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 | Link |
|---|---|---|
| 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)") | |
| Engine hood courtesy switch circuit | ||
| Driver door courtesy switch circuit (system prohibits control) | ||
| Driver door courtesy switch circuit (CAN communication DTC U014087) | ||
| Driver door courtesy switch circuit | ||
| Driver seat belt buckle switch circuit (system prohibits control) | ||
| Driver seat belt buckle switch circuit (CAN communication DTC U014087) | ||
| Front seat inner belt assembly (for driver side) (w/ Occupant Classification System) | ||
| Front seat inner belt assembly (for driver side) (w/o Occupant Classification System) | ||
| Air conditioning system (system prohibits control) | ||
| Air conditioning system | ||
| Brake booster vacuum is low (system prohibits control) | ||
| Brake booster vacuum is low | ||
| Backup boost converter circuit | ||
| Neutral position switch circuit | ||
| Starter signal circuit | ||
| STA signal circuit | ||
| Starter inrush current reduction relay circuit | ||
| Crank position sensor (for 8AR-FTS: w/ Canister Pump Module) | ||
| Crank position sensor (for 8AR-FTS: w/o Canister Pump Module) | ||
| Crank position sensor (for 3ZR-FAE) | ||
| ECM (for 8AR-FTS: w/ Canister Pump Module) | ||
| ECM (for 8AR-FTS: w/o Canister Pump Module) | ||
| ECM (for 3ZR-FAE) | ||
| Relay | - | |
| Vacuum sensor assembly | ||
| Brake booster assembly (for LHD) | ||
| Brake booster assembly (for RHD) | ||
| for 8AR-FTS: Oil pump assembly with motor (automatic transaxle assembly) for 3ZR-FAE: Oil pump assembly with motor (continuously variable transaxle assembly) |
||
| Starter assembly (for 8AR-FTS) | ||
| Starter assembly (for 3ZR-FAE) | ||
| The deceleration sensor 0 point calibration is performed | ||
| Deceleration sensor (airbag sensor assembly) | ||
| Skid control ECU (brake actuator assembly) | ||
| CAN communication system | ||
| Engine stop and start ECU | ||
| Battery*1 (for 8AR-FTS) | ||
| Battery*1 (for 3ZR-FAE) | ||
| Wire harness or connector | - | |
| Starter assembly does not operate | Battery (for 8AR-FTS) | |
| Battery (for 3ZR-FAE) | ||
| Starter assembly (for 8AR-FTS) | ||
| Starter assembly (for 3ZR-FAE) | ||
| Park/neutral position switch assembly (for U661E) | ||
| Park/neutral position switch assembly (for U661F) | ||
| Park/neutral position switch assembly (for K114) | ||
| Park/neutral position switch assembly (for K114F) | ||
| Entry and start system (for start function) (w/ Entry and Start System) | ||
| Push-button start (w/o Entry and Start System) | ||
| SFI system (for 8AR-FTS: w/ Canister Pump Module) | ||
| SFI system (for 8AR-FTS: w/o Canister Pump Module) | ||
| SFI system (for 3ZR-FAE) | ||
| Starter signal circuit | ||
| Cranking speed decreases | Battery (for 8AR-FTS) | |
| Battery (for 3ZR-FAE) | ||
| Starter inrush current reduction relay circuit | ||
| Starter assembly (for 8AR-FTS) | ||
| Starter assembly (for 3ZR-FAE) | ||
| Stop and start cancel indicator light does not operate | Combination meter assembly | |
| Indicator circuit (CAN communication system) | ||
| Engine stop and start ECU | ||
| Stop and start indicator light does not operate | Combination meter assembly | |
| Indicator circuit (CAN communication system) | ||
| Engine stop and start ECU | ||
| Stop and start control cannot be canceled | ECAN terminal voltage | |
| Stop and start cancel switch circuit | ||
| Engine not stopped by stop and start control (stop and start operation prohibited) | Engine hood courtesy switch circuit | |
| Driver side door courtesy switch circuit | ||
| Stop light switch assembly | ||
| Engine stop and start ECU | ||
| Multi-information display screen does not change after pressing steering pad switch assembly. | Stop and start priority control system | |
| Multi-information display screen changes without pressing steering pad switch assembly | Stop and start priority control system | |
| Multi-information display screen does not change but control mode changes | Stop and start priority control system | |
| Multi-information display screen changes but control mode does not change | Stop and start priority control system | |
| Control mode returns to default mode after turning engine switch on (IG) | Stop and start priority control system |
*1: If the vehicle has not been used for a long time, the battery charge may be low and stop and start control operation may be prohibited. In this case, recharge the battery, initialize the integrated current value* and drive the vehicle approximately 5 to 40 minutes until stop and start control operation is permitted.
*: Use the GTS to perform Integrated Current Value Initialization.
Tech Tips
If the Data List item "Integrated Current" is 0 or higher, it is not necessary to perform initialization.