Toyota Yaris: Stop And Start System / Fail-safe Chart

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Engine & Hybrid System / Stop And Start / Stop And Start System / Fail-safe Chart

FAIL-SAFE CHART

If any of the following DTCs are stored, the engine stop and start ECU enters fail-safe mode to preserve vehicle operability.

DTC	Component	Fail-safe Operation	Fail-safe Deactivation Condition
P033562	Open in engine speed signal circuit	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	All of the following conditions are met for 10 seconds: Normal communication with ECM Engine speed 500 rpm or higher Engine speed (communication signal) 500 rpm or higher Difference between engine speed from pulse signal and engine speed from communication signal is less than 100 rpm
P055500 P05552A	Vacuum sensor assembly Brake booster assembly Vacuum hose (brake booster hose)	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	One of the following conditions is met: Vacuum changes while the brake pedal is depressed Vacuum changes a specified number of times while the vehicle is being driven faster than a certain vehicle speed
P055511 P055515	Vacuum sensor assembly circuit	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Sensor output is within standard range
P060629	Engine stop and start ECU	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Pass condition detected and ignition switch turned to ON
P060B1C P060B49 P060B71	Analog to digital converter (Engine stop and start ECU)	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Pass condition detected and ignition switch turned to ON
P061519	ST NO. 1 relay circuit	Stop and start control is prohibited	Pass condition detected and DTCs are cleared
P061562	Starter circuit	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Communication with ECM returns to normal and one of the following conditions is met: The STA signal detected by the ECM and STA signals detected by the engine stop and start ECU are on for 0.3 seconds and "Tandem Starter" displayed for "Starter Type" in the Data List The STA signal detected by the ECM and STA signals detected by the engine stop and start ECU are off for 5 seconds and "Tandem Starter" displayed for "Starter Type" in the Data List.
P083011	Clutch switch assembly	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Clutch switch assembly and clutch pedal stroke sensor assembly remain off for 0.5 seconds or more.
P085011 P085015	Neutral position switch	Stop and start control is prohibited	Pass condition detected and ignition switch turned to ON
P154563	Starter assembly	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	DTCs and number of starter operations stored in the ECU (after replacing the starter) are cleared
P160F00	Charging control system	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Pass condition detected and ignition switch turned to ON
P164400	Starter drive circuit ST NO. 1 relay Engine stop and start ECU	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Voltage of engine stop and start ECU internal drive circuit for starter is correct when engine is idling and restarted
P16449E	Engine stop and start ECU	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Pass condition detected and ignition switch turned to ON
P253014	IG signal circuit	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	All of the following conditions are met for 10 seconds or more: Ignition switch ON Normal communication with ECM Ignition switch (communication) ON.
P30DF62 P30EF4B P323A00 P323A16 P323AA2 P323B29 P323B38	Backup boost converter circuit	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Pass condition detected and DTCs are cleared
P323A19	Backup boost converter circuit	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Pass condition detected and ignition switch turned to ON DTCs (for overcurrent caused by audio volume setting) are cleared
P33B300	External backup boost converter (eco run vehicle converter assembly) circuit	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	1 second after external backup boost converter (eco run vehicle converter assembly) circuit becomes idle
U010087	CAN communication (ECM)	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Communication with engine stop and start ECU continues for 2 seconds
U012687	CAN communication (steering sensor)	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Communication with engine stop and start ECU continues for 2 seconds
U012987	CAN communication (skid control ECU (brake actuator assembly))	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Communication with engine stop and start ECU continues for 4.4 seconds
U013187	CAN communication (power steering ECU)	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Communication with engine stop and start ECU continues for 2 seconds
U014087	CAN communication (main body ECU (multiplex network body ECU))	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Communication with engine stop and start ECU continues for 7.2 seconds
U015187	CAN communication (airbag sensor assembly)	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Communication with engine stop and start ECU continues for 21.2 seconds
U015587	CAN communication (combination meter assembly)	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Communication with engine stop and start ECU continues for 21.2 seconds
U016487	CAN communication (air conditioning amplifier assembly)	Stop and start control is prohibited Engine is automatically restarted if a DTC is stored while the engine is stopped by stop and start control	Communication with engine stop and start ECU continues for 21.2 seconds

Check Mode Procedure

CHECK MODE PROCEDURE HINT: Compared to normal mode, check mode is more sensitive to malfunctions. Therefore, check mode can detect malfunctions that cannot be detected in normal mode...

Data List / Active Test

DATA LIST / ACTIVE TEST DATA LIST HINT: Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts...

Other information:

Toyota Yaris XP210 (2020-2025) Owner's Manual: Starting the Engine

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Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Components

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