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Home >> Buick >> 2002 >> Century Custom >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.1L Engine >> Diagnostic Tests >> DTC P1381: Misfire Detected No EBTCM/Pcm Serial Data >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Turn ignition on switch. Select chassis application on the scan tool. Attempt to display Anti-Lock Brake System (ABS) data on the scan tool. Can ABS data be displayed? If yes, go to next step. If no, go to step  4.
  3. Test the serial data circuit for an open or a poor connection between the PCM and the EBCM. Did you find and correct the condition? If yes, system okay. If no, problem is intermittent.
  4. Turn ignition off switch. Disconnect the EBCM. Turn ignition on switch. Using a Digital Multimeter (DMM), measure voltage on serial data circuit at EBCM harness connector. Does voltage vary within a range of 1-5 volts? If yes, go to next step. If no, go to step  6.
  5. Inspect for a poor connection at the EBCM/EBTCM. Did you find and correct the condition? If yes, go to step  7. If no, go to next step.
  6. Test for an open in the serial data circuit to the EBCM/EBTCM. Did you find and correct the condition? If yes, go to next step. If no, diagnose anti-lock brake systems. See appropriate ANTI-LOCK article in BRAKES.
  7. Turn ignition on switch. Select chassis application on the scan tool. Attempt to display ABS data on the scan tool. Can ABS data be displayed? If yes, go to next step. If no, go to step  4.
  8. Use the scan tool in order to clear the DTCs. Turn ignition off for 30 seconds. Start engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  9. Using scan tool, observe stored information and Capture Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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