Diagnostic Aids

WARNING: This page is about a different car, the 1994 Pontiac Bonneville, 1994 Oldsmobile Eighty-Eight, and 1994 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.

An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside insulation. Check for:

Poor Connection Or Damaged Harness: Inspect wiring harness for an open or short to ground in serial data circuit, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection and damaged harness.
Intermittent Test: Observe ABS data on Tech 1 while moving related connectors and wiring harness. If failure is induced, Tech 1 data will stop updating. This may assist in isolating the location of the malfunction.

Fig 1: Code P1573 Schematic (3.8L) Traction Cntrl Fault Loss Of ABS/TCS Serial Data

Fig 2: Code P1573 Flow Chart (3.8L) Traction Cntrl Fault Loss Of ABS/TCS Serial Data