Malfunction determination 1:

The difference between the current engine coolant temperature at the radiator (ECT 2) [ECT Sensor 2] and the initial engine coolant temperature at the radiator (ECT 2) [ECT Sensor 2] is at least 4 deg.F (2 deg.C) when either of these condition is met:

• When the estimated engine coolant temperature [EST ECT1] reached to 162 deg.F (72 deg.C).
• When the estimated engine coolant temperature [EST ECT1] changed 36 deg.F (20 deg.C).