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Auto 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.
  2. Ensure battery is fully charged. Connect scan tool to DLC. Turn ignition on, with engine off. Using scan tool, establish communications with the ABS/TCS system. Select ABS/TCS then SPECIAL FUNCTION and then AUTOMATED BLEED PROCEDURE.
  3. Bleed basic brake system. See MANUAL BLEEDING PROCEDURE  or PRESSURE BLEEDING PROCEDURE  . Follow scan tool directions until desired brake pedal height is achieved. If bleed procedure is aborted, a malfunction is present. If a DTC is present, diagnose affected DTC first. If brake pedal is spongy, perform conventional brake bleeding procedure again.
  4. After diagnosing affected DTC or performing conventional brake system bleeding procedure, go to next step.
  5. When desired pedal height is achieved, depress brake pedal to check for firmness. Disconnect scan tool. Check brake fluid level. Road test vehicle.
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