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Home >> Chevrolet >> 2002 >> Impala Base, 3.4 E >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.4L >> 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 ON the ignition 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. Refer to INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  4. Turn ignition off switch. Disconnect the EBCM. Turn ON the ignition switch. Using a Digital Multimeter (DMM) measure voltage on the serial data circuit at the EBCM harness connector. Does voltage vary between 1-5 volts? 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, diagnose anti-lock brake systems. See appropriate ANTI-LOCK article in BRAKES.
  7. Turn ON the ignition switch. 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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