Toyota Yaris: Stop And Start System / Precaution

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / Stop And Start / Stop And Start System / Precaution

PRECAUTION

PRECAUTIONS WHEN INSPECTING STOP AND START SYSTEM

NOTICE:

When the audio and visual system volume is high, a fail-safe function may operate in order to maintain the operation of stop and start control. The fail-safe function is canceled when the ignition switch is turned off. Using the same power source for the audio and visual system and other systems allows the fail-safe functions to operate more precisely.

WHEN THE ENGINE STOP AND START ECU AND THE STARTER ASSEMBLY ARE REPLACED

NOTICE:

  • When the engine stop and start ECU is replaced, it is necessary to read the number of starter operations before replacement, and to store this number in the new engine stop and start ECU, and perform external backup boost converter (eco run vehicle converter assembly) existence learning. Moreover, initialization/learning of the air conditioning information and initialization/learning of the deceleration sensor 0 point are also required.

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  • When the starter assembly is replaced, the number of starter operations stored in the engine stop and start ECU must be reset.

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  • When the starter assembly is replaced, "ST NO. 1 relay" must be also replaced.
  • When the engine stop and start ECU has been replaced, perform ECU security key registration.

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PRECAUTIONS WHEN AUXILIARY BATTERY IS DISCHARGED AFTER LEAVING VEHICLE FOR A LONG TIME

HINT:

If the vehicle has not been driven for a long time, the auxiliary battery charge will be low and stop and start control operation will be prohibited. If the integrated current value does not exceed the threshold*1 even though the auxiliary battery has been charged until the charging current decreases to 5 A or less, perform an integrated current value initialization*2 and drive the vehicle for approximately 5 to 40 minutes until the stop and start system operates.

*1: Refer to System Description for details on the integrated current threshold.

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*2: Use the GTS to perform Integrated Current Value Initialization.

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PRECAUTIONS WHEN CONNECTING/DISCONNECTING CABLE TO/FROM NEGATIVE AUXILIARY BATTERY TERMINAL

HINT:

  • If the cable is disconnected from the auxiliary battery terminal, stop and start control is prohibited until refresh charge is completed.

    In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item Status of Auxiliary battery Charge Control changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the auxiliary battery fluid temperature at 11°C (52°F) or higher, the refresh charge will be completed.)

  • If the GTS is not available and the Data List item Status of Auxiliary battery Charge Control cannot be checked, charge the auxiliary battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.

    If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.

  • After the refresh charge completes, turn the ignition switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.

(a) If power is not supplied to the navigation system or audio and visual system when the ignition switch is turned to ON for the first time after the auxiliary battery has been reconnected, DTC P323A19 will be stored. Perform either of the following operations:

(1) Turn the ignition switch from ON to off twice.

(2) After turning the ignition switch from ON to off, clear the DTCs.

Powertrain > Stop and Start > Clear DTCs

IF THE ENGINE FAILS TO RESTART FROM IDLING STOP

NOTICE:

If the engine fails to restart when stopped by stop and start control, the brake actuator may be activated.

Brake actuator activation conditions:

  • When the engine fails to restart when stopped by stop and start control.
  • When the brake booster vacuum is insufficient.
  • When the vehicle speed is 3 km/h (2 mph) or more and the brake pedal is depressed*.

    *: When the engine is not running.

HINT:

  • When the engine fails to restart when stopped by stop and start control and the brake booster vacuum is insufficient, the brake actuator is activated to ensure the braking force.
  • When the brake actuator is activated, sound and vibration may be generated. This is not due to malfunction of the stop and start system or the vehicle.

PRECAUTIONS AFTER CHARGING AUXILIARY BATTERY

HINT:

If the auxiliary battery is replaced or charged with the cables connected after stop and start control has been prohibited due to a low auxiliary battery charge, perform the integrated current value initialization using the GTS.

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If the Data List item "Integrated Current" indicates 0 A-sec or more, initialization is not necessary.

PRECAUTIONS FOR FOUR-WHEEL TOWING

NOTICE:

  • When towing the vehicle, its four wheels must be lifted.

    If the vehicle is to be towed with all four wheels on the ground, turn the ignition switch off and then ON without starting the engine. Only tow the vehicle at speeds below 30 km/h (19 mph) for distances of less than 80 km in a forward direction.

  • If the towing speed or distance exceeds the above limits, or the vehicle is towed backward, the transaxle and stop and start system components may be damaged.

PRECAUTIONS WHEN REPLACING ECM

NOTICE:

  • When the ECM is replaced on a vehicle with a non-specified auxiliary battery, it is necessary to perform auxiliary battery type switching.

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  • Perform Registration (VIN registration or frame number registration) after replacing the ECM.

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    Stop And Start System

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    Parts Location

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    Categories

    Liftgate/Trunk Lid

    WARNING

    Never allow a person to ride in the luggage compartment/trunk

    Allowing a person to ride in the luggage compartment/trunk is dangerous. The person in the luggage compartment/trunk could be seriously injured or killed during sudden braking or a collision.

    Do not drive with the liftgate/trunk lid open

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