OPERATING CONDITION
For safety, battery protection, comfort and ECM learning reasons, the engine stop and start ECU prohibits stop and start system operation if any one of the following conditions is met.
| Prohibition Reason | Condition |
|---|---|
| Safety | If the engine is started with the hood open, such as when jump starting, engine restart operation cannot be ensured. Therefore, stop and start system operation will be prohibited. Operation of the system will be restored for the next trip. |
| If the driver door or hood is opened before the engine stops, stop and start system operation will be prohibited for safety reasons. | |
| The brake booster vacuum is insufficient. | |
| The driver seat belt is unfastened before the engine stops. | |
| The engine catalyst is being quickly warmed up. | |
| Battery Protection | If the electrical load is high and the engine is stopped for a long period of time, stop and start system operation will be prohibited. |
| The refresh charge continues for 0.5 to 1 hour, and is carried out approximately every 30 hours of driving. While refresh charge, stop and start system operation will be disabled. | |
| When the idle stop rate becomes higher than the predetermined rate, stop and start system operation will be disabled. | |
| When the battery voltage becomes low and the battery integrated current value drops to below the threshold value, stop and start operation will be disabled. | |
| Comfort | If the air conditioning is on when the outside temperature is high and the evaporator temperature is high, stop and start system operation will be prohibited.*1 |
| If the air conditioning is on when the outside temperature is low, the stop and start system operation will be prohibited for a certain period after engine start.*1 | |
| If the heater is on when the outside temperature is low and the engine coolant temperature is low, stop and start system operation will be prohibited. | |
| If the front DEF switch and blower switch are on, stop and start system operation will be prohibited. | |
| If the outside temperature is below -5°C (23°F), stop and start system operation will be prohibited. | |
| ECU Learning | ECU learning is not complete.*2 |
| Operability | While the steering wheel is turning (a rotation speed of 45° per second or more), the stop and start system is prohibited to operate. |
*1: Models with air conditioning system
Tech Tips
*2: If the value learned by the ECU has been cleared by disconnecting the battery or for another reason, stop and start system operation will be prohibited until ECU learning is completed.