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Home >> Oldsmobile >> 1997 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1573 - EBTCM/Pcm Serial Data Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the BASIC TESTING - 3.8L article. After performing OBD system check, go to next step.
  2. Using scan tool, attempt to select ABS data. If ABS data is displayed, go to next step. If ABS data cannot be displayed, go to step 4).
  3. Turn ignition off. Disconnect PCM and EBTCM. Check for an open in serial data circuit 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 DVOM, measure voltage between ground and serial data circuit terminal at EBTCM harness connector. If voltage constantly varies from zero to 5 volts, go to next step. If voltage does not constantly vary from zero to 5 volts, check for open or short in serial data circuit. Repair as necessary.
  5. Check serial data circuit for poor terminal connection at PCM. Repair as necessary. After repairs, go to step 8). If connection is okay, see DIAGNOSTIC AIDS.
  6. Check serial data circuit for poor terminal connection at EBTCM. 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. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Start engine and operate vehicle within conditions required for setting this DTC, and as close to conditions recorded in FREEZE FRAME as possible. Monitor SPECIFIC DTC info for DTC P1573 until DTC P1573 test runs. If scan tool indicates FAILED THIS IGN, repeat step 2). If scan tool does not indicate FAILED THIS IGN, repair is complete.
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