Toyota Camry Manual page 994

BR–308
BRAKE SYSTEM – ANTI–LOCK BRAKE SYSTEM (ABS)
TROUBLESHOOTING
(TMM Made Vehicle BOSCH ABS)
HOW TO PROCEED WITH TROUBLESHOOTING
Perform troubleshooting in accordance with the procedure on the following pages.
(1) CUSTOMER PROBLEM ANALYSIS
Using the customer problem analysis check sheet for reference, ask the customer in as much detail
as possible about the problem.
(2) CHECK AND CLEAR THE DIAGNOSTIC TROUBLE CODES (PRECHECK)
If the ABS warning light lights up, and the ABS does not operate, the ECU stores diagnostic trouble
codes corresponding to the problem in memory.
Before confirming the trouble, first check the diagnostic trouble codes to see if there are any malfunc–
tion codes stored in memory. When there are malfunction codes, make a note of them, then clear
them and proceed to "3" Problem Symptom Confirmation".
(3) PROBLEM SYMPTOM CONFIRMATION, (4) SYMPTOM SIMULATION
Confirm the problem symptoms. If the problem does not recur, simulate the problem by initially
checking the circuits indicated by the diagnostic trouble code in step 2 , using "Problem simulation
method".
(5) DIAGNOSTIC TROUBLE CODE CHECK
Check the diagnostic trouble codes.
If a malfunction code is output, proceed to "6" Diagnostic Trouble Code Chart". If the normal code
is output, proceed to " 7" "Problem Symptoms Chart".
Be sure to proceed to " 6 "Diagnostic Trouble Code Chart" after steps "2" and "3" are completed. If
troubleshooting is attempted only by following the malfunction code stored in the memory, errors
could be made in the diagnosis.
(6) DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is confirmed in the diagnostic trouble code check, proceed to the inspection
procedure indicated by the matrix chart for each diagnostic trouble code.
(7) PROBLEM SYMPTOMS CHART
If the normal code is confirmed in the diagnostic trouble code check, perform inspection in accordance
with the inspection order in the problem symptoms chart.
(8) CIRCUIT INSPECTION
Proceed with diagnosis of each circuit in accordance with the inspection order confirmed in 6 and
7 . Determine whether the cause of the problem is in the sensor, actuators, wire harness and con–
nectars, or the ECU.
(9) SENSOR CHECK
Use the ABS warning light to check if each of the signals from the speed sensors are being input
correctly to the ECU. Instructions for this check are given in the circuit inspection.
(10) REPAIRS
After the cause of the problem is located, perform repairs by following the inspection and replacement
procedures in this manual.
(11) CONFIRMATION TEST
After completing repairs, confirm not only that the malfunction is eliminated, but also conduct a test
drive to make sure the entire ABS system is operating correctly.