Limited I-Stop Function Operation Time: Notes

LIMITED I-STOP FUNCTION OPERATION TIME (SKYACTIV-G VIN Y) DESCRIPTION AND POSSIBLE CAUSE

Troubleshooting item	Limited i-stop function operation time
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 ensure electric 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 DSC HU/Control Module Dash-electrical supply unit Body control module (BCM) SAS control module EPS control module Instrument cluster 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 Short or open circuit in power brake unit vacuum sensor power supply circuit, signal circuit, and ground circuit 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 DSC HU/Control Module) 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.

Troubleshooting item

Limited i-stop function operation time

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 ensure electric 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
- DSC HU/Control Module
- Dash-electrical supply unit
- Body control module (BCM)
- SAS control module
- EPS control module
- Instrument cluster

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
- Short or open circuit in power brake unit vacuum sensor power supply circuit, signal circuit, and ground circuit
- 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 DSC HU/Control Module) 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.