| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018KDY |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE; 2018 - 2020 MY Sienna [11/2017 - ] | ||
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.
NOTICE:
When replacing the skid control ECU (brake actuator assembly), sensors, etc., turn the ignition 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 page |
|---|---|---|
|
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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Power source circuit (low power supply voltage malfunction) |
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Power source circuit (high power supply voltage malfunction) |
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Front speed sensor circuit (output malfunction) |
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Rear speed sensor circuit (output malfunction) |
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Front speed sensor circuit (open or short malfunction) |
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Rear speed sensor circuit (open or short malfunction) |
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Front speed sensor circuit (comparison malfunction) |
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Rear speed sensor circuit (comparison malfunction) |
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Check the skid control ECU (brake actuator assembly) with the Techstream. (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 (output malfunction) |
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Rear speed sensor circuit (output malfunction) |
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Front speed sensor circuit (open or short malfunction) |
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Rear speed sensor circuit (open or short malfunction) |
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Front speed sensor circuit (comparison malfunction) |
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Rear speed sensor circuit (comparison malfunction) |
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Stop light switch circuit (open malfunction) |
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Stop light switch circuit (stuck off malfunction) |
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Check the skid control ECU (brake actuator assembly) with the Techstream. (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. |
|
|
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 TRAC does not operate. |
Check for DTCs again and make sure that the normal system code is output. |
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|
Power source circuit (low power supply voltage malfunction) |
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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 (output malfunction) |
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Rear speed sensor circuit (output malfunction) |
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Front speed sensor circuit (open or short malfunction) |
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Rear speed sensor circuit (open or short malfunction) |
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Front speed sensor circuit (comparison malfunction) |
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Rear speed sensor circuit (comparison 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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VSC and/or TRAC does not operate. |
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 circuit (zero point malfunction) |
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Steering angle sensor circuit (zero point initialization or calibration malfunction) |
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Steering angle sensor circuit (power supply malfunction) |
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Steering angle sensor circuit (output malfunction) |
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Steering angle sensor 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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VSC OFF switch abnormal |
VSC OFF switch 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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Sensor check cannot be done. |
TS and CG terminal circuit |
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Skid control ECU (brake actuator assembly) |
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![2018 - 2020 MY Sienna [11/2017 - ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
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