1999 Saturn SL2 Automatic, MP6FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. 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 FAILURE RECORDS data for DTC P1573. Clear DTCs. Operate vehicle within conditions noted in FAILURE RECORDS data. Using scan tool, read SPECIFIC DTC. If scan tool displays that this DTC FAILED THIS IGN, return to step  2. If scan tool does not display that this DTC FAILED THIS IGN, repair is complete.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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