Conditions For Setting DTC

The PCM may detect a temperature difference between the ECT and the IAT of more than 36°F (20°C). If this happens, the vehicle must be driven for 5 minutes over 15 MPH. If the IAT decreases more than 12.6°F (7.0°C), a block heater is indicated and the test is aborted. If the IAT temperature does not decrease, a block heater was not detected and this DTC will set; or at the start up, the temperature difference between the ECT and the IAT is more than 252°F (140°C) and the cranking time for the engine without starting the engine is more than 10 seconds.