STOP AND START: STOP AND START SYSTEM: PRECAUTION; 2019 - 2021 MY RAV4 [11/2018

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.

If the vehicle has not been used for a long time, the auxiliary battery charge may be low and stop and start control operation may be prohibited. Until charging current decreases to 5 A or less, if integrated current value still does not increase to threshold value*1 or higher, initialize integrated current value*2 and drive vehicle until stop and start control operates (approximately 5 to 40 minutes).

*1: Refer to Description of Integrated Current Value Threshold
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*2: Using the Techstream, perform Integrated Current Value Initialization.
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PRECAUTIONS WHEN CONNECTING/DISCONNECTING CABLE TO/FROM NEGATIVE BATTERY TERMINAL

HINT:

If the cable is disconnected from the 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 Battery Charge Control" changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the battery fluid temperature at 11°C (51°F) or higher, the refresh charge will be completed.)
If the Techstream is not available and the Data List item "Status of Battery Charge Control" cannot be checked, charge the 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 battery has been reconnected, DTC P323A19 will be stored. Perform either of the following operations:

Powertrain > Stop and Start > Clear DTCs

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

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.

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. Moreover, initialization/learning of the air conditioning information, initialization/learning of the deceleration sensor zero point and checking the operation of oil pump with solenoid assembly 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" and "ST NO. 2 relay" must be also replaced.

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

If the vehicle is towed with all 4 wheels touching the ground, the stop and start system may be damaged.

If the vehicle must be towed with the 4 wheels on the ground, turn the ignition switch off and then turn the ignition switch to ON before towing the vehicle.