STOP AND START SYSTEM 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
P0335 Open in engine speed signal circuit

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

All of the following conditions continue for 10 seconds:


  • Normal communication with ECM

  • Engine speed 500 rpm or more

  • Engine speed (communication signal) 500 rpm or more

  • Difference between engine speed via pulse signal and engine speed via communication signal is less than 100 rpm
P0562

  • Generator circuit

  • Low battery voltage

  • AM21 voltage monitor

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

Both of the following conditions continue for at least 3 seconds while the engine is stopped due to Stop and Start system control and the generator is not generating electricity:


  • +B voltage 11.5 V or more

  • AM21 voltage 3.5 V or more

  • Engine stopped
P060B Analog to digital converter (Engine stop and start ECU)

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 After returning the normal state, turn the ignition switch to ON again.
P062F Engine stop and start ECU

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 A/C information and the number of starter operations have been successfully registered

P1538

P1539

AT oil pump

Oil pump relay

Engine stop and start ECU

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 After returning the normal state, turn the ignition switch to ON again.
P1540

Vacuum sensor assembly

Vacuum sensor assembly circuit

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 Sensor output is within standard range
P1541

  • Vacuum sensor assembly

  • Brake booster assembly

  • Brake booster hose

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

Either of the following conditions is met:


  • Vacuum changes while the brake pedal is depressed

  • There is a specified number of times that vacuum changes while the vehicle is driven faster than a certain vehicle speed
P1545

  • Starter assembly

  • Starter circuit

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

  • The number of starter operations stored in the ECU is cleared (after the starter is replaced)

  • Communication with ECM returns to normal and one of the following conditions (a) and (b) are met:


    1. When ECM STA is ON, starter signal is ON (determined if it remains ON for 0.3 seconds)

    2. When ECM STA is OFF, starter signal is OFF (determined if it remains OFF for 5 seconds)
P1589 G sensor zero point calibration incomplete

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 After returning the normal state, turn the ignition switch to ON again.
P1644

  • Starter drive circuit

  • ST relay

  • Engine stop and start ECU (STA circuit)

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 The voltage conditions in the ECU internal drive circuit for starter are correctly recognized when the engine is idling and restarted
P1780

Park/Neutral position switch*1

Neutral position switch*2

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 After returning the normal state, turn the ignition switch to ON again.
P1862

  • Clutch start switch (lower)

  • Clutch switch (upper)

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 Clutch pedal switches (upper and lower) remain off for 0.5 seconds or more.
P2531 Ignition switch circuit

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

All of the following conditions continue for at least 10 seconds:


  • Ignition switch ON

  • Normal communication with ECM
P323B

  • Eco run vehicle converter assembly (Backup boost converter)

  • Backup boost converter circuit

  • Engine stop and start ECU

  • Battery

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 After returning the normal state, turn the ignition switch to ON again.
U0100

CAN communication (ECM)

ECM

Engine stop and start ECU

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 Communication with engine stop and start ECU continues for 1.68 seconds
U0121

CAN communication (ABS/VSC)

Brake control ECU

Engine stop and start ECU

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 Communication with engine stop and start ECU continues for 4.8 seconds
U0131

CAN communication (EPS)

Power steering ECU

Engine stop and start ECU

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 Communication with engine stop and start ECU continues for 1.6 seconds
U0140

CAN communication (main body ECU)

Main body ECU

Engine stop and start ECU

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 Communication with engine stop and start ECU continues for 7.2 seconds
U0151

CAN communication (center airbag sensor)

Airbag sensor assembly

Engine stop and start ECU

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 Communication with engine stop and start ECU continues for 21.2 seconds
U0155

CAN communication (meter)

Combination meter assembly

Engine stop and start ECU

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 Communication with engine stop and start ECU continues for 21.2 seconds
U0164

CAN communication (A/C)

Air conditioning amplifier

Engine stop and start ECU

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 Communication with engine stop and start ECU continues for 21.2 seconds
U111A

CAN communication (ECM)

(powertrain bus)

ECM

Engine stop and start ECU

  • Stop and Start system control is prohibited

  • Engine is automatically restarted if a DTC is stored while the engine is stopped due to Stop and Start system control

 Communication with engine stop and start ECU continues for 6.2 seconds

*1: for CVT

*2: for Manual transaxle