STOP AND START SYSTEM SYSTEM DESCRIPTION


  1. STOP AND START CONTROL

    The Stop and Start system is controlled according to the following conditions, achieving appropriate engine stop and start control together with safe and smooth driving characteristics.


    1. When the conditions in the following table have been met, the engine can be stopped due to Stop and Start system control.

      Item

      Condition

      (All of the following conditions are met)
      Idle Stop Engine Coolant Temperature 40°C to 105°C (104°F to 221°F)
      Driver Door Closed
      Brake Booster Vacuum Sufficient brake booster vacuum
      Stop and Start Cancel Switch System control has not been prohibited using the stop and start cancel switch
      Vehicle Speed 0 km/h (0 mph)
      Engine Speed 1200 rpm or less
      Hood Closed
      Battery Voltage 7.2 V or more at engine start
      Battery Temperature -15°C to 75°C (5°F to 167°F)
      Battery Integrated Current*

      1. 0 A-sec or more: After engine start by ignition switch operation

      2. After the integrated current value has increased to 0 A-sec or more at least once since ignition switch ON:


        • More than -3110 A-sec: When a low battery temperature condition is not detected (the battery temperature is 11°C (51.8°F) or more).

        • More than -864 A-sec: When a low battery temperature condition is detected (the battery temperature is less than 10°C (50°F)).
      Air Conditioning

      Any of the following conditions is met:


      • Air conditioning is off

      • Only at the first ignition ON, the air conditioning is on when the outside temperature is 25°C (77°F) or less and the evaporator temperature is 15°C (59°F) or less

      • Air conditioning is on when the outside temperature is 3°C (37°F) or higher
      Heater

      Either of the following conditions is met:


      • The heater is off

      • The heater is on when the outside temperature is 8°C to 10°C (46°F to 50°F) or higher and the engine coolant temperature is 55°C to 65°C (131°F to 149°F) or higher

      Tech Tips

      *: Refer to Data List items "Integrated Current" and "Battery Integrated Current" Click here.

    2. When the engine has been stopped due to Stop and Start system control, and any of the following conditions are met, the engine will restart.

      Item

      Condition

      (Any of the following conditions is met)
      Engine Restart Brake Booster Vacuum The brake booster vacuum is insufficient
      Air Conditioning The timer in the A/C amplifier runs out (7 to 34 seconds) when the air conditioning is on
      Heater The blower output temperature drops when the heater is on
      Air Conditioning/Heater

      • The air conditioning switch or blower switch is turned on while the engine is stopped

      • The defogger switch is turned on while the engine is stopped (for automatic air conditioner)
      Battery Battery performance or voltage drops
      Vehicle Speed Vehicle speed signal is input

  2. SYSTEM PROHIBIT CONTROL

    The engine stop and start ECU prohibits Stop and Start system control according to the table below. The prohibition conditions are specified for each system.

    System Prohibition Condition Vehicle State Restoration Condition Prohibition Condition Check Timing
    Engine Engine coolant temperature is less than 40°C (104°F) Engine has not warmed up Engine coolant temperature is 40°C to 105°C (104°F to 221°F) Always
    Idle speed learning has not completed Stop and Start system control is prohibited until idle speed learning completes Idle speed learning has completed Always
    Brake Brake booster vacuum decreases Brake booster vacuum decreases due to pumping the brakes or another reason Normal brake booster vacuum is reached Every time the vehicle stops
    Air conditioning

    Heater:

    All of the following conditions have been met:


    • Blower switch is ON

    • Outside temperature is 8°C to 10°C (46°F to 50°F) or less

    • Coolant temperature is less than 55°C to 65°C (131°F to 149°F)

    		 Heater function is not effective

    • Coolant temperature is 55°C to 65°C (131°F to 149°F) or more

    • Blower switch is turned off

    		 During heater operation

    Cooling function:

    All of the following conditions have been met:


    • Blower switch is ON

    • Air conditioning switch is on

    • Outside temperature is 25°C (77°F) or more

    • Evaporator temperature is 15°C (59°F) or more (Once the temperature drops below 15°C (59°F) after the ignition switch is turned to ON, Stop and Start system control will be restored)

    		 Cooling function is not effective

    Any of the following conditions have been met:


    • Evaporator temperature is 15°C (59°F) or less

    • Blower switch is turned off

    • Air conditioning system is turned off

    		 While air conditioning system (cooling function) is on

    Defogger:


    1. Outside temperature is 3°C (37°F) or less, and air conditioning system switch and blower switch are on

    2. DEF switch is on (only for Automatic Air Conditioning)

    3. A subsequent idle stop operation is prohibited for 40 to 90 seconds after an idle stop is performed with an outside temperature of 3°C to 8°C (37.4°F to 46.4°F)

    		 Windows are easily fogged

    The corresponding condition has been met:


    1. Air conditioning system switch or blower switch is turned off

    2. DEF switch is turned off (for Automatic Air Conditioning)

    3. 40 to 90 seconds have elapsed after engine stopped due to Stop and Start system control or air conditioning system or blower switch is turned off

    		 While air conditioning system (cooling function for defogger) is on
    Door/engine hood Driver door is opened before engine stop and start control Driver door courtesy switch ON signal is input Driver door is closed Always
    Engine hood is opened before Stop and Start system control Engine hood switch OFF signal is input Engine hood is closed Always
    Power source Battery voltage drops below 7.2 V at engine start Battery charge is insufficient or battery has deteriorated

    Battery is charged or replaced

    (Battery voltage is above 7.2 V at engine start)

    		 Every time the engine is started

    Battery temperature is

    -15°C (5°F) or less or 75°C (167°F) or higher

    (At low temperatures: engine restarting is not assured

    At high temperatures: for battery protection)

    		 Depends on outside temperature An appropriate battery temperature is reached Always

    Battery integrated current* value is:


    1. Less than 0 A-sec: After engine start by ignition switch operation

    2. After the integrated current value has increased to 0 A-sec or more at least once since ignition switch ON:


      • -3110 A-sec or less: When a low battery temperature condition is not detected (the battery temperature is 11°C (51.8°F) or more).

      • -864 A-sec or less: When a low battery temperature condition is detected (the battery temperature is less than 10°C (50°F)).

    • Heavy electrical load

    • High stop and start rate (Time that engine stopped due to Stop and Start system control is long)

    Battery integrated current* value is more than a certain level.


    1. 0 A-sec or more: After engine start by ignition switch operation

    2. After the integrated current value has increased to 0 A-sec or more at least once since ignition switch ON:


      • More than -2246 A-sec: When a low battery temperature condition is not detected (the battery temperature is 11°C (51.8°F) or more).

      • More than 0 A-sec: When a low battery temperature condition is detected (the battery temperature is less than 10°C (50°F)).

    		 Always
    During refresh charge A refresh charge of 30 minutes or more is performed after every 20 hours of driving Refresh charge is completed Always
    Engine is started with the engine hood open (for jump starting) - Ignition switch is turned off Every time the engine is started

    Tech Tips


    • *: Refer to Data List items "Integrated Current" and "Battery Integrated Current" Click here.

    • If the ECM learned values have been cleared by disconnecting the battery or for another reason, Stop and Start system control will be prohibited until ECM learning completes.

    • Allow the engine to idle for 3 minutes after the engine warms up and check that the engine speed is within 50 rpm of the target idle speed.

  3. WARNING CONTROL

    If any of the following operations are performed while the engine is stopped due to Stop and Start system control, the system will not restart the engine. The engine will change the mode from "stopped due to system control" to "stalled" or the driver will be warned using the buzzer and indicator lights.

    Operation Warning Control
    Driver door is opened The buzzer sounds and the ECO indicator light blinks
    Hood is opened The engine changes to "stalled"
    Shift lever is operated without depressing the clutch pedal The buzzer sounds and the ECO indicator light blinks

  4. WARNING INDICATOR AND BUZZER OPERATION

    System control status and warnings are shown to the driver by the ECO indicator light, the ECO OFF indicator light and the buzzer.

    ECO Indicator and Buzzer Operation
    Item Condition ECO Indicator Buzzer
    System due to Stop and Start system control operating (engine is stopped) Normal operation Illuminates Does not sound
    The driver door is open Blinks*1 Sounds
    The engine is restarted for battery protection Does not sound
    The engine is restarted for air conditioning control
    The engine is restarted due to a drop in brake booster vacuum
    The shift lever is operated without depressing the clutch pedal Sounds
    Diagnosis Any DTCs are stored Blinks*2 Does not sound
    Starter life span The number of times the starter has been operated exceeds the threshold

    *1: The blinking interval is 0.25 seconds.

    *2: The blinking interval is 0.5 seconds.

  5. ECO OFF INDICATOR

    The ECO OFF indicator light is illuminated when the vehicle is stopped and either condition below is met:


    • Stop and Start system control is prohibited.

    • Stop and Start system control is canceled by operating the stop and start cancel switch.

  6. EFFECT OF MALFUNCTION ON STOP AND START SYSTEM OPERATION

    Depending on the malfunction, Stop and Start system control may be prohibited as a fail-safe function. The following table shows effects on the vehicle and areas to be inspected according to malfunctions in the Stop and Start system.

    Malfunctioning Area Malfunction DTC Output Data List Effect on Vehicle Area to be Inspected
    Input to engine stop and start ECU IGSW circuit Open P2531 IG Switch Stop and Start system control prohibited (ECO indicator does not blink) Harness or connector
    BATT circuit Open - -

    Stop and Start system control continues

    If any DTCs are stored, they will be cleared when the ignition switch is turned off

    		 Harness or connector
    +B circuit Open - Data List cannot be checked because power is not supplied to the engine stop and start ECU Stop and Start system control prohibited Harness or connector
    TMN (neutral position switch) circuit Stuck ON - Neutral Switch Stop and Start system control prohibited

    • Harness or connector

    • Neutral position switch
    Stuck OFF - Neutral Switch Stop and Start system control prohibited
    Input to engine stop and start ECU CLL (clutch start switch) circuit Stuck ON P1862 Clutch Lower SW Stop and Start system control prohibited/ECO indicator blinks

    • Harness or connector

    • Clutch start switch (lower)

    • Clutch switch (upper)
    Stuck OFF - Clutch Lower SW Stop and Start system control prohibited
    CLU (clutch switch) circuit Stuck ON P1862 Clutch Upper SW Stop and Start system control prohibited/ECO indicator blinks
    Stuck OFF - Clutch Upper SW Stop and Start system control prohibited
    TFAL (cooler thermistor) circuit Open - A/C Outlet Temp Automatic engine start request not made despite a high vent temperature

    • Harness or connector

    • Cooler thermistor
    Shorted - A/C Outlet Temp Automatic engine start request not made despite the air conditioning switch being turned on
    MOPS (oil pressure sensor) circuit Open - Oil Pressure Switch Oil pressure light not turned on when engine stalled

    • Harness or connector

    • Engine oil pressure switch
    Shorted - Oil Pressure Switch Oil pressure light always goes on
    SBL (heater relay) circuit Open - Blower Switch Automatic engine start request not made despite the heater being turned on

    • Harness or connector

    • Heater relay

    • Blower switch
    Shorted - Blower Switch Automatic engine start request not made despite the heater being turned on
    BNT1 (hood lock switch) circuit Stuck ON - Hood Courtesy Switch -

    • Harness or connector

    • Hood lock switch
    Stuck OFF - Hood Courtesy Switch Stop and Start system control prohibited despite the engine hood being closed
    Output from engine stop and start ECU VC/PB/E2 (vacuum sensor) circuit Open P1540 - Stop and Start system control prohibited/ECO indicator blinks

    • Harness or connector

    • Brake boost pressure sensor

    • Brake booster

    • Brake booster hose
    Shorted P1540 - Stop and Start system control prohibited/ECO indicator blinks
    Remains at intermediate value P1541 - Stop and Start system control prohibited/ECO indicator blinks
    ECAN (stop and start cancel switch) circuit Stuck ON - Cancel Switch Stop and Start system control prohibited

    • Harness or connector

    • Stop and start cancel switch
    Stuck OFF - Cancel Switch Stop and Start system control cannot be canceled by pressing the stop and start cancel switch
    DDON circuit

    • Open

    • Short

    • Internal circuit malfunction

    • Battery

    		 P323B State of BBC

    Stop and Start system control prohibited/ECO indicator blinks

    during the trip in which malfunction is detected

    • Harness or connector

    • Backup boost converter

    • Engine stop and start ECU

    • Battery
    STA circuit Stuck ON P1644 Starter Circuit Malfunction Stop and Start system control prohibited/ECO indicator blinks Engine stop and start ECU
    Stuck OFF P1644 Starter Circuit Malfunction Stop and Start system control prohibited/ECO indicator blinks Engine stop and start ECU
    Engine stop and start ECU EEPROM (memory in the engine stop and start ECU) Malfunction P062F - Stop and Start system control prohibited Engine stop and start ECU
    Related systems SFI MIL illuminated (DTCs for SFI system output) ECM 1 Stop and Start system control prohibited ECM (SFI system)
    Abnormal NE signal P0335

    • NE Sensor Circuit Open 2

    • NE Sensor Circuit Open 3

    		 Stop and Start system control prohibited/ECO indicator blinks ECM (crankshaft position sensor circuit)
    ABS/VSC ABS operating - ABS Running Stop and Start system control prohibited -
    Malfunction in wheel speed sensor Brake control system DTCs output

    • Vehicle Spd 1(ABS/VSC)

    • Vehicle Spd 2 (Spd Signal)

    		 Stop and Start system control prohibited

    • Harness or connector

    • Brake actuator assembly (skid control ECU)

    • Vehicle speed sensor
    EPS Not affected - - - -
    Meter Open in vehicle speed signal circuit P0500

    • Vehicle Spd 3 (Spd Signal)

    • Spd Sensor Malfunction 2

    		 Stop and Start system control prohibited/ECO indicator blinks

    • Harness or connector

    • Combination meter assembly
    Air conditioning system Malfunction in outside temperature sensor -

    • Ambient Temp Sensor

    • Air Conditioning ECU

    		 Stop and Start system control prohibited Outside temperature sensor circuit
    Brake Brake booster vacuum drops -

    • Brake Boost Pressure

    • Brake Negative Pressure

    		 Stop and Start system control prohibited Engine vacuum system
    Power source Malfunction in backup boost converter (voltage may have dropped) P323B State of BBC

    Stop and Start system control prohibited/ECO indicator blinks

    at the trip of detecting malfunction

    • Harness or connector

    • Backup boost converter

    • Battery
    Malfunction in charging system - Power Management Stop and Start system control prohibited Battery related systems, such as battery current sensor
    Low voltage P0562 Battery Abnormal Stop and Start system control prohibited/ECO indicator blinks Battery
    Others Number of starter operations Exceeds the specified limit P1545 Starter Count Error Stop and Start system control prohibited/ECO indicator blinks Starter replacement is requested.
    Jump starting Engine started with the engine hood open - Engine Hood Open

    Stop and Start system control prohibited

    (resumes when the ignition switch is turned off)

    		 Check for a history of roadside service or jump starting due to a dead battery
    CAN communication Communication interrupted

    • U0100

    • U0121

    • U0131

    • U0141

    • U0151

    • U0155

    • U0164

    		 -

    Stop and Start system control prohibited/ECO indicator blinks

    Tech Tips

    If the harness between stop and start ECU and combination meter is open, ECO indicator does not blink.

    • Applicable harness or connector

    • Applicable ECU