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HOMESERVICE MANUALSBUICK1998RIVIERAREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODESDIAGNOSTIC TROUBLE CODESDTC P1381 - MISFIRE DETECTED NO EBCM/PCM SERIAL DATADIAGNOSTIC PROCEDURES
1998 Buick Riviera

Diagnostic Procedures

1998 Buick RivieraSECTION Diagnostic Procedures
  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing OBD system check, 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. Repair as necessary. If circuit or connection is okay, see DIAGNOSTIC AIDS.
  4. Turn ignition off. Disconnect EBCM harness 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 measured voltage is not 1-5 volts, go to step 6).
  5. Check for faulty connection at EBCM. Repair as necessary. After repairs, go to step 7). If connection is okay, go to next step.
  6. Check for open serial data circuit to EBCM. Repair as necessary. After repairs, go to next step. If circuit is okay, perform ABS system diagnosis. See ANTI-LOCK BRAKE SYSTEM article in 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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.