ELECTRONICALLY CONTROLLED BRAKE SYSTEM PROBLEM SYMPTOMS TABLE
Note
When replacing the skid control ECU, sensor, etc., make sure that the power switch is turned OFF, the stop light switch is off, and 2 minutes have elapsed since the driver's door was closed.
Tech Tips
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Use the table below to help determine the cause of the problem symptom. 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.
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Since the oil passage is blocked off by the master cut solenoid during the electronically controlled brake system control, there is no kickback (vibration) to the brake pedal, creating a quiet operating sound even while the ABS is operating.
| Symptom | Suspected Area | See page |
|---|---|---|
| ABS, BA and/or EBD does not operate | Use a chassis dynamometer, etc. to check the electronically controlled brake system operation | - |
| Check the DTC again and make sure that the normal system code is output | ||
| IG power source circuit | ||
| Front speed sensor circuit | ||
| Rear speed sensor circuit | ||
| for LHD: Check the brake actuator with the intelligent tester (Check brake actuator operation using the Active Test function). If abnormal, check the hydraulic circuit for leakage. | ||
| for RHD: Check the brake actuator with the intelligent tester (Check brake actuator operation using the Active Test function). If abnormal, check the hydraulic circuit for leakage. | ||
| for LHD: If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU | ||
| for RHD: If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU | ||
| ABS, BA and/or EBD does not operate efficiently | Check the DTC again and make sure that the normal system code is output | |
| Front speed sensor circuit | ||
| Rear speed sensor circuit | ||
| for LHD: Check the brake actuator with the intelligent tester (Check brake actuator operation using the Active Test function). If abnormal, check the hydraulic circuit for leakage. | ||
| for RHD: Check the brake actuator with the intelligent tester (Check brake actuator operation using the Active Test function). If abnormal, check the hydraulic circuit for leakage. | ||
| for LHD: If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU | ||
| for RHD: If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU | ||
| VSC and/or TR(A)C does not operate | Check that traction control has not operated by carrying out diagnosis (Traction control does not operate while the VSC OFF switch is ON and the brake warning light / yellow (minor malfunction) and slip indicator light are ON) | - |
| Check the DTC again and make sure that the normal system code is output | ||
| IG power source circuit | ||
| Check the hydraulic circuit for leakage | - | |
| Front speed sensor circuit | ||
| Rear speed sensor circuit | ||
| Yaw rate and acceleration sensor circuit | ||
| Steering angle sensor circuit | ||
| for LHD: If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU | ||
| for RHD: If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU | ||
| Sensor signal check cannot be done | TS and CG terminal circuit | |
| for LHD: Skid control ECU | ||
| for RHD: Skid control ECU | ||
| DTC check cannot be done | Check the DTC again and make sure that the normal system code is output | |
| TC and CG terminal circuit | ||
| for LHD: If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU | ||
| for RHD: If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU | ||
| ABS warning light abnormal (Remains on) | ABS warning light circuit | |
| for LHD: Skid control ECU | ||
| for RHD: Skid control ECU | ||
| ABS warning light abnormal (Does not come on) | ABS warning light circuit | |
| for LHD: Skid control ECU | ||
| for RHD: Skid control ECU | ||
| Brake warning light / yellow (minor malfunction) (Multi-information display) abnormal (Remains on) | Brake warning light / yellow (minor malfunction) circuit | |
| for LHD: Skid control ECU | ||
| for RHD: Skid control ECU | ||
| Brake warning light / yellow (minor malfunction) (Multi-information display) abnormal (Does not come on) | Brake warning light / yellow (minor malfunction) circuit | |
| for LHD: Skid control ECU | ||
| for RHD: Skid control ECU | ||
| Brake warning light / red (malfunction) abnormal (Remains on) | Brake fluid level warning light switch circuit | |
| Brake warning light / red (malfunction) circuit | ||
| for LHD: Skid control ECU | ||
| for RHD: Skid control ECU | ||
| Brake warning light / red (malfunction) abnormal (Does not come on) | Brake warning light / red (malfunction) circuit | |
| for LHD: Skid control ECU | ||
| for RHD: Skid control ECU | ||
| Slip indicator light abnormal (Remains on / Does not come on) | Slip indicator light circuit | |
| for LHD: Skid control ECU | ||
| for RHD: Skid control ECU | ||
| VSC OFF indicator light abnormal (Remains on) | VSC OFF indicator light circuit | |
| for LHD: Skid control ECU | ||
| for RHD: Skid control ECU | ||
| VSC OFF indicator light abnormal (Does not come on) | VSC OFF indicator light circuit | |
| for LHD: Skid control ECU | ||
| for RHD: Skid control ECU | ||
| Skid control buzzer abnormal | Skid control buzzer circuit | |
| for LHD: Skid control ECU | ||
| for RHD: Skid control ECU | ||
| Brake hold standby indicator light abnormal | Brake hold operated conditions are not met | |
| Brake hold standby indicator light circuit | ||
| Brake hold switch circuit | - | |
| Brake hold operated indicator light abnormal | Brake hold operated conditions are not met | |
| Brake hold operated indicator light circuit | ||
| Emergency brake signal does not function* | Main body ECU | - |
| Luggage room junction block (Rear junction block ECU) | - | |
| Hazard warning switch | ||
| Stop light switch | ||
| Front speed sensor circuit | ||
| Rear speed sensor circuit | ||
| Yaw rate and acceleration sensor circuit | ||
| for LHD: Skid control ECU | ||
| for RHD: Skid control ECU |
Tech Tips
*: for Europe