Preferred Method

1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4SECTION Preferred Method

Before bleeding system, using scan tool, place hydraulic ABS modulator/motor pack assembly displacement cylinder pistons in upper position. To position pistons, connect scan tool to Data Link Connector (DLC), and then select the MOTOR REHOME function. Motor rehome cannot be performed if any current Diagnostic Trouble Codes (DTCs) are set. Diagnose and repair DTCs. See DIAGNOSIS & TESTING. Bleed entire system using either MANUAL BLEEDING or PRESSURE BLEEDING procedure. If scan tool is not available, alternate method may be used. See ALTERNATE METHOD procedure.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.