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

Toyota Yaris XP210 (2020-2022) 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...

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