Tech Tips
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | See page |
|---|---|---|
| Stop and Start System does not operate | Stop and start system operation prohibition based on the battery conditions (Refer to "Stop and Start System does not Operate (Battery Condition)") | |
| Stop and start system operation prohibition based on the PM regeneration conditions (Refer to "Stop and Start System does not Operate (During PM Regeneration)")*7 | ||
| Engine hood courtesy switch circuit | ||
| Driver side door courtesy switch circuit (System prohibit control) | ||
| Driver side door courtesy switch circuit (CAN communication DTC U0140) | ||
| Driver side door courtesy switch circuit | ||
| Driver seat belt buckle switch circuit (System prohibits control) | ||
| Driver seat belt buckle switch circuit (CAN communication DTC U0140) | ||
| Front seat inner belt assembly (for driver side) | ||
| Air conditioning system (System prohibit control) | ||
| Air conditioning system*3 | ||
| Air conditioning system*4 | ||
| Brake booster vacuum is low (System prohibit control) | ||
| Brake booster vacuum is low | ||
| Backup boost converter circuit | ||
| Park/neutral position switch circuit*1 | ||
| Neutral position switch circuit*2 | ||
| Crank position sensor*5 | ||
| Crank position sensor*6 | ||
| Crank position sensor*7 | ||
| ECM*5 | ||
| ECM*6 | ||
| ECM*7 | ||
| No. 1 integration relay*5 | ||
| No. 1 integration relay*6 | ||
| No. 1 integration relay*7 | ||
| Vacuum sensor | ||
| Brake booster assembly | ||
| Starter signal circuit*1 | ||
| STA signal circuit*1 | ||
| Oil pump with motor assembly (Continuously variable transaxle assembly)*1 | ||
| Stop and Start System does not operate | Starter assembly*1, *5 | |
| Starter assembly*2, *5 | ||
| Starter assembly*6 | ||
| Starter assembly*7 | ||
| The deceleration sensor 0 point calibration is performed | ||
| Airbag sensor assembly (Yaw rate sensor) | ||
| Skid control ECU (brake actuator assembly) | ||
| CAN communication system (w/o Toyota Safety Sense) | ||
| CAN communication system (w/ Toyota Safety Sense) | ||
| Engine stop and start ECU | ||
| Battery*5, *8 | ||
| Battery*6, *8 | ||
| Battery*7, *8 | ||
| Wire harness or connector | - | |
| The starter does not operate | Battery*5 | |
| Battery*6 | ||
| Battery*7 | ||
| Starter assembly*1, *5 | ||
| Starter assembly*2, *5 | ||
| Starter assembly*6 | ||
| Starter assembly*7 | ||
| Park/neutral position switch circuit*1 | ||
| Neutral position switch circuit*2 | ||
| Starter signal circuit (for SFI system)*5 | ||
| Starter signal circuit (for SFI system)*6 | ||
| Starter signal circuit (for ECD system (w/ DPF))*7 | ||
| Starter signal circuit*1 | ||
| Cranking speed slows down | Battery*5 | |
| Battery*6 | ||
| Battery*7 | ||
| Starter Assembly*1, *5 | ||
| Starter Assembly*2, *5 | ||
| Starter Assembly*6 | ||
| Starter Assembly*7 | ||
| Stop and start cancel indicator does not operate | Combination meter assembly | |
| Indicator circuit (CAN communication DTC U0155) | ||
| Engine stop and start ECU | ||
| Stop and start indicator does not operate | Combination meter assembly | |
| Indicator circuit (CAN communication DTC U0155) | ||
| Engine stop and start ECU | ||
| Stop and start system control cannot be canceled | Stop and start cancel switch (warning canceling switch assembly) | |
| ECAN terminal voltage | ||
| Stop and start cancel switch circuit | ||
| The engine does not stop due to stop and start system control (stop and start system operation is prohibited) | Engine hood courtesy switch circuit | |
| Driver side door courtesy switch circuit | ||
| Stop light switch circuit | ||
| Engine stop and start ECU | ||
| When the stop and start cancel switch (warning canceling switch assembly) is pressed and held, the control mode does not change | Stop and start priority control system | |
| Control mode returns to default mode after turning ignition switch | Stop and start priority control system |
*1: for CVT
*2: for Manual Transaxle
*3: for Automatic Air Conditioning System
*4: for Manual Air Conditioning System
*5: for 1NR-FE
*6: for 1KR-FE
*7: for 1ND-TV
*8: When the vehicle has not been used for a long period, the battery capacity decreases, and stop and start control is disabled. In this case, first charge the battery and then using the GTS, initialize the integrated current item.
Tech Tips
If the Data List item "Integrated Current" indicates 0 or more, initialization is not necessary.