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Automated Bleed Procedure

CAUTION: Perform MANUAL BLEEDING PROCEDURE or PRESSURE BLEEDING PROCEDURE before performing auto bleed procedure.
NOTE: Auto bleed procedure is used to provide a complete bleed procedure on Anti-Lock Brake System/Traction Control System (ABS/TCS) equipped vehicles. This procedure cycles system valves and runs the pump to purge air from circuits normally closed during non ABS/TCS (normal) brake system operation and bleeding. This procedure should be used when air is suspected in secondary circuits or when Brake Pressure Modulator Valve (BPMV) has been replaced.
  1. Raise and support vehicle. Remove wheels. Inspect brake system for leaks or damage. Repair as necessary before continuing. Connect pressure bleeder to master cylinder and pressurize to 30-35 psi (2.1-2.4 kg/cm2 ).
  2. Ensure battery is fully charged. Connect scan tool to DLC. Turn ignition on, engine off. Using scan tool, establish communications with the ABS/TCS system. Select ABS/TCS then Special Function and then AUTOMATED BLEED PROCEDURE.
  3. First part of automated bleed procedure will cycle pump and front release valves for one minute. After cycling has stopped, scan tool will enter a "cool down" mode and display a 3 minute timer. Auto bleed will not continue until this timer expired, and cannot be overridden.
  4. During next step, scan tool will request technician to open one of bleeder screws. Scan tool will then cycle respective release valve and pump motor for 1 minute. Scan tool will repeat step  3 for remaining bleeder screws.
  5. With bleeder tool still attached to vehicle and maintaining 35 psi (2.4 kg/cm2 ), scan tool will instruct technician to independently open each bleeder screw for approximately 20 seconds. This should allow any remaining air to be purged from brake lines.
  6. When automated bleed procedure is completed, scan tool will display appropriate message. Remove pressure from pressure bleeding tool and then disconnect tool from vehicle.
  7. Depress brake pedal to gauge pedal height and feel. Repeat procedure until pedal is acceptable. Remove scan tool from DLC connector. Install tire and wheel assemblies, if they were removed. Lower vehicle. Inspect brake fluid level in master cylinder. Road test vehicle while making sure brake pedal remains high and firm.
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