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Home >> Chevrolet >> 1998 >> Venture Base, Van Cargo Extended >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1573 - EBTCM/Pcm Serial Data Circuit >> Diagnostic Procedures

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. Using scan tool, select ABS DATA. If scan tool displays ABS DATA, go to next step. If scan tool does not display ABS DATA, go to step 4).
  3. Turn ignition off. Disconnect EBTCM and PCM connectors. Check UART circuit for open between EBTCM and PCM. Repair as necessary. After repairs, go to step 8). If circuit is okay, go to step 5).
  4. Turn ignition off, disconnect EBTCM. Turn ignition on. Using a DVOM, check voltage of UART circuit between engine ground and EBTCM harness connector. If voltage constantly varies between zero and 5 volts, go to step 6). If voltage does not vary as specified, diagnose and repair SDL circuit.
  5. Check UART circuit for faulty connection at PCM. If faulty connection is found, repair as necessary. After repairs, go to step 8). If connection is okay, see DIAGNOSTIC AIDS.
  6. Check UART circuit for faulty connection at EBTCM. If faulty connection is found, repair as necessary. After repairs, go to step 8). If connection is okay, go to next step.
  7. Replace EBTCM. After replacing EBTCM, go to next step.
  8. Read and record FAIL RECORDS data for DTC P1573. Clear DTCs. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, read SPECIFIC DTC. If scan tool displays DTC P1573 FAILED THIS IGN, return to step 2). If scan tool does not display DTC P1573 FAILED THIS IGN, repair is complete.
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