Toyota Yaris: Stop And Start System / Stop and Start Priority Control System

NOTICE:

• Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.

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• After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.

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HINT:

• When stop and start priority control (Extended) is selected, the operation of the air conditioning system is limited. If the customer reports that the cooling effectiveness of the air conditioning system is poor, check the selected control mode. If stop and start priority control (Extended) is selected, cancel the control mode and check if the cooling effectiveness of the air conditioning system improves. If it improves, explain to the customer that the operation of the air conditioning system was limited by stop and start control.
• Depending on the vehicle conditions, the stop and start operation time may not change even if stop and start priority control (Extended) is selected.
• For wire harness and connector inspection procedures and precautions, refer to " "

HINT:

• Check each symptom by checking the suspected areas in the table below.
• By using the GTS and entering the following menus, the selected mode can be confirmed.

  Powertrain / Stop and Start / Data List / Stop & Start A/C Mode

Engine Hood Courtesy Switch Circuit

DESCRIPTION The engine stop and start ECU detects whether the engine hood is open or closed based on a signal received from the engine hood courtesy switch built into the hood lock assembly...

Backup Boost Converter Circuit

DESCRIPTION A backup boost converter is built into the engine stop and start ECU. The backup boost converter helps maintain the power source voltage when the engine is restarted by stop and start control...

Other information:

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Dtc Check / Clear

DTC CHECK / CLEAR CHECK DTC (a) Check for DTCs (Test Failed / Pending / Confirmed). Body Electrical > Pre-Collision System > Trouble Codes GTS Display Description Test Failed Represent malfunctions that were detected during the current trip...

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Engine Difficult to Start

DESCRIPTION Problem Symptom Suspected Area Trouble Area Engine does not crank Engine cranks slowly Auxiliary battery depletion Starter malfunction Starter system Auxiliary battery depletion Starter malfunction Starter circuit Excessive engine friction Engine Engine assembly Starting time is long Engine speed fluctuation due to abnormal combustion Idle speed too low or high The engine stalls immediately after starting Strong engine vibration due to above symptoms Ignition malfunction Deviation in air fuel ratio (Excessive or insufficient intake air volume or fuel supply) Insufficient compression Changes in load from another system Ignition system Spark plug Ignition coil assembly Fuel system Direct fuel injector assembly Port fuel injector assembly Fuel pump assembly (for high pressure side) Fuel pump (for low pressure side) Fuel pump control circuit Fuel suction plate sub-assembly Fuel main valve assembly Fuel line Purge VSV system Fuel quality (existence of foreign matter, degradation) Intake and exhaust systems Mass air flow meter sub-assembly Intake system (Air leaks or deposit accumulation) Throttle body with motor assembly Air fuel ratio sensor (sensor 1) Air fuel ratio sensor (sensor 2) Cam timing oil control solenoid assembly Variable Valve Timing system (VVT system) Other control systems ECM Wire harness or connector Knock control sensor Engine coolant temperature sensor Immobiliser system Engine Water control valve Engine assembly Crankshaft position sensor High load from another system Air conditioning system Power steering system Electrical load signal system SYMPTOM AND CAUSE OF SYSTEM MALFUNCTION HINT: The following are descriptions of the characteristics of each system malfunction...