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 ignition switch turned to ON

  • 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 ignition switch turned to ON
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 ignition switch turned to ON
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 ignition switch turned to ON
P060B Analog to digital converter (Engine stop and start ECU)

  • Stop and start control is prohibited

  • Engine stalls

 Pass condition detected and ignition switch turned to ON
P0617 ST NO. 1 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 ignition switch turned to ON
P0942 Oil pump with motor assembly circuit Stop and start control is prohibited Pass condition detected and DTCs are cleared

P1538

P1539

 Oil pump with motor 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 ignition switch turned to ON
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 signal detected by the engine stop and start ECU are ON for 0.3 seconds and "Other than Tandem Starter" displayed for "Starter Type" in the Data List

    2. The STA signal detected by the ECM and STA signal detected by the engine stop and start ECU are ON for 5 seconds and "Other than 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 ignition switch turned to ON
P1644

  • 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
P1780 Park/neutral position switch assembly*1 Neutral position switch*2

  • 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
P1862

  • Clutch start switch assembly (for lower)

  • Clutch start switch assembly (for upper)

  • 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 pedal switch assemblies (for upper and lower) remain off for 0.5 seconds or more.
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

 Pass condition detected and ignition switch turned to ON
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
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 with sensor 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 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
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