Symptom Related Diagnostic Procedures

ABS Schematic: Diagnostic I:

NO SCAN TOOL DATA
Off board diagnostics should be able to communicate with the ABS control module whenever the key is in the ON or RUN position. The ABS control module does not flash codes, so a Scan tool must be used to view serial data information.

Chart I:

DIAGNOSTIC AIDS
If the scan tool cannot communicate with the ABS control module or the Powertrain Control Module (PCM):
^ Check the Data Link Connector (DLC) ground circuit for an open.
^ Check the DLC terminals for tightness.
^ Check scan tool connector pins for damage.
^ Check ABS ground and communication from DLC.
^ Verify proper operation of scan tool on a properly operating vehicle.