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 Test.
NOTE:
When replacing the brake actuator assembly, sensors, etc., turn the engine switch off.
HINT:
- 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.
VEHICLE STABILITY CONTROL SYSTEM
| Symptom | Suspected Area | See Test |
|---|---|---|
| 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.) | Refer to DTC CHECK / CLEAR |
| Power source circuit (Low power supply voltage malfunction) | Refer to DTC C1241: Low Power Supply Voltage Malfunction | |
| Power source circuit (High power supply voltage malfunction) | Refer to DTC C1417: High Power Supply Voltage Malfunction | |
| Front speed sensor circuit | Refer to DTC C1271: Low Output Signal of Front Speed Sensor RH (Test Mode DTC); DTC C1272: Low Output Signal of Front Speed Sensor LH (Test Mode DTC); DTC C1330: Open in Front Speed Sensor RH; DTC C1331: Open in Front Speed Sensor LH; DTC C1464: Front Speed Sensor RH; DTC C1465: Front Speed Sensor LH | |
| Rear speed sensor circuit | Refer to DTC C1273: Low Output Signal of Rear Speed Sensor RH (Test Mode DTC); DTC C1274: Low Output Signal of Rear Speed Sensor LH (Test Mode DTC); DTC C1332: Open in Rear Speed Sensor RH; DTC C1333: Open in Rear Speed Sensor LH; DTC C1466: Rear Speed Sensor RH; DTC C1467: Rear Speed Sensor LH | |
| Check the brake actuator assembly using the Techstream. (Check brake actuator assembly operation using the Active Test function.) If abnormal, check the hydraulic circuit for leaks. | Refer to ON-VEHICLE INSPECTION | |
| If the symptoms still occur even after the above suspected areas have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly). | Refer to REMOVAL | |
| 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.) | Refer to DTC CHECK / CLEAR |
| Front speed sensor circuit | Refer to DTC C1271: Low Output Signal of Front Speed Sensor RH (Test Mode DTC); DTC C1272: Low Output Signal of Front Speed Sensor LH (Test Mode DTC); DTC C1330: Open in Front Speed Sensor RH; DTC C1331: Open in Front Speed Sensor LH; DTC C1464: Front Speed Sensor RH; DTC C1465: Front Speed Sensor LH | |
| Rear speed sensor circuit | Refer to DTC C1273: Low Output Signal of Rear Speed Sensor RH (Test Mode DTC); DTC C1274: Low Output Signal of Rear Speed Sensor LH (Test Mode DTC); DTC C1332: Open in Rear Speed Sensor RH; DTC C1333: Open in Rear Speed Sensor LH; DTC C1466: Rear Speed Sensor RH; DTC C1467: Rear Speed Sensor LH | |
| Stop light switch circuit (On stuck malfunction) | Refer to DTC C1249: Open in Stop Light Switch Circuit | |
| Stop light switch circuit (Open malfunction) | Refer to DTC C1425: Open in Stop Light Switch Circuit | |
| Stop light switch circuit (Off stuck malfunction) | Refer to DTC C1426: Stop Light Switch OFF Stuck Malfunction | |
| Check the brake actuator assembly using the Techstream. (Check brake actuator assembly operation using the Active Test function.) If abnormal, check the hydraulic circuit for leaks. | Refer to ON-VEHICLE INSPECTION | |
| If the symptoms still occur even after the above suspected areas have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly). | Refer to REMOVAL | |
| 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.) | Refer to DTC CHECK / CLEAR |
| TC and CG terminal circuit | Refer to TC and CG Terminal Circuit | |
| If the symptoms still occur even after the above suspected areas have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly). | Refer to REMOVAL | |
| ABS warning light abnormal (Remains on) | ABS warning light circuit | Refer to ABS Warning Light Remains ON |
| Skid control ECU (Brake actuator assembly) | Refer to REMOVAL | |
| ABS warning light abnormal (Does not come on) | ABS warning light circuit | Refer to ABS Warning Light does not Come ON |
| Skid control ECU (Brake actuator assembly) | Refer to REMOVAL | |
| Brake warning light abnormal (Remains on) | Brake warning light circuit | Refer to Brake Warning Light Remains ON |
| Skid control ECU (Brake actuator assembly) | Refer to REMOVAL | |
| Brake warning light abnormal (Does not come on) | Brake warning light circuit | Refer to Brake Warning Light does not Come ON |
| Skid control ECU (Brake actuator assembly) | Refer to REMOVAL | |
| VSC and/or TR(A)C does not operate | Check again to see if DTCs are output. (If DTCs are output, perform diagnosis based on the DTCs that are output.) | Refer to DTC CHECK / CLEAR |
| Check system variant learning. | Refer to DTC C1288: Error in Matching of ECUs | |
| Check the engine control system. | Refer to DTC C1201: Engine Control System Malfunction | |
| Power source circuit (Low power supply voltage malfunction) | Refer to DTC C1241: Low Power Supply Voltage Malfunction | |
| Power source circuit (High power supply voltage malfunction) | Refer to DTC C1417: High Power Supply Voltage Malfunction | |
| Check the hydraulic circuit for leaks. | - | |
| Front speed sensor circuit | Refer to DTC C1271: Low Output Signal of Front Speed Sensor RH (Test Mode DTC); DTC C1272: Low Output Signal of Front Speed Sensor LH (Test Mode DTC); DTC C1330: Open in Front Speed Sensor RH; DTC C1331: Open in Front Speed Sensor LH; DTC C1464: Front Speed Sensor RH; DTC C1465: Front Speed Sensor LH | |
| Rear speed sensor circuit | Refer to DTC C1273: Low Output Signal of Rear Speed Sensor RH (Test Mode DTC); DTC C1274: Low Output Signal of Rear Speed Sensor LH (Test Mode DTC); DTC C1332: Open in Rear Speed Sensor RH; DTC C1333: Open in Rear Speed Sensor LH; DTC C1466: Rear Speed Sensor RH; DTC C1467: Rear Speed Sensor LH | |
| Yaw rate and acceleration sensor circuit (Sensor malfunction) | Refer to DTC C1234: Yaw Rate Sensor; DTC C1472: Acceleration Sensor | |
| Yaw rate and acceleration sensor circuit (Power supply voltage malfunction) | Refer to DTC C1381: Acceleration Sensor Power Supply Voltage Malfunction | |
| Acceleration sensor circuit (Comparison malfunction) | Refer to DTC C1420: Acceleration Sensor Malfunction | |
| Yaw rate sensor circuit (Comparison malfunction) | Refer to DTC C1436: Yaw Rate Sensor Malfunction | |
| Yaw rate and acceleration sensor circuit (Internal malfunction) | Refer to DTC C1419: Acceleration Sensor Internal Circuit; DTC C1435: Yaw Rate Sensor Internal Circuit | |
| Steering angle sensor circuit (Output malfunction) | Refer to DTC C1434: Steering Angle Sensor Output Malfunction | |
| Steering angle sensor circuit (Power source voltage malfunction) | Refer to DTC C1432: Steering Angle Sensor Power Source Voltage Malfunction | |
| Steering angle sensor circuit (Internal malfunction) | Refer to DTC C1433: Steering Angle Sensor Internal Circuit | |
| Replace the ECM. | Refer to REMOVAL | |
| If the symptoms still occur even after the above suspected areas have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly). | Refer to REMOVAL | |
| 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.) | Refer to DTC CHECK / CLEAR |
| TC and CG terminal circuit | Refer to TC and CG Terminal Circuit | |
| If the symptoms still occur even after the above suspected areas have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly). | Refer to REMOVAL | |
| TR(A)C OFF indicator light abnormal (Remains on) | TR(A)C OFF indicator light circuit | Refer to TRAC OFF Indicator Light Remains ON |
| Skid control ECU (Brake actuator assembly) | Refer to REMOVAL | |
| TR(A)C OFF indicator light abnormal (Does not come on) | TR(A)C OFF indicator light circuit | Refer to TRAC OFF Indicator Light does not Come ON |
| Skid control ECU (Brake actuator assembly) | Refer to REMOVAL | |
| VSC OFF indicator light abnormal (Remains on) | VSC OFF indicator light circuit | Refer to VSC OFF Indicator Light Remains ON |
| Skid control ECU (Brake actuator assembly) | Refer to REMOVAL | |
| VSC OFF indicator light abnormal (Does not come on) | VSC OFF indicator light circuit | Refer to VSC OFF Indicator Light does not Come ON |
| Skid control ECU (Brake actuator assembly) | Refer to REMOVAL | |
| Slip indicator light abnormal (Remains on) | Slip indicator light circuit | Refer to Slip Indicator Light Remains ON |
| Skid control ECU (Brake actuator assembly) | Refer to REMOVAL | |
| Slip indicator light abnormal (Does not come on) | Slip indicator light circuit | Refer to Slip Indicator Light does not Come ON |
| Skid control ECU (Brake actuator assembly) | Refer to REMOVAL | |
| Sensor check cannot be done | TS and CG terminal circuit | Refer to TS and CG Terminal Circuit |
| Skid control ECU (Brake actuator assembly) | Refer to REMOVAL | |
| Skid control buzzer assembly abnormal* | Skid control buzzer circuit | Refer to Skid Control Buzzer Circuit |
| Skid control ECU (Brake actuator assembly) | Refer to REMOVAL |
*: w/ Dynamic Radar Cruise Control