ECT/IAT Auto Idle Stop Conditions

Auto idle stop is disabled by the PCM when the engine coolant and the outside air temperatures are in the range shown below. The thresholds vary, depending on whether ECON ON or ECON OFF is selected.

• ECON ON: The PCM determines a minimum coolant temperature, based on the outside air temperature.
• ECON OFF: The PCM determines a minimum coolant temperature and a minimum/maximum outside air temperature.
• Cooling System Monitoring: Auto idle stop is disabled while the PCM monitors the cooling system for failures. Monitoring occurs during cold engine warm up.

Fig 1: ECT/IAT Auto Idle Stop Conditions Graph (Effective Control)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: ECT/IAT Auto Idle Stop Conditions Graph (Non-Effective Control)

Courtesy of AMERICAN HONDA MOTOR CO., INC.