System Description
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL CHART
| Input/Output | Transmits/Receives component | Signal name | Description | |
|---|---|---|---|---|
| Input | Accelerator pedal position sensor | Accelerator pedal position sensor signal | Detects an accelerator pedal position. | |
| Brake pedal position switch signal | Detects the brake pedal is depressed. | |||
| Crankshaft position sensor signal | Detects an engine speed. | |||
| Engine coolant temperature sensor signal | Detects an engine coolant temperature. | |||
| Atmospheric pressure sensor signal | Detects an atmospheric pressure. | |||
| Transmission malfunction signal | Detects Transmission is malfunction. | |||
| Battery discharging current | Receives battery discharging current, battery current and battery temperature. | |||
| Battery current | ||||
| Start/Stop OFF switch (ON/OFF) | Receives an operational state of the start/stop OFF switch (ON/OFF). | |||
| Driver assistance buzzer signal | Receives vehicle detection condition of detection zone. | |||
| IPDM E/R | CAN communication | Start/Stop permit signal | Detects the transmission is ready to operate the idle start/stop system. | |
| Hood switch signal | Detects engine hood status. | |||
| BCM | CAN communication | Ignition switch status signal | Detects ignition switch status. | |
| Stop lamp switch signal | Detects an accelerator pedal position. | |||
| Door switch signal | Detects the status of driver side door. | |||
| I-key exist information signal | Detects the i-key exist | |||
| ABS actuator and electric unit (control unit) | CAN communication | Vehicle speed signal | Detects vehicle speed. | |
| Brake fluid pressure sensor signal | Detects brake fluid pressure. | |||
| Brake booster pressure sensor signal | Detects a pressure in brake booster. | |||
| ABS operation signal | Detects ABS operation. | |||
| VDC operation signal | Detects VDC operation. | |||
| Brake hold readiness signal | Detects the brake hold readiness status judged by the ABS actuator and electric unit (control unit). | |||
| G sensor signal | Detects vehicle angularity. | |||
| A/C auto amp. | CAN communication | Start/Stop permit signal | Detects the air conditioning system is ready to operate the idle start/stop system. | |
| Combination meter | CAN communication | Seat belt buckle switch signal | Detects driver is sitting on the driver seat. | |
| TCM | CAN communication | Start/Stop permit signal | Detects the transmission is ready to operate the idle start/stop system. | |
| Shift position signal | Detects the transmission is ready to operate the idle start/stop system. | |||
| Tow mode switch | Detects Tow mode switch status. | |||
| Input | DC/DC converter | LIN communication | Operation status signal | Detects an operational state of DC/DC converter. |
| Diagnosis signal | Detects DC/DC converter malfunction. | |||
| Output | BCM | CAN communication | Start/Stop status signal | Transmits a start/stop status signal |
| ABS actuator and electric unit (control unit) | CAN communication | Start/Stop status signal | Transmits a start/stop status signal | |
| Brake hold request signal | Transmits the brake hold/release request according to the idle start/stop system. | |||
| A/C auto amp. | CAN communication | Start/Stop status signal | Transmits a start/stop status signal | |
| TCM | CAN communication | Start/Stop status signal | Transmits a start/stop status signal | |
| Combination meter | CAN communication | Start/Stop status signal | Transmits a start/stop status signal | |
| Start/Stop indicator lamp request signal | Transmits request signal which turn ON the start/stop indicator lamp. | |||
| DC/DC converter | LIN communication | DC/DC converter operation check signal | Checks DC/DC converter operation status. | |
| DC/DC voltage request signal | Controls the DC/DC output voltage. | |||
| Around view monitor control unit | CAN communication | Start/Stop status signal | Transmits a start/stop status signal | |
| Cranking enable signal | Transmits a cranking enable signal to activates the starter motor control relay. | |||
SYSTEM DESCRIPTION
The idle start/stop system enables the engine to automatically stop/restart with a simple operation and reduces unnecessary idling during stoplight or traffic congestion to improve fuel economy, reduce exhaust gas, and minimize noise. ECM detects a vehicle condition, engine condition and driver's operation condition based on signals sent from each unit and the sensors to comprehensively control the idle start/stop system. The operation condition of the idle start/stop system is indicated by the start/stop indicator lamp on the combination meter and showing on the information display (dot matrix information display). (Refer to Warning lamps/Indicator lamps.) If a malfunction is detected in the idle start/stop system, the system control is automatically deactivated and the malfunction is alerted to the driver by blinking the start/stop indicator lamp and showing the status on the information display (dot matrix information display). When a driver's operation is judged as dangerous one during the idle start/stop system operation, the start/stop indicator lamp blinks at a high speed and the status is shown on the information display (with dot matrix information display). The buzzer mounted on the combination meter sounds simultaneously to warn the driver of the dangerous operation. ECM detects a vehicle condition, engine condition and driver's operation condition based on signals sent from each unit and the sensors to comprehensively control the idle start/stop system. The operation condition of the idle start/stop system is indicated by the start/stop indicator lamp on the combination meter and showing on the information display (dot matrix information display). (Refer to Warning lamps/Indicator lamps ). If a malfunction is detected in the idle start/stop system, the system control is automatically deactivated and the malfunction is alerted to the driver by blinking the start/stop indicator lamp and showing the status on the information display (dot matrix information display). When a driver's operation is judged as dangerous one during the idle start/stop system operation, the start/stop indicator lamp blinks at a high speed and the status is shown on the information display (with dot matrix information display). The buzzer mounted on the combination meter sounds simultaneously to warn the driver of the dangerous operation.
SYSTEM CONTROL CONDITION DISPLAY
Start/Stop indicator lamp status
| System condition | Condition | Start/Stop indicator lamp | Warning chime |
|---|---|---|---|
| Operate | Normal | Illuminate | - |
| Hood open * | High speed blinking | Sound | |
| Normal operation: Idle start/stop system inhibited state | System conditions excluded failure are not satisfied. (Battery state of charge, A/C steering operation, driver's seat belt is unbuckled etc.) | Illuminate | - |
*: Engine is stalled after alert for 1.5 seconds.
BASIC OPERATION
FUNCTION DESCRIPTION
When the idle start/stop system readiness conditions are satisfied while the vehicle is moving, the system is ready. When the idle start/stop system operation conditions are satisfied while the vehicle is in a stop condition, the engine is stopped. During idle start/stop system operation, stopping time, the amount of fuel saved by the idle start/stop system is indicated on the combination meter. When the engine restart conditions are satisfied, ECM activates the engine restart relay to restart the engine. And the DC/DC converter boosts the voltage during cranking to protect the electrical equipment from low voltage. After restarting the engine, the start/stop indicator lamp and the indication on the information display turn OFF.
Start/Stop Readiness Condition
ECM judges idle start/stop system is ready when the following conditions are satisfied.
| Item | Condition | ||
|---|---|---|---|
| Vehicle | Start/Stop OFF switch | OFF (Switch indicator: OFF) | |
| Start/Stop indicator Lamp | Not blink (No malfunction) | ||
| Door (driver side) | Close | ||
| Seat belt (driver side) | Fastened | ||
| Driving history | Drive the vehicle at 6 km/h (3.7 MPH) or more after start the engine with ignition switch | ||
| Drive the vehicle at 8 km/h (5 MPH) or more after restart
NOTE:
|
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| Passes 5 seconds or more after restart | |||
| Hood | Close | ||
| Air conditioning | Automatic air conditioning | Not in DEF mode | |
| Receives start/stop permit signal | |||
| Manual air conditioning | Not in DEF mode | ||
| ABS | System is normal | ||
| ABS not activated *2 | |||
| Receives start/stop permit signal | |||
| Battery status | Not poor battery performance. | ||
| Elevation | 2, 500 m (8, 203 ft) | ||
| Intelligent parking assist | OFF | ||
| Engine | Gear Position | D position | |
| I-key | I-key exists inside vehicle | ||
| ST RLY operation status | Relay operates correctly | ||
| Starter motor | No starter motor long continuous operation | ||
| Delivery mode | Not in delivery mode *2 | ||
| Brake booster pressure | Presence of sufficient negative pressure to a brake force. (Refer to System Description.) System Description ). | ||
| Stand Still Activation | Receives start/stop permit signal. | ||
| Drive mode switch | Not in Tow mode. | ||
| MIL (Malfunction indicator lamp) | Not illuminate (No malfunction) | ||
| Engine coolant temperature | 40 - 100 °C (104 -212 °F) | ||
*1: Depends on the vehicle conditions.
*2: If ABS system is activated, drive the vehicle at 12 km/h (7.5 MPH) or more after stop the vehicle.
- The idle start/stop system may be cancelled when the battery is weak or if a battery other than the idle start/stop system specific battery is used.
- Even though the vehicle is in above conditions, the idle start/stop system may be cancelled automatically.
Start/Stop Operation Condition
When the following conditions are satisfied, ECM stops the engine. And the combination meter turns ON a start/stop indicator lamp.
| Item | Condition | |
|---|---|---|
| Vehicle | Vehicle speed | Vehicle stopped [0 km/h (0 MPH) ] |
| Steering wheel | Not steer (steering force does not occur) | |
| Brake pedal | Depressed | |
| Brake fluid pressure | 0.8 MPa (8 bar, 8.16 kg/cm2, 160 psi) | |
| Brake booster pressure | Presence of sufficient negative pressure to a brake force | |
| Vehicle angularity | Approx. 14% or less | |
| Engine | Engine speed | Around idle speed (Approx. 1, 130 RPM or less) |
| Engine system | Permit start/stop operation | |
| Transmission | Selector lever position | D |
| Transmission system | Receives start/stop permit signal | |
Restart Condition
When any of the following conditions is satisfied during idle start/stop system operating condition, ECM restarts the engine. And the combination meter turns OFF the start/stop indicator lamp.
| Item | Condition | |
|---|---|---|
| Start/Stop OFF switch | ON (Switch indicator ON) | |
| Vehicle | Steering wheel | Steered (steering force occurs) |
| Door (driver side) | Open | |
| Seat belt | Released | |
| I-key | I-key doesn't exist inside vehicle | |
| Air conditioning | Automatic air conditioning | DEF switch is pressed. |
| Air conditioning system cannot keep the performance. | ||
| Manual air conditioning | Select DEF mode and fan is ON | |
| Brake | Brake booster pressure | Insufficient negative pressure for braking force |
| Brake pedal | Released | |
| Accelerator pedal | Depressed | |
| Engine | Engine coolant temperature | less than 40°C (104°F), over than 100°C (212°F) |
| Engine system | Inhibit start/stop operation | |
| Trans mission | Shift lever position | Except for D position |
| Battery | Poor battery performance | |
| ABS | Receives start/stop operation | |
| Intelligent Parking Assist | ||
| Emergency brake | ||
| Drive mode switch | Selected the TOW mode | |
Engine stalled Condition
When any of the following conditions is satisfied during idle start/stop system operating condition, ECM stalls the engine.
| Item | Condition | |
|---|---|---|
| Vehicle | Hood | Open |
- The engine may restart automatically if required by the Idling Stop System.
- Place the Ignition switch in the "OFF" position before opening the hood or performing any maintenance. Failure to do so may result in serious injuries due to automatic engine restart.
- Always place the Ignition switch in the "OFF" position before leaving your vehicle, as the system may have turned the engine off, but the Ignition will still be on and automatic restart may occur.
VOLTAGE STABILIZER FUNCTION
ECM transmits a voltage stabilizer signal to the DC/DC converter during cranking at an engine restart. The DC/DC converter temporarily increases the voltage to prevent the electric equipment from reset due to low voltage. The adoption of the DC/DC converter enables a stable power supply to the electric equipment connected to the DC/DC converter and permits a substantial lowering of the voltage. For the electrical equipment connected to the DC/DC converter, see "SYSTEM DIAGRAM".
ENGINE RESTART BYPASS RELAY CONTROL
ECM controls the engine restart bypass control relay and activates the engine restart bypass relay. When the restart conditions are satisfied, ECM turns ON the engine restart bypass control relay instantaneously right after the restart and opens the engine restart bypass relay. This allows a current to pass the inner resistance circuit right after the starter motor is activated. When the starter motor is rotating, the voltage is directly supplied to the starter motor without being passed through the inner resistance circuit in the engine restart bypass relay because the engine restart bypass relay is closed. In this way, ECM enables the battery voltage stabilization and reduces the battery deterioration rate by decreasing the battery voltage drop resulted from cranking at an engine restart.