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)") | |
| Engine hood courtesy switch circuit | ||
| Driver door courtesy switch circuit (system prohibits control) | ||
| Driver door courtesy switch circuit (CAN communication DTC U0140) | ||
| Driver 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 prohibits control) | ||
| Air conditioning system (for Automatic Air Conditioning System) | ||
| Air conditioning system (for Manual Air Conditioning System) | ||
| Brake booster vacuum is low (system prohibits control) | ||
| Brake booster vacuum is low | ||
| Backup boost converter circuit | ||
| Neutral position switch circuit | ||
| ECM (for 1WW) | ||
| ECM (for 2WW) | ||
| Vacuum sensor assembly | ||
| Brake booster assembly | ||
| Starter assembly (for 1WW) | ||
| Starter assembly (for 2WW) | ||
| The deceleration sensor zero point calibration is performed | ||
| Deceleration sensor (yaw rate sensor) | ||
| Skid control ECU (brake actuator assembly) | ||
| CAN communication system | ||
| Engine stop and start ECU | ||
| Battery (for 1WW)* | ||
| Battery (for 2WW)* | ||
| Wire harness or connector | - | |
| Power steering system | ||
| Stop and start cancel indicator light does not operate | Combination meter assembly | |
| Indicator circuit (CAN communication DTC U0155) | ||
| Engine stop and start ECU | ||
| Stop and start indicator light does not operate | Combination meter assembly | |
| Indicator circuit (CAN communication DTC U0155) | ||
| Engine stop and start ECU | ||
| Stop and start control cannot be canceled | Stop and start cancel switch circuit | |
| ECAN terminal voltage | ||
| Stop and start system cancel switch (ecorun cancel switch assembly) | ||
| The engine is not stopped by stop and start control (stop and start operation is prohibited) | The shift lever is operated without depressing the clutch pedal (system operation prohibition) | |
| Engine hood courtesy switch circuit | ||
| Driver side door courtesy switch circuit | ||
| Stop light switch assembly | ||
| Clutch start 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 ignition switch ON | Stop and start priority control system |
*: If the vehicle has not been driven for a long time, the battery charge will be low and stop and start control operation will be prohibited. In this case, recharge the battery, using the GTS, initialize the integrated current value.
Tech Tips
When the cable is disconnected from the negative (-) battery terminal, stop and start control is prohibited for a certain amount of time. After connecting the cable, drive the vehicle until stop and start control is permitted (approximately 5 to 40 minutes).