temperature decreases more than 5.4°F (3°C), a block heater is detected and the test is aborted. If the IAT sensor temperature does not decrease, a block heater was not detected and DTC P0116 sets; or the temperature difference between the ECT and the IAT at start-up is more than 252°F (140°C) and the time spent cranking the engine, without starting is more than 10 seconds.