Important: A learning procedure must be performed after clearing Diagnostic Trouble Codes (DTC) or replacing the Engine Control Module (ECM) to inialise the Stop Start system functionality – see “Stop Start System Learning Procedure”
Important: If the battery is charged with an external power source while the battery is still connected to the vehicle then the battery negative cable should be disconnected for approximately 5 seconds after charging.
The Stop Start system performs the following functions in order to reduce emissions, fuel consumption and idling noise during stops. The system monitors the vehicle condition depending on signals from the relevant sensors and switches.
- Engine auto stop.
- Engine auto start.
The system indicates the status of these controls to the driver by illuminating or flashing the Stop Start indicator light located in the instrument housing.
Engine Auto Stop Control
When all of the following conditions are met, the Stop Start control module sends an engine stop signal to the engine control module (ECM) via the CAN communication line. The ECM then stops the engine.
- The battery is sufficiently charged.
- The battery temperature is 5 to 55 °C.
- The vehicle speed is below 3 km/h.
- The vehicle speed was above 6 km/h after starting off.
- The engine coolant temperature is 57 to 105 °C.
- The vacuum in the brake servo is higher than the specified level.
- Neutral gear is selected.
- Clutch pedal is released.
- Accelerator pedal is released.
- The Stop Start switch is in the OFF position.
- The bonnet is closed.
- The driver side front door is closed and the driver side front seat belt is fastened.
- The ECM has detected no diagnostic trouble code (DTC) related to the Stop Start system.
- The ESP control module has detected no DTC related to the Stop Start system.
- The ABS is not in operation.
- No DTC is detected concerning the DC/DC converter.
- The Stop Start control module has detected no DTC.
When the engine auto stop control is activated, a Stop Start indicator light signal is sent to the instrument housing via the CAN communication line. The Stop Start indicator light then illuminates.
Engine Auto Start Control
When the gear is in neutral and one or more of the following conditions are met, the Stop Start control module sends a signal to the ECM via the CAN communication line to start the engine. This turns on the ST2 relay, which enables the starter motor to operate and the engine to be restarted.
- Clutch pedal is depressed. (*1).
- At least 2 minutes have passed since automatic stop of the engine. (*2).
- The vehicle speed is 4 km/h or higher. (*2).
- Battery discharge is more than the specified level. (*2).
- The vacuum in the brake servo is lower than the specified level. (*2).
- The Stop Start control module has detected specific DTC(s). (Engine starting under the fail-safe mode) (*2).
When the engine auto start control is activated, a Stop Start indicator light signal is sent to the instrument housing via the CAN communication line.
Note. *1. The Stop Start indicator light then goes out.
Note. *2. The Stop Start indicator light then flashes for 2 seconds and then goes out.
Engine Auto Start Inhibit Control
If any of the following conditions are met during the engine auto stop control, the Stop Start control module suspends the engine auto start control.
- The Stop Start control module has detected specific DTC(s). (Engine starting under the fail-safe mode).
- The bonnet is open.
- The driver side front door is open and the driver side front seat belt is unfastened.
Note. Once the engine auto start control is inhibited, driver operation is required to restart the engine.
Description of Stop Start System Components
| Component | Description |
|---|---|
| Stop Start control module | This module is located at the lower centre part of the instrument panel. The module communicates with the ECM, ESP control module, HVAC control module (auto A/C model), instrument housing, etc. via the CAN communication line. The module performs the Stop Start controls according to signals from the relevant sensors and switches. |
| DC/DC converter | The DC/DC converter is located within the instrument panel on the passenger side. The converter stabilizes the electric power to the combination meter and audio unit when the engine auto start control is activated. |
| Brake servo pressure sensor | This sensor is installed on the brake servo. The sensor provides the Stop Start control module with data on the brake servo vacuum. |
| Clutch pedal position switch 1 Clutch pedal position switch 2 | These switches are installed on the clutch pedal bracket. The switches provide the Stop Start control module with information on the position of the clutch pedal. |
| Transmission neutral switch | This sensor is installed on the transmission case. The Stop Start control module determines whether the gear is in neutral based on the signal from this sensor. |
| Intelligent battery sensor | This sensor is installed on the battery negative lead. The sensor provides information on the temperature around the battery and battery current to the Stop Start control module. |
| Bonnet lock switch | This switch is installed on the bonnet lock. The Stop Start control module identifies the open/closed state of the bonnet according to the signal from this switch. |
| Stop Start switch | The Stop Start switch is installed to the switch panel in the instrument panel. Setting this switch to the operating position enables the driver to cancel the engine auto stop control. When the ENG Stop Start switch is in the depressed position, the indicator light inside the switch is illuminated. |
| Stop Start indicator light | This indicator light is located in the instrument housing. The light is illuminated during the engine auto stop control. This light flashes for 2 seconds when the engine auto start control is activated (clutch pedal is released). |
| Stop Start warning light | This warning light is located in the instrument housing. The light is illuminated when there is a fault in the system. |
| Buzzer | This buzzer is located in the instrument housing. The buzzer sounds when any of the conditions for inhibiting the engine auto start control is met |
| ST2 relay | The ST2 relay is in the main relay box. When the Stop Start control module restarts the engine, the module turns on the relay so that electric power is supplied to the starter motor. |
Description of Stop Start System Alarm Function
The Stop Start alarm function works when the Stop Start control module detects any of the following conditions. This function provides a warning by sounding the buzzer inside the instrument housing according to the condition detected.
| Component | Condition | Warning buzzer |
|---|---|---|
| Gear shift alarm | The gearshift lever is moved to a position other than Neutral without depressing the clutch pedal. | Sounds 2 times. |
| Driver side front seat belt unfastened and driver side front door open alarm. | The driver side front seat belt is not fastened. The driver side front door is open. | Sounds 5 times. |
| Bonnet open alarm | The bonnet is open. | Sounds 2 times. |
| Stop Start system malfunction alarm | A fault related to the engine auto start control occurs in the Stop Start system. | Sounds 2 times. |