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5A–30 BRAKE CONTROL SYSTEM Symptom Diagnosis The symptoms that cannot be indicated by warning light 1. ABS works frequently but vehicle does not decelerate. 2. Uneven braking occurs while ABS works. 3. The wheels lock during braking. 4. Brake pedal feel is abnormal. 5. Braking sound (from EHCU) is heard while not braking. These are all attributable to problems which cannot be Chart A-1 ABS Works Frequently But Vehicle Does Not Decelerate No. Symptom Diagnostic Flow Charts Without TECH 2 With TECH 2 1 ABS works frequently but vehicle does not decelerate. Chart A-1 Chart TA-1 2 Uneven braking occurs while ABS works. Chart A-2 Chart TA-2 3 The wheels are locked. Chart A-3 Chart TA-3 4 Brake pedal feel is abnormal. Chart A-4 — 5 Braking sound (from EHCU) is heard while not braking. Chart A-5 Chart TA-5 Step Action Yes No 1 Is braking force distribution normal between front and rear of Go to Step 2 Repair brake parts. Go to Step 8 2 Are axle parts installed normally? Go to Step 3 Repair axle parts. Go to Step 8 3 Is there play in each or any wheel speed sensor? Repair wheel speed sensor. Go to Step 8 Go to Step 4 4 Is there damage, or powered iron sticking to each or any wheel Replace sensor or sensor ring. Go to Step 8 Go to Step 5 5 Is the output of each wheel speed sensor normal? (Refer to chart Go to Step 6 Replace wheel speed sensor or repair harness. Go to Step 7 6 Is the input of 4WD controller normal? Go to Step 7 Replace controller or repair harness. Go to Step 7 7 Reconnect all components, ensure all components are properly Repeat the “Basic diagnostic flow chart" Go to Step 7 |