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)") | |
| Stop and start system operation prohibition based on the PM regeneration conditions (Refer to "Stop and Start System does not Operate (During PM Regeneration)") (for 1AD-FTV, 1ND-TV) | ||
| 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)*2 | ||
| Air conditioning system*2 | ||
| Brake booster vacuum is low (system prohibits control) | ||
| Brake booster vacuum is low | ||
| Backup boost converter circuit | ||
| Neutral position switch circuit | ||
| Crank position sensor*3 | ||
| Crank position sensor*4 | ||
| Crank position sensor*5 | ||
| ECM*3 | ||
| ECM*4 | ||
| ECM*5 | ||
| Vacuum sensor assembly | ||
| Brake booster assembly*6 | ||
| Brake booster assembly*7 | ||
| Starter assembly*3 | ||
| Starter assembly*4 | ||
| Starter assembly*5 | ||
| The deceleration sensor 0 point calibration is performed | ||
| Airbag sensor assembly (yaw rate sensor) | ||
| Skid control ECU (brake actuator assembly) | ||
| CAN communication system | ||
| Engine stop and start ECU | ||
| Battery*1, 3 | ||
| Battery*1, 4 | ||
| Battery*1, 5 | ||
| Wire harness or connector | - | |
| 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 | ECAN terminal voltage | |
| Stop and start system cancel switch (ecorun cancel switch assembly) | ||
| Stop and start cancel switch circuit | ||
| The engine is not stopped by stop and start control (stop and start operation is prohibited) | Engine hood courtesy switch circuit | |
| Driver side door courtesy switch circuit | ||
| Stop light switch assembly | ||
| Clutch start switch assembly (for lower) | ||
| Clutch start switch assembly (for upper) | ||
| Engine stop and start ECU | ||
| The shift lever is operated without depressing the clutch pedal (system operation prohibition) |
*1: 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, initialize the integrated current value* and drive the vehicle until stop and start control operation is permitted (approximately 15 to 40 minutes).
*: Disconnect the cables from the battery, wait for 30 seconds or more and then reconnect the cables.
*2: w/ Air Conditioning System
*3: for 1AD-FTV
*4: for 1ND-TV
*5: for 1NR-FE
*6: for LHD
*7: for RHD
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 15 to 40 minutes).