Outside air temperature and engine coolant temperature

The outside air and engine coolant temperatures affecting auto idle stop vary, depending on the A/C system mode and if ECON mode is on or off. When both the outside air and the engine coolant temperatures are within the idle stop enable area, the ECM/PCM allows auto idle stop. When the temperatures are within the idle stop disable area, the ECM/PCM prevents auto idle stop.

Fig 1: Outside Air And Engine Coolant Temperature Output Graph

Courtesy of AMERICAN HONDA MOTOR CO., INC.