LEMON Manuals: Even more car manuals for everyone
Home >> Cadillac >> 1998 >> DeVille Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Testing - Diagnostic >> DTC U1040: Loss Of Serial Communications - Abs >> Testing

DTC U1040: Loss Of Serial Communications - Abs: Testing

  1. If multiple class 2 DTCs are set as current (i.e., U1300, U1301, U1088 or U1153), check for an intermittent short to ground or battery in Purple wire between individual control WIRING DIAGRAMS .
  2. Check for disconnected EBTCM. If EBTCM is disconnected, DTC U1040 will set and ANTI-LOCK warning indicator will illuminate.
  3. If DTC is current, use a scan tool and attempt to establish communication with EBTCM. If communication cannot be established, diagnose and repair problem in EBTCM system. See procedures in ANTI-LOCK BRAKES article in BRAKES section. If communication can be established, replace IPC. See procedures in INSTRUMENT PANEL CLUSTER (IPC)  under REMOVAL & INSTALLATION. Perform IPC DIAGNOSTIC SYSTEM CHECK .
  4. If DTC is history, check for intermittent open in Purple wire between individual control modules. See WIRING DIAGRAMS .
scientia non olet · About LEMON Manuals