ANTI-LOCK BRAKE SYSTEM PROBLEM SYMPTOMS TABLE
If there are no DTCs output 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 brake actuator assembly, sensor, etc., turn the ignition switch off.
Tech Tips
Inspect the fuse and relay before investigating the suspected areas as shown in the table below. Inspect each malfunction circuit in numerical order for the corresponding symptom.
| Symptom | Suspected area | See page |
|---|---|---|
| ABS does not operate | 1. Check the DTC again and make sure that the normal system code is output. | |
| 2. IG power source circuit | ||
| 3. Front speed sensor circuit | ||
| 4. Rear speed sensor circuit | ||
| 5. Check the brake actuator with the intelligent tester. If abnormal, check the hydraulic circuit for leakage. | - | |
| 6. Front skid control rotor | ||
| 7. Rear skid control rotor | ||
| 8. If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the brake actuator assembly. | ||
| ABS does not operate efficiently | 1. Check the DTC again and make sure that the normal system code is output. | |
| 2. Front speed sensor circuit | ||
| 3. Rear speed sensor circuit | ||
| 4. Stop light switch circuit | ||
| 5. Check the brake actuator with intelligent tester. If abnormal, check that hydraulic circuit for leakage. | - | |
| 6. Front skid control rotor | ||
| 7. Rear skid control rotor | ||
| 8. If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to normal, replace the brake actuator assembly. | ||
| ABS warning light abnormal (Remains on) | 1. ABS warning light circuit | |
| 2. Brake actuator assembly | ||
| ABS warning light abnormal (Does not come on) | 1. ABS warning light circuit | |
| 2. Brake actuator assembly | ||
| ABS sensor DTC check cannot be done | 1. Check the DTC again and make sure that the normal system code is output. | |
| 2. TC and CG terminal circuit | ||
| 3. If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to normal, replace the brake actuator assembly. | ||
| Test mode (Signal check) cannot be done | 1. TS and CG terminal circuit | |
| 2. Brake actuator assembly |