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Auto Bleed Procedure

CAUTION: Perform manual bleeding or pressure bleeding procedure before performing auto bleeding procedure.
NOTE: Auto bleed procedure is used to provide a complete bleed procedure on 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) assembly 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 Data Link Connector (DLC) located under left side of instrument panel. Turn ignition on, with engine off. Using scan tool, select ABS/TCS system features. Select SPECIAL TESTS and then select AUTOMATED BLEED PROCEDURE.
  3. Bleed brake system using conventional bleeding procedure. See MANUAL BLEEDING PROCEDURE  or PRESSURE BLEEDING PROCEDURE . Follow scan tool menu-driven instructions until proper brake pedal height is achieved. If malfunctions are detected, bleeding procedure will be aborted.
  4. If Diagnostic Trouble Codes (DTCs) are set, scan tool will display DTCS PRESENT, or list DTCs depending on when DTCs were set. Select TROUBLE CODES to display or clear codes. If DTCs are set, proceed to DIAGNOSIS & TESTING . If bleed procedure was aborted but no DTCs are set, perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK . Repair ABS/TCS as necessary before continuing.
  5. When auto bleed procedure is complete, depress brake pedal. Brake pedal should be high and firm. If brake pedal is not high and firm, reinspect brake system for leaks or damage. If brake system is okay and pedal travel is still excessive, repeat auto bleed procedure.
  6. Remove scan tool. Remove pressure bleeding equipment if used. Reinstall wheels and lower vehicle. Fill master cylinder reservoir with fluid as necessary. Road test vehicle. If brake pedal is spongy, perform conventional brake bleeding procedure.
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