ANTI-LOCK BRAKE SYSTEM PROBLEM SYMPTOMS TABLE
Use the table below to help determine the cause of a problem. The likely causes of the problem are indicated in descending order. Check each suspected area in order. Repair or replace faulty parts or perform adjustments as necessary.
Note
When replacing the skid control ECU, sensor, etc., turn the ignition switch off.
Tech Tips
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Inspect the fuse and relay before investigating the suspected areas as shown in the table below.
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Inspect each malfunction circuit in order for the corresponding symptom.
| Symptom | Suspected Area | See page |
|---|---|---|
| ABS and/or EBD does not operate | Check the DTC again and make sure that the normal system code is output. | (*1) |
| IG power source circuit | ||
| Front speed sensor circuit | ||
| Rear speed sensor circuit | ||
| Check the brake actuator assembly with the intelligent tester. (Check brake actuator assembly operation using the Active Test function.) If abnormal, check the hydraulic circuit for leakage. | ||
| 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. | (*1) | |
| ABS and/or EBD does not operate efficiently | Check the DTC again and make sure that the normal system code is output. | (*1) |
| Front speed sensor circuit | ||
| Rear speed sensor circuit | ||
| Stop light switch circuit | ||
| Check the brake actuator assembly with the intelligent tester. (Check brake actuator assembly operation using the Active Test function.) If abnormal, check the hydraulic circuit for leakage. | ||
| 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. | (*1) | |
| ABS sensor DTC check cannot be done | Check the DTC again and make sure that the normal system code is output. | (*1) |
| 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. | (*1) | |
| ABS warning light abnormal (Remains on) | ABS warning light circuit | |
| Skid control ECU | (*1) | |
| ABS warning light abnormal (Does not come on) | ABS warning light circuit | |
| Skid control ECU | (*1) | |
| Brake warning light abnormal (Remains on) | Vacuum sensor circuit | |
| Brake warning light circuit | ||
| Skid control ECU | (*1) | |
| Brake warning light abnormal (Does not come on) | Brake warning light circuit | |
| Skid control ECU | (*1) | |
| Sensor check cannot be done | TS and CG terminal circuit | |
| Skid control ECU | (*1) |
(*1): See Pub. No. RM1008E