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Home >> Buick >> 2001 >> Regal LS >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P1381: Misfire Detected - No Communication With Brake Control Module >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK . After performing powertrain diagnostic system check, go to next step.
  2. Turn ignition on. Using scan tool, attempt to display ABS DATA. If ABS DATA is displayed, go to next step. If ABS DATA is not displayed, go to step  4.
  3. Check serial data circuit (Purple wires) for open or faulty connection between EBCM and PCM. If problem was found, repair as necessary. After repairs, go to step  7. If problem was not found, go to next step.
  4. Turn ignition off. Disconnect EBCM connector. Turn ignition on. Using a DVOM, check voltage on EBCM connector serial data circuit (Purple wires). If voltage reading is 1-5 volts, go to next step. If voltage reading is not 1-5 volts, go to step  6.
  5. Check EBCM connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  7. If problem was not found, go to next step.
  6. Check for open in Purple wire to EBCM. If problem was found, repair as necessary. After repairs, go to next step. If problem was not found, perform ABS system diagnosis. See appropriate ANTI-LOCK article in BRAKES.
  7. Turn ignition on. Using scan tool, attempt to display ABS DATA. If ABS DATA is displayed, repair is complete. If ABS DATA is not displayed, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in appropriate BODY CONTROL MODULES article.
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