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

 After returning to the normal state, turn the ignition switch to ON again.
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 continue for at least 3 seconds 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

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

 After returning to the normal state, turn the ignition switch to ON again.
P060B Analog to digital converter (Engine stop and start ECU)

  • Stop and start control is prohibited

  • Engine stalls

 After returning to the normal state, turn the ignition switch to ON again.
P0617 ST/MGC, ST2 relay circuit Stop and start control is prohibited After returning to the normal state and clearing DTCs.
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

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

P1538

P1539

 Oil pump with motor 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

 After returning to the normal state and clearing DTCs.
P1540 Vacuum sensor assembly circuit

  • Stop and start control is prohibited

  • 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

  • There is a specified number of times that vacuum changes 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

  • After replacing the starter assembly, when the number of starter operations is cleared and the diagnostic codes are erased

  • When communication with the ECM is activated and normal, and any of the following can be confirmed


    1. For 0.3 seconds, the STA signal in the EFI system is on, and STA and STA2 signals for the stop and start system are on with the starter identification information is tandem starter

    2. For 5 seconds, the STA signal in the EFI system is off, and STA and STA2 signals for the stop and start system are off with the starter identification information is tandem starter
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

 After returning to the normal state, turn the ignition switch to ON again.
P161D Starter delay circuit malfunction

  • 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

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

  • When the time required for transition from engine stop and start ECU STA (for plunging) ON to STA2 (for motor) ON reaches 0.016 seconds
P1644

  • Starter drive circuit

  • ST/MGC, ST2 relay

  • Engine stop and start ECU (STA2 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

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

  • 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

 After returning to the normal state, turn the ignition switch to ON again.
P2531 Ignition switch 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 continue for at least 10 seconds:


  • Ignition switch ON

  • 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

 After returning to the normal state, turn the ignition switch to ON again.
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 1.6 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 cable sub-assembly (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 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 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
U0155 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
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