ELECTRONICALLY CONTROLLED BRAKE SYSTEM PROBLEM SYMPTOMS TABLE

If there are no DTCs but the problem still occurs, check the suspected areas for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.

Note

When replacing the skid control ECU (brake booster with master cylinder assembly), sensors, etc., make sure that the ignition switch is turned off, the stop light switch assembly is off, and 2 minutes have elapsed since the driver door was closed.

Tech Tips


  • Since the hydraulic passage is blocked off by the master cut solenoid during electronically controlled brake system control, there is no kickback (vibration) to the brake pedal, creating a quiet sound even while the ABS is operating.

  • 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.

Electronically Controlled Brake System
Symptom Suspected Area See page
ABS, BA and/or EBD does not operate Use a chassis dynamometer, etc. to check the electronically controlled brake system operation. -
Check again to see if DTCs are output. (If DTCs are output, perform diagnosis based on the DTCs that are output.)

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Power source circuit

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Front speed sensor circuit

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Rear speed sensor circuit

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Check the brake actuator (brake booster with master cylinder assembly) using the GTS. (Check brake actuator (brake booster with master cylinder 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 suspected areas have been inspected and proved to be normal, replace the skid control ECU (brake booster with master cylinder assembly) (for LHD).

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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 booster with master cylinder assembly) (for RHD).

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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.)

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Front speed sensor circuit

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Rear speed sensor circuit

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Check the brake actuator (brake booster with master cylinder assembly) using the GTS. (Check brake actuator (brake booster with master cylinder 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 suspected areas have been inspected and proved to be normal, replace the skid control ECU (brake booster with master cylinder assembly) (for LHD).

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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 booster with master cylinder assembly) (for RHD).

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ABS warning light abnormal (Remains on) ABS warning light circuit

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Skid control ECU (Brake booster with master cylinder assembly) (for LHD)

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Skid control ECU (Brake booster with master cylinder assembly) (for RHD)

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ABS warning light abnormal (Does not come on) ABS warning light circuit

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Skid control ECU (Brake booster with master cylinder assembly) (for LHD)

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Skid control ECU (Brake booster with master cylinder assembly) (for RHD)

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Brake warning light / red (malfunction) abnormal (Remains on) Brake fluid level warning switch circuit

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Brake warning light / red (malfunction) circuit

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Skid control ECU (Brake booster with master cylinder assembly) (for LHD)

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Skid control ECU (Brake booster with master cylinder assembly) (for RHD)

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Brake warning light / red (malfunction) abnormal (Does not come on) Brake warning light / red (malfunction) circuit

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Skid control ECU (Brake booster with master cylinder assembly) (for LHD)

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Skid control ECU (Brake booster with master cylinder assembly) (for RHD)

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VSC and/or TRC does not operate Check that traction control has not operated by carrying out diagnosis. (TRAC and VSC do not operate during VSC off mode.) -
Check again to see if DTCs are output. (If DTCs are output, perform diagnosis based on the DTCs that are output.)

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Power source circuit

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Check the hydraulic circuit for leaks. -
Front speed sensor circuit

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Rear speed sensor circuit

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Yaw rate and acceleration sensor circuit

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Steering angle sensor circuit

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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 booster with master cylinder assembly) (for LHD).

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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 booster with master cylinder assembly) (for RHD).

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Brake warning light / yellow (minor malfunction) abnormal (Remains on) Brake warning light / yellow (minor malfunction) circuit

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Skid control ECU (Brake booster with master cylinder assembly) (for LHD)

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Skid control ECU (Brake booster with master cylinder assembly) (for RHD)

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Brake warning light / yellow (minor malfunction) abnormal (Does not come on) Brake warning light / yellow (minor malfunction) circuit

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Skid control ECU (Brake booster with master cylinder assembly) (for LHD)

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Skid control ECU (Brake booster with master cylinder assembly) (for RHD)

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Slip indicator light abnormal (Remains on) Slip indicator light circuit

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Skid control ECU (Brake booster with master cylinder assembly) (for LHD)

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Skid control ECU (Brake booster with master cylinder assembly) (for RHD)

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VSC OFF switch abnormal VSC OFF switch circuit

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Skid control ECU (Brake booster with master cylinder assembly) (for LHD)

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Skid control ECU (Brake booster with master cylinder assembly) (for RHD)

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Slip indicator light abnormal (Does not come on) Slip indicator light circuit

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Skid control ECU (Brake booster with master cylinder assembly) (for LHD)

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Skid control ECU (Brake booster with master cylinder assembly) (for RHD)

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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.)

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TC and CG terminal circuit

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If the symptoms still occur even after the above suspected areas has been inspected and proved to be normal, replace the skid control ECU (brake booster with master cylinder assembly) (for LHD).

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If the symptoms still occur even after the above suspected areas has been inspected and proved to be normal, replace the skid control ECU (brake booster with master cylinder assembly) (for RHD).

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Sensor check cannot be done TS and CG terminal circuit

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Skid control ECU (Brake booster with master cylinder assembly) (for LHD)

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Skid control ECU (Brake booster with master cylinder assembly) (for RHD)

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Meter buzzer abnormal Meter buzzer circuit

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Skid control ECU (Brake booster with master cylinder assembly) (for LHD)

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Skid control ECU (Brake booster with master cylinder assembly) (for RHD)

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