Diagnostic Aids

When diagnosing intermittent problems, select MALF HISTORY from Tech 1 scan tester ABS menu. Supplemental data can be used to duplicate problem. Ensure terminals make good connection. Measure motor resistance. Resistance should be approximately .5 ohm.

Fig 1: CODE 56 Schematic

Courtesy of GENERAL MOTORS CORP.

Fig 2: CODE 56 Flow Chart

Courtesy of GENERAL MOTORS CORP.