VEHICLE STABILITY CONTROL SYSTEM PROBLEM SYMPTOMS TABLE
When replacing the skid control ECU (brake actuator assembly), sensor, etc., turn the ignition switch off.
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.
Symptom |
Suspected Area |
Link |
|---|---|---|
ABS, BA and/or EBD does not operate |
Check for DTCs again and make sure that the normal system code is output. |
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IG power source circuit (low power supply voltage malfunction) |
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IG power source circuit (high power supply voltage malfunction) |
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Front speed sensor circuit (comparison malfunction) |
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Front speed sensor circuit (open or short malfunction) |
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Front speed sensor circuit (output malfunction) |
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Rear speed sensor circuit (comparison malfunction) |
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Rear speed sensor circuit (open or short malfunction) |
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Rear speed sensor circuit (output malfunction) |
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Check the skid control ECU (brake actuator assembly) with the GTS. (Check skid control ECU (brake actuator assembly) operation using the Active Test function.) If abnormal, check the hydraulic circuit for leaks. |
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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 actuator assembly). |
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ABS, BA and/or EBD does not operate efficiently |
Check for DTCs again and make sure that the normal system code is output. |
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Front speed sensor circuit (comparison malfunction) |
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Front speed sensor circuit (open or short malfunction) |
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Front speed sensor circuit (output malfunction) |
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Rear speed sensor circuit (comparison malfunction) |
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Rear speed sensor circuit (open or short malfunction) |
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Rear speed sensor circuit (output malfunction) |
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Stop light switch circuit |
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Check the skid control ECU (brake actuator assembly) with the GTS. (Check skid control ECU (brake actuator assembly) operation using the Active Test function.) If abnormal, check the hydraulic circuit for leaks. |
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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 actuator assembly). |
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ABS sensor DTC check cannot be done |
Check for DTCs again and make sure that the normal system code is output. |
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TC and CG terminal circuit |
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If the symptoms still occur even after the above circuit in the suspected area has been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly). |
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ABS warning light abnormal (Remains on) |
ABS warning light circuit |
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Skid control ECU (brake actuator assembly) |
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ABS warning light abnormal (Does not come on) |
ABS warning light circuit |
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Skid control ECU (brake actuator assembly) |
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Brake warning light abnormal (Remains on) |
Brake warning light circuit |
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Skid control ECU (brake actuator assembly) |
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Brake warning light abnormal (Does not come on) |
Brake warning light circuit |
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Skid control ECU (brake actuator assembly) |
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VSC and/or TRC/TRAC does not operate |
Check for DTCs again and make sure that the normal system code is output. |
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IG power source circuit (low power supply voltage malfunction) |
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IG power source circuit (high power supply voltage malfunction) |
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Check the hydraulic circuit for leaks. |
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Front speed sensor circuit (comparison malfunction) |
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Front speed sensor circuit (open or short malfunction) |
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Front speed sensor circuit (output malfunction) |
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Rear speed sensor circuit (comparison malfunction) |
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Rear speed sensor circuit (open or short malfunction) |
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Rear speed sensor circuit (output malfunction) |
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Yaw rate and acceleration sensor (airbag sensor assembly) circuit (zero point malfunction) |
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Yaw rate and acceleration sensor (airbag sensor assembly) circuit (power supply malfunction) |
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Acceleration sensor (airbag sensor assembly) circuit (comparison malfunction) |
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Yaw rate sensor (airbag sensor assembly) circuit (comparison malfunction) |
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Yaw rate and acceleration sensor (airbag sensor assembly) circuit (stuck or output malfunction) |
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Yaw rate and acceleration sensor (airbag sensor assembly) circuit (internal malfunction) |
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Steering angle sensor (spiral with sensor cable sub-assembly) circuit (zero point malfunction) |
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Steering sensor (spiral with sensor cable sub-assembly) circuit (Zero point initialization or calibration malfunction) |
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Steering angle sensor (spiral with sensor cable sub-assembly) circuit (power supply malfunction) |
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Steering angle sensor (spiral with sensor cable sub-assembly) circuit (output malfunction) |
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Steering angle sensor (spiral with sensor cable sub-assembly) circuit (internal malfunction) |
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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 actuator assembly). |
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VSC sensor DTC check cannot be done |
Check for DTCs again and make sure that the normal system code is output. |
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TC and CG terminal circuit |
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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 (brake actuator assembly). |
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TRC/TRAC OFF indicator light abnormal (Remains on) |
TRC/TRAC OFF indicator light circuit |
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Skid control ECU (brake actuator assembly) |
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TRC/TRAC OFF indicator light abnormal (Does not come on) |
TRC/TRAC OFF indicator light circuit |
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Skid control ECU (brake actuator assembly) |
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VSC OFF indicator light abnormal (Remains on) |
VSC OFF indicator light circuit |
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Skid control ECU (brake actuator assembly) |
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VSC OFF indicator light abnormal (Does not come on) |
VSC OFF indicator light circuit |
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Skid control ECU (brake actuator assembly) |
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Slip indicator light abnormal (Remains on) |
Slip indicator light circuit |
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Skid control ECU (brake actuator assembly) |
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Slip indicator light abnormal (Does not come on) |
Slip indicator light circuit |
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Skid control ECU (brake actuator assembly) |
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Downhill assist control indicator light abnormal (Remains on)*1 |
Downhill assist control indicator light circuit |
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Skid control ECU (brake actuator assembly) |
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Downhill assist control indicator light abnormal (Does not come on)*1 |
Downhill assist control indicator light circuit |
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Skid control ECU (brake actuator assembly) |
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AUTO LSD indicator light abnormal (Remains on)*2 |
AUTO LSD indicator light circuit |
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Skid control ECU (brake actuator assembly) |
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AUTO LSD indicator light abnormal (Does not come on)*2 |
AUTO LSD indicator light circuit |
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Skid control ECU (brake actuator assembly) |
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Sensor check cannot be done |
TS and CG terminal circuit |
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Skid control ECU (brake actuator assembly) |
*1: w/ Downhill Assist Control
*2: for 2WD