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
B22C0 Backup boost converter circuit Stop and start control is prohibited

  • Pass condition detected and engine switch turned on (IG)

  • DTCs (for overcurrent caused by audio volume setting) are cleared
P0335 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
P0560 Open in VB 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 engine switch turned on (IG)
P0562

  • Power source circuit

  • Low battery voltage

  • 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

Both of the following conditions are met for at 3 seconds or more while the engine is stopped by stop and start control and the generator is not generating electricity:


  • +B voltage 11.5 V or higher

  • Engine stopped
P0607 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 engine switch turned on (IG)
P060A 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 engine switch turned on (IG)
P060B Analog to digital converter (Engine stop and start ECU)

  • Stop and start control is prohibited

  • Engine stalls

 Pass condition detected and engine switch turned on (IG)
P0617 ST relay circuit Stop and start control is prohibited Pass condition detected and DTCs are cleared
P062F 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

 Number of starter operations and air conditioning information are registered correctly
P0641 Engine stop and start ECU

  • Stop and start control is prohibited

  • Engine stalls

 Pass condition detected and engine switch turned on (IG)
P0942

for 8AR-FTS:

Oil pump assembly with motor (Automatic transaxle assembly) circuit

for 3ZR-FAE:

Oil pump assembly with motor (Continuously variable transaxle assembly) circuit

 Stop and start control is prohibited Pass condition detected and DTCs are cleared

P1538

P1539

for 8AR-FTS:

Oil pump assembly with motor (Automatic transaxle assembly) circuit

for 3ZR-FAE:

Oil pump assembly with motor (Continuously variable transaxle 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

 Pass condition detected and engine switch turned on (IG)
P1540 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
P1541

  • Vacuum sensor assembly

  • Brake booster assembly

  • Check valve to connector tube 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

Either 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
P1545

  • Starter assembly

  • 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

  • DTCs and number of starter operations stored in the ECU (after replacing the starter) are cleared

  • Communication with ECM returns to normal and either of the following conditions (a) or (b) is met:


    1. The STA signal detected by the ECM and STA and STA2 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

    2. The STA signal detected by the ECM and STA and STA2 signals detected by the engine stop and start ECU are ON for 5 seconds and "Tandem Starter" displayed for "Starter Type" in the Data List.
P1589 G sensor zero point calibration incomplete

  • 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 engine switch turned on (IG)
P161D Starter delay 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 engine switch turned on (IG)

  • Time between STA (for starter pinion) turning on and STA2 (for starter motor) turning on becomes 0.016 seconds or more
P1644

  • Starter drive circuit

  • ST relay

  • ST NO. 2 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
P1780 Park/neutral position switch 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

 Pass condition detected and engine switch turned on (IG)
P2531 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

Both of the following conditions are met for 10 seconds or more:


  • Engine switch on (IG)

  • Normal communication with ECM
P323B 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 engine switch turned on (IG)
P33B3 Eco run vehicle converter assembly (external 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

 1 second after eco run vehicle converter assembly (external backup boost converter) circuit becomes idle
U0100 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 1.84 seconds
U0104 CAN communication (driving support ECU 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 2.16 seconds
U0121 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 4.44 seconds
U0126 CAN communication (spiral with sensor cable sub-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 1.44 seconds
U0131 CAN communication (power steering ECU 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 1.6 seconds
U0140 CAN communication (main body ECU (multiplex network 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
U0151 CAN communication (airbag ECU 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
U0164 CAN communication (air conditioning amplifier)

  • 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
U1110 CAN communication (clearance warning ECU 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