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.
Note
When replacing the brake actuator assembly, sensor, etc., turn the ignition switch off.
| Symptom | Suspected Area | See page |
|---|---|---|
| ABS and/or EBD does not operate | Check for DTCs again and make sure that the normal system code is output. | |
| IG power source circuit (low power supply voltage malfunction) | ||
| IG power source circuit (high power supply voltage malfunction) | ||
| Front speed sensor circuit (comparison malfunction) | ||
| Front speed sensor circuit (open or short malfunction) | ||
| Front speed sensor circuit (output malfunction) | ||
| Rear speed sensor circuit (comparison malfunction) | ||
| Rear speed sensor circuit (open or short malfunction) | ||
| Rear speed sensor circuit (output malfunction) | ||
| Check the brake actuator assembly (skid control ECU) with the intelligent tester. (Check brake actuator assembly (skid control ECU) operation using the Active Test function.) If abnormal, check the hydraulic circuit for leaks. (for LHD) | ||
| Check the brake actuator assembly (skid control ECU) with the intelligent tester. (Check brake actuator assembly (skid control ECU) operation using the Active Test function.) If abnormal, check the hydraulic circuit for leaks. (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 brake actuator assembly (skid control ECU). | ||
| ABS and/or EBD does not operate efficiently | Check for DTCs again and make sure that the normal system code is output. | |
| Front speed sensor circuit (comparison malfunction) | ||
| Front speed sensor circuit (open or short malfunction) | ||
| Front speed sensor circuit (output malfunction) | ||
| Rear speed sensor circuit (comparison malfunction) | ||
| Rear speed sensor circuit (open or short malfunction) | ||
| Rear speed sensor circuit (output malfunction) | ||
| Stop light switch circuit | ||
| Check the brake actuator assembly (skid control ECU) with the intelligent tester. (Check brake actuator assembly (skid control ECU) operation using the Active Test function.) If abnormal, check the hydraulic circuit for leaks. | ||
| Check the brake actuator assembly (skid control ECU) with the intelligent tester. (Check brake actuator assembly (skid control ECU) 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 brake actuator assembly (skid control ECU). | ||
| ABS sensor DTC check cannot be done | Check for DTCs 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 the suspected area has been inspected and proved to be normal, replace the brake actuator assembly (skid control ECU). | ||
| ABS warning light abnormal (Remains on) | ABS warning light circuit | |
| Brake actuator assembly (Skid control ECU) | ||
| ABS warning light abnormal (Does not come on) | ABS warning light circuit | |
| Brake actuator assembly (Skid control ECU) | ||
| Brake warning light abnormal (Remains on) | Brake warning light circuit | |
| Brake actuator assembly (Skid control ECU) | ||
| Brake warning light abnormal (Does not come on) | Brake warning light circuit | |
| Brake actuator assembly (Skid control ECU) | ||
| Sensor check cannot be done | TS and CG terminal circuit | |
| Brake actuator assembly (Skid control ECU) |