PROBLEM SYMPTOMS TABLE
NOTICE:
When replacing the skid control ECU (brake actuator assembly), sensor, etc., turn the ignition switch off.
HINT:
Symptom |
Suspected Area |
See page |
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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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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 (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 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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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 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. |
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TC and CG terminal circuit*2 |
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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 (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 cable with sensor sub-assembly) circuit (zero point malfunction) |
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Steering sensor (Spiral cable with sensor sub-assembly) circuit (Zero point initialization or calibration malfunction) |
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Steering angle sensor (Spiral cable with sensor sub-assembly) circuit (power supply malfunction) |
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Steering angle sensor (Spiral cable with sensor sub-assembly) circuit (output malfunction) |
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Steering angle sensor (Spiral cable with sensor sub-assembly) circuit (internal malfunction) |
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If the symptoms still occur even after the above circuit 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*2 |
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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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AUTO LSD indicator light abnormal (Remains on) |
AUTO LSD indicator circuit |
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Skid control ECU (brake actuator assembly) |
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AUTO LSD indicator light abnormal (Does not come on) |
AUTO LSD indicator 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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The rear differential lock indicator light blinks when the rear differential cannot be unlocked for 2 consecutive trips.*1 |
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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*2 |
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Skid control ECU (brake actuator assembly) |
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VSC warning buzzer abnormal |
VSC warning buzzer circuit |
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Skid control ECU (brake actuator assembly) |
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System Diagram
SYSTEM DIAGRAM
Communication Table
Sender ECU
Receiver ECU
Signal
Line
*1: for Vacuum Brake Booster
*2: for Hydraulic Brake Booster
Forward Recognition Camera
Combination Meter Assembly
...
Terminals Of Ecu
TERMINALS OF ECU
1. CHECK DRIVER SIDE JUNCTION BLOCK AND MAIN BODY ECU (MULTIPLEX NETWORK BODY
ECU)
(a) Disconnect the MB main body ECU (multiplex network body ECU) connectors.
(b) Measure the voltage and resistance according to the value(s) in the table
below.
HINT:
Measure the values on ...
Installation
INSTALLATION
CAUTION / NOTICE / HINT
CAUTION:
Some of these service operations affect the SRS airbag system. Read
the precautionary notices concerning the SRS airbag system before servicing
(See page ).
If the side airbag was deployed, replace the front seat assembly with
...