Procedure

1. Using the Scan tool, check for PCM EC/TC codes and flags. If codes or flags are present, refer to the applicable diagnostic charts in the "Electronic Engine Controls Service Manual" and repair the condition. After verifying that condition has been repaired, download the new calibration according to Step 3.

2. If no codes or flags are present, monitor Scan tool data and verify all parameters are within specification. Refer to "Electronic Engine Controls Service Manual." If parameters are not within specification, repair the condition. After verifying that condition has been repaired, download the new calibration according to Step 3.

3. If no codes or flags are present and Scan tool data is within specification, download new calibration using the Saturn Service Stall System or refer to the "Electronic Engine Controls Service Manual."

IMPORTANT:
Before installing a new calibration, make a note of the transaxle calibration installed, and download the same transaxle calibration with the correct engine calibration.

1993 New ECM Calibration - DOHC (LLO) Engines

3534 DOHC (LLO) Federal engines with automatic transaxles built before, and including VIN PZ229154

3536 DOHC (LLO) California engines with automatic transaxles built before, and including VIN PZ229154

IMPORTANT:
After the new calibration has been installed, vehicle must be driven until operating temperature is reached. This allows the PCM to relearn variations in the fuel system electronic controls that improve driveability and engine idle.

IMPORTANT:
Verify that customer comment has been repaired. If problem still exists, refer to diagnostic procedures in the "Fuel/Air Intake/Exhaust Service Manual," and "Electronic Engine Controls Service Manual."