LIMITED i-stop FUNCTION OPERATION TIME [PYUL]: Outline

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LIMITED I-STOP FUNCTION OPERATION TIME (PYUL) DESCRIPTION AND POSSIBLE CAUSE

Description	Frequency of which i-stop function operates is low. Frequent occurrence of engine restarting other than for driving vehicle from stop.
Possible cause	NOTE: To vehicle system reliability, restart the engine regardless of the vehicle condition after 120 s have elapsed since the i-stop function operated. DTCs are stored in the following modules. PCM TCM Electronically controlled brake unit/DSC HU/CM Dash-electrical supply unit Body control module (BCM) Battery voltage low during i-stop function operation Battery deterioration Insufficient battery recharge while engine is running Low recharge effect Generator malfunction (part, system, control malfunction) Large amount of vehicle power consumption High electrical load from aftermarket electrical accessories False detection of engine starting conditions False detection of battery voltage False detection of low power brake unit load Power brake unit vacuum sensor malfunction Malfunction in wiring harness (including connector/terminal) between electronically controlled brake unit/DSC HU/CM and power brake unit vacuum sensor Power brake unit malfunction (air tightness malfunction) Malfunction in vacuum hose to power brake unit (damage, bad check valve) False recognition of driver performing engine start operation False detection of released brake pedal Brake fluid pressure sensor (built into electronically controlled brake unit/DSC HU/CM) malfunction False detection of steering wheel operation Steering angle sensor initialization malfunction EPS control module malfunction Steering angle sensor malfunction
Courtesy of MAZDA MOTORS CORP.
1	Electronically controlled brake unit/DSC HU/CM
2	Power brake unit vacuum sensor