STOP AND START  STOP AND START SYSTEM  Starter Inrush Current Reduction Relay Circuit  

The starter inrush current reduction relay prevents the battery voltage from becoming dropping excessively while the starter assembly is operating. If the battery voltage drops below the threshold, stop and start control will be prohibited. In order to prevent this, the engine stop and start ECU operates the starter inrush current reduction relay for approximately 0.1 seconds after the ST NO. 1 relay is activated. By allowing current to flow to the starter inrush current reduction relay, the current that flows to the starter motor is reduced, preventing the battery voltage from dropping excessively.

3.573,0.781 3.917,1.01 0.344,0.229 10 false B 0.063,0.042 1.698,0.333 1.635,0.292 10 false Starter Assembly 1.417,0.135 3.813,0.354 2.396,0.219 10 false Starter Inrush Current Reduction Relay 5.646,0.792 5.958,0.99 0.313,0.198 10 false 30 5.656,1.115 5.969,1.313 0.313,0.198 10 false 50 3.563,1.552 3.719,1.75 0.156,0.198 10 false S 1.51,0.781 1.667,0.979 0.156,0.198 10 false M 4.438,0.146 5.51,0.344 1.073,0.198 10 false Starter Switch 2.156,1.406 2.646,1.823 0.49,0.417 10 false Driving Circuit 2.865,0.719 4.094,0.917 1.229,0.198 10 false Resistor 4.177,0.771 4.333,0.969 0.156,0.198 10 false M

HINT:

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Starter inrush current reduction relay stuck on:

When the engine is started by stop and start control, a large amount of current will flow to the starter assembly, the battery voltage will drop excessively and stop and start control will be canceled.

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Starter inrush current reduction relay stuck off:

Operating current will always flow through the starter inrush current reduction relay and the cranking speed will be low.

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For wire harness and connector inspection procedures and precautions, refer to "General>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>ELECTRONIC CIRCUIT INSPECTION PROCEDURE202111,999999,_V1,_111779,_0504974,RM100000001ZKRP,"