LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2001 >> Century Custom >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 3.1L & 3.4L >> Diagnostic Tests >> DTC P1381: Misfire Detected - No Communication With Brake Control Module >> Diagnostic Procedure

Diagnostic Procedure

  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 can be displayed, go to next step. If ABS data cannot be displayed, go to step  4.
  3. Check serial data circuit for an open or poor connection between PCM and EBCM/EBTCM. Repair as necessary. After repairs, go to step  7. If circuit is okay, see INTERMITTENT TROUBLE CODE DETERMINATION  under SELF-DIAGNOSTIC SYSTEM.
  4. Turn ignition off. Disconnect EBCM/EBTCM located in left rear of engine compartment. Turn ignition on. Measure voltage between ground and serial data circuit terminal at EBCM/EBTCM connector. 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 for poor terminal connections at EBCM/EBTCM connector. Repair as necessary. After repairs, go to step  7. If connections are okay, go to next step.
  6. Check for an open or short to ground in serial data circuit. Repair as necessary. After repair is completed, go to next step. If circuit is okay, check ABS system. See appropriate ANTI-LOCK article in BRAKES.
  7. Turn ignition on. Using scan tool, attempt to display ABS data. If ABS data can be displayed, go to next step. If ABS data cannot be displayed, go to step  4.
  8. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within conditions noted in FAILURE RECORDS data. Using scan tool, read SPECIFIC DTC. If scan tool indicates that this DTC FAILED THIS IGN, return to step  2. If scan tool does not indicate that this DTC FAILED THIS IGN, go to next step.
  9. Using scan tool, observe all stored information. If scan tool displays any DTCs that have not been diagnosed, diagnose those DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display any DTCs, system is okay.
scientia non olet · About LEMON Manuals