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Be careful when performing electrical tests so as to prevent accidental shorting of terminals. Such 4.3.2 ROAD TESTING A COMPLAINT Some complaints will require a test drive as part of the repair verification procedure. The purpose of NOTE: After the repair of pump or speed WARNING: BEFORE ROAD TESTING A VEHICLE, BE SURE THAT ALL COMPONENTS ARE REASSEMBLED. DURING THE TEST DRIVE, DO NOT TRY TO THE DRBIII T SCREEN WHILE IN MOTION. DO NOT HANG THE DRB FROM HAVE AN ASSISTANT AVAILABLE TO OPERATE THE DRBIII T . 4.4 DIAGNOSIS 1. Your diagnostic test procedure must begin with a thorough visual inspection of the ABS for dam- 2. Connect the DRBIII t to the data link connector located under the dash. If the DRBIII t does not power up, check the power and ground supplies 3. Select ‘‘Antilock Brakes’’. Turn the ignition on. If the DRBIII t displays ‘‘No Response’’, perform the proper test. 4. Read and record all ABS diagnostic trouble codes. If the ‘‘CAB Power Feed Circuit’’ trouble 5. If there are no diagnostic trouble codes present, select ‘‘Inputs/Outputs’’ and read the brake test. If a problem with the ABS warning indica- 6. If no other problem are found, it will be neces- sary to road test the vehicle. THE DRBIII t MUST NOT BE CONNECTED TO THE 7. The following conditions should be considered ‘‘NORMAL’’ operation, and no repairs should be – Brake pedal feedback during an ABS stop (clicking, vibrating) – Clicking, groaning or buzzing at 10 Km/h (6 mph) (drive off self test) – Groaning noise during an ABS stop – Slight brake pedal drop and pop noise when ignition is initially turned on – Brake pedal ratcheting down at the end of an ABS stop 8. If the complaint is “ABS cycling” at the end of a stop at low speeds, it may be caused by a 9. After a road test in which no problems were found, refer to any Technical Service Bulletins 5.0 REQUIRED TOOLS AND DRBIII t (diagnostic read-out box) jumper wires 7 GENERAL INFORMATION |