ELECTRONICALLY CONTROLLED BRAKE SYSTEM PROBLEM SYMPTOMS TABLE
If there are no DTCs but the problem still occurs, check the circuits for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
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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Since the hydraulic passage is blocked off by the master cut solenoid during electronically controlled brake system control, there is no kickback (vibration) to the brake pedal, creating a quiet sound even while the ABS is operating.
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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.
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Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| 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 | ||
| Check the brake actuator assembly using the intelligent tester. (Check brake actuator assembly operation using the Active Test function.) If abnormal, check the hydraulic circuit for leaks. | ||
| 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 | ||
| Check the brake actuator assembly using the intelligent tester. (Check brake actuator assembly operation using the Active Test function.) If abnormal, check the hydraulic circuit for leaks. | ||
| 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 | |
| Skid control ECU | ||
| ABS warning light abnormal (Does not come on) | ABS warning light circuit | |
| Skid control ECU | ||
| Brake warning light / red (malfunction) abnormal (Remains on) | Brake fluid level warning switch circuit | |
| Brake warning light / red (malfunction) circuit | ||
| Skid control ECU | ||
| Brake warning light / red (malfunction) abnormal (Does not come on) | Brake warning light / red (malfunction) circuit | |
| Skid control ECU | ||
| VSC and/or TRC does not operate | Check that traction control has not operated by carrying out diagnosis. | - |
| Check the DTC again and make sure that the normal system code is output. | ||
| IG power source circuit | ||
| Check the hydraulic circuit for leak. | - | |
| Front speed sensor circuit | ||
| Rear speed sensor circuit | ||
| Yaw rate and acceleration sensor circuit | ||
| Steering angle sensor circuit | ||
| 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. | ||
| Brake warning light / yellow (minor malfunction) abnormal (Remains on) | Brake warning light / yellow (minor malfunction) circuit | |
| Skid control ECU | ||
| Brake warning light / yellow (minor malfunction) abnormal (Does not come on) | Brake warning light / yellow (minor malfunction) circuit | |
| Skid control ECU | ||
| VSC OFF indicator light abnormal (Remains on) | VSC OFF indicator light circuit | |
| Skid control ECU | ||
| VSC OFF indicator light abnormal (Does not come on) | VSC OFF indicator light circuit | |
| Skid control ECU | ||
| Multi-information display (TRC OFF indicator) abnormal (Remains on) | Multi-information display (TRC OFF indicator) circuit | |
| Skid control ECU | ||
| Multi-information display (TRC OFF indicator) abnormal (Does not come on) | Multi-information display (TRC OFF indicator) circuit | |
| Skid control ECU | ||
| Slip indicator light abnormal (Remains on) | Slip indicator light circuit | |
| Skid control ECU | ||
| Slip indicator light abnormal (Does not come on) | Slip indicator light circuit | |
| 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 | ||
| If the symptoms still occur even after the above circuit in suspected areas has been inspected and proved to be normal, replace the skid control ECU. | ||
| Sensor check cannot be done | TS and CG terminal circuit | |
| Skid control ECU | ||
| Skid control buzzer abnormal | Skid control buzzer circuit | |
| Skid control ECU |