Toyota CH-R Service Manual: ABS does not Operate

Toyota CH-R Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / ABS does not Operate

DESCRIPTION

When the vehicle stability control system is operating, as the input piston and output piston are not directly connected, the kickback of the brake pedal is minimal during ABS operation and the driver may not notice that ABS operated.

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform system variant learning.

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PROCEDURE

1.	BRAKE PROBLEM CHECK

(a) Check if the slip indicator light was illuminated or blinking when ABS did not operate.

HINT:

When the VSC system is normal and ABS is operating, the slip indicator light blinks.
When the VSC system is malfunctioning, the slip indicator light illuminates.

Result	Proceed to
The slip indicator light was blinking.	A
The slip indicator light was illuminated.	B

END

2.	CHECK DTC AND FREEZE FRAME DATA

(a) Using the Techstream, check DTCs and Freeze Frame Data.

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Chassis > ABS/VSC/TRAC/EPB > Trouble Codes

Result	Proceed to
DTCs are not output.	A
DTCs are output.	B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

3.	PERFORM OPERATION CHECK DRIVING

(a) Check that ABS operates using a drum tester or equivalent.

CAUTION:

When using a drum tester, enter Inspection Mode or VSC off mode and perform inspection with the TRAC and VSC systems disabled to prevent the vehicle from moving suddenly due to TRAC or VSC operation.

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OK:

ABS operates.

END

REPLACE BRAKE ACTUATOR ASSEMBLY

TRAC does not Operate

DESCRIPTION When ABS, TRAC or VSC is operating, the skid control ECU (brake actuator assembly) blinks the slip indicator light to inform the driver that slippage occurred. When in VSC off mode, or ...

ABS Operates Before Necessary When Braking

DESCRIPTION Troubleshooting for when ABS operates too soon due to a noisy signal from the speed sensor, a difference in output, etc. PROCEDURE 1. PERFORM TEST MODE (SIGNAL ...

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