VEHICLE STABILITY CONTROL SYSTEM PROBLEM SYMPTOMS TABLE
If there are no DTCs output and the problem still occurs, check the suspected areas for each problem symptom in the order given in the following table and proceed to the relevant troubleshooting page.
Note
When replacing the skid control ECU (brake actuator assembly), sensors, etc., turn the engine switch off.
Tech Tips
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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 | Link |
|---|---|---|
| ABS, BA and/or EBD does not operate | Check again to see if DTCs are output (If DTCs are output, perform diagnosis based on the DTCs that are output) |
|
| Power source circuit (low power supply voltage malfunction) | ||
| Power source circuit (high power supply voltage malfunction) | ||
| Front speed sensor circuit (output malfunction) | ||
| Rear speed sensor circuit (output malfunction) | ||
| Front speed sensor circuit (open or short malfunction) | ||
| Rear speed sensor circuit (open or short malfunction) | ||
| Front speed sensor circuit (comparison malfunction) | ||
| Rear speed sensor circuit (comparison malfunction) | ||
| Check the brake actuator assembly with the GTS. (Check brake actuator assembly operation using the Active Test function.) If abnormal, check the hydraulic circuit for leaks. (for LHD) | ||
| Check the brake actuator assembly with the GTS. (Check brake actuator assembly operation using the Active Test function.) If abnormal, check the hydraulic circuit for leaks. (for RHD) | ||
| If the symptom still occurs even after the suspected areas listed above have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly) (for LHD) | ||
| If the symptom still occurs even after the suspected areas listed above have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly) (for RHD) | ||
| ABS, BA and/or EBD does not operate efficiently | Check again to see if DTCs are output (If DTCs are output, perform diagnosis based on the DTCs that are output) |
|
| Front speed sensor circuit (output malfunction) | ||
| Rear speed sensor circuit (output malfunction) | ||
| Front speed sensor circuit (open or short malfunction) | ||
| Rear speed sensor circuit (open or short malfunction) | ||
| Front speed sensor circuit (comparison malfunction) | ||
| Rear speed sensor circuit (comparison malfunction) | ||
| Stop light switch circuit (open malfunction) | ||
| Stop light switch circuit (stuck off malfunction) | ||
| Check the brake actuator assembly with the GTS. (Check brake actuator assembly operation using the Active Test function.) If abnormal, check the hydraulic circuit for leaks. (for LHD) | ||
| Check the brake actuator assembly with the GTS. (Check brake actuator assembly operation using the Active Test function.) If abnormal, check the hydraulic circuit for leaks. (for RHD) | ||
| If the symptom still occurs even after the suspected areas listed above have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly) (for LHD) | ||
| If the symptom still occurs even after the suspected areas listed above have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly) (for RHD) | ||
| ABS sensor DTC check cannot be done | Check again to see if DTCs are output (If DTCs are output, perform diagnosis based on the DTCs that are output) |
|
| TC and CG terminal circuit | ||
| If the symptom still occurs even after the suspected areas listed above have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly) (for LHD) | ||
| If the symptom still occurs even after the suspected areas listed above have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly) (for RHD) | ||
| ABS warning light abnormal (remains on) | ABS warning light circuit | |
| Skid control ECU (brake actuator assembly) (for LHD) | ||
| Skid control ECU (brake actuator assembly) (for RHD) | ||
| ABS warning light abnormal (does not come on) | ABS warning light circuit | |
| Skid control ECU (brake actuator assembly) (for LHD) | ||
| Skid control ECU (brake actuator assembly) (for RHD) | ||
| Brake warning light abnormal (remains on) | Brake warning light circuit | |
| Skid control ECU (brake actuator assembly) (for LHD) | ||
| Skid control ECU (brake actuator assembly) (for RHD) | ||
| Brake warning light abnormal (does not come on) | Brake warning light circuit | |
| Skid control ECU (brake actuator assembly) (for LHD) | ||
| Skid control ECU (brake actuator assembly) (for RHD) | ||
| VSC and/or TRC does not operate | Check again to see if DTCs are output (If DTCs are output, perform diagnosis based on the DTCs that are output) |
|
| Power source circuit (low power supply voltage malfunction) | ||
| Power source circuit (high power supply voltage malfunction) | ||
| Check the hydraulic circuit for leaks | - | |
| Front speed sensor circuit (output malfunction) | ||
| Rear speed sensor circuit (output malfunction) | ||
| Front speed sensor circuit (open or short malfunction) | ||
| Rear speed sensor circuit (open or short malfunction) | ||
| Front speed sensor circuit (comparison malfunction) | ||
| Rear speed sensor circuit (comparison malfunction) | ||
| Yaw rate and acceleration sensor circuit (zero point malfunction) | ||
| Yaw rate and acceleration sensor circuit (power supply malfunction) | ||
| Yaw rate sensor circuit (comparison malfunction) | ||
| Acceleration sensor circuit (stuck or output malfunction) | ||
| Yaw rate and Acceleration sensor circuit (internal malfunction) | ||
| Steering angle sensor circuit (zero point malfunction) | ||
| Steering angle sensor circuit (zero point initialization or calibration malfunction) | ||
| Steering angle sensor circuit (power supply malfunction) | ||
| Steering angle sensor circuit (output malfunction) | ||
| Steering angle sensor circuit (internal malfunction) | ||
| If the symptom still occurs even after the suspected areas listed above have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly) (for LHD) | ||
| If the symptom still occurs even after the suspected areas listed above have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly) (for RHD) | ||
| VSC sensor DTC check cannot be done | Check again to see if DTCs are output (If DTCs are output, perform diagnosis based on the DTCs that are output) |
|
| TC and CG terminal circuit | ||
| If the symptom still occurs even after the suspected areas listed above have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly) (for LHD) | ||
| If the symptom still occurs even after the suspected areas listed above have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly) (for RHD) | ||
| VSC OFF switch abnormal | VSC OFF switch circuit | |
| Skid control ECU (brake actuator assembly) (for LHD) | ||
| Skid control ECU (brake actuator assembly) (for RHD) | ||
| Slip indicator light abnormal (remains on) | Slip indicator light circuit | |
| Skid control ECU (brake actuator assembly) (for LHD) | ||
| Skid control ECU (brake actuator assembly) (for RHD) | ||
| Slip indicator light abnormal (does not come on) | Slip indicator light circuit | |
| Skid control ECU (brake actuator assembly) (for LHD) | ||
| Skid control ECU (brake actuator assembly) (for RHD) | ||
| Sensor check cannot be done | TS and CG terminal circuit | |
| Skid control ECU (brake actuator assembly) (for LHD) | ||
| Skid control ECU (brake actuator assembly) (for RHD) |