Inspection Procedure 10: ABS operates abnormally

COMMENT ON TROUBLE SYMPTOM

The cause depends on driving and road surface conditions, so diagnosis may be difficult. However, if no diagnosis code is display, carry out the following inspection.

PROBABLE CAUSES

The most likely causes for this case are:

Malfunction of the hydraulic brake booster (HBB)

DIAGNOSIS

STEP 1. Check the hydraulic brake booster (HBB).

Refer to

Q. Is the check result normal?

	It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .

	Replace the hydraulic brake booster (HBB). Then go to Step 2.

STEP 2. Retest the system.

Q. Do the brakes operate normally?

	The procedure is complete.

	Start over at Step 1.