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Home >> Buick >> 1996 >> LeSabre Custom >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1381 - Misfire Detected No EBCM/Pcm Serial Data >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. Go to next step.
  2. Turn ignition on. Using scan tool, select CHASSIS APPLICATION and 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 for open or faulty connection between EBCM and PCM. If a problem is found, repair as necessary. Repair is complete. If no open is found, see DIAGNOSTIC AIDS.
  4. Turn ignition off. Disconnect EBCM connector. Turn ignition on. Using a DVOM, check voltage on EBCM harness connector serial data circuit. If voltage is 1-5 volts, go to next step. If voltage is not as specified, go to step 6).
  5. Check for faulty connection at EBCM. If faulty connection is found, repair as necessary and go to step 7). If connection is okay, go to next step.
  6. Check for open serial data circuit to EBCM. If open is found, repair as necessary and go to next step. If no open is found, perform ABS system diagnosis. See appropriate ANTI-LOCK BRAKE SYSTEM article in the BRAKES section.
  7. Turn ignition on. Using scan tool, select CHASSIS APPLICATION and attempt to display ABS DATA. If ABS DATA is displayed, repair is complete. If ABS DATA is not displayed, return to step 4).
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