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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 107 (Engine Controls Self-Diagnostics) >> Diagnostic Tests >> DTC P1381: Misfire Detected - No EBCM/Pcm Serial Data >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Pontiac Montana, 2002 Oldsmobile Silhouette, and 2002 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ON the ignition. 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.
  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 is okay. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  4. Turn OFF the ignition. Disconnect the EBCM. Turn ON the ignition. Using a Digital Multimeter (DMM), measure voltage on the serial data circuit at the EBCM harness connector. Does the voltage vary within a range between 1-5 V? If yes, go to next step. If no, go to step  6.
  5. Inspect for a poor connection at the EBCM. 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. Did you find and correct the condition? If yes, go to next step. If no, see appropriate ANTI-LOCK/TCS article in BRAKES.
  7. Turn ON the ignition. Select chassis application on the scan tool. Attempt to display ABS data on the scan tool. Can ABS data be displayed? If yes, system is okay. If no, go to step  4.
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