Diagnostic Aids

When replacing motor pack, DO NOT  place hands near motor pack modulator gears. Gears may have enough preload tension to cause personal injury.

1. Connect Tech 1 scan tester. Perform ABS motor tension release special test before removing motor pack.
2. ABS will initialize when vehicle is driven at least 3 MPH (5 km/h).
   NOTE: System initialization alternates between left front/rear and right front/rear with each ignition cycle.
3. When diagnosing intermittent problems, select MALF HISTORY from Tech 1 scan tester ABS menu. Supplemental data can be used to duplicate problem.

Fig 1: Code 44 - Diagnostic Flowchart

Courtesy of GENERAL MOTORS CORP.