MIL Service Engine Soon Telltale Lamp On with DTC P0327 in PCM Memory

The malfunction indicator lamp (MIL) (SERVICE ENGINE SOON telltale lamp) may be On with diagnostic trouble code (DTC) P0327 (Knock Sensor Circuit) present or stored in the powertrain control module (PCM) malfunction history.

Condition may be present because the initial DTC P0327 diagnostic calibration did not allow for normal build variation.

Install service PCM calibration if indicated in the following procedure.

1. Connect a Scan tool or the Service Stall System (SSS) to the vehicle and turn the Ignition On.

•	The Tech 2 displays the "Controller Part Number" parameter within the "Vehicle System Information" table.

•	The portable diagnostic tool (PDT) displays the "PCM Part #" parameter within the "Vehicle ID" table.

2. Refer to the table below and verify proper calibration.

•	If the controller/PCM part number does not match one of the numbers listed in the "New End Model" column below, then reprogram the PCM. (Refer to "Reprogramming EEPROM" in the "Service Stall System User Guide")

•	If the controller/PCM part number does match one of the numbers listed in the "New End Model" Column below, refer to DTC P0327 diagnostics in the 1998 - 1999 model year "Powertrain Controls Service Manual."

Important: Version 44.50 or greater Service Stall System (SSS) software is required for this re-calibration process. Verify the SSS is version 44.50 or greater.

If SSS version 44.50 or greater is not available, call the Saturn Customer Support Center at 1-800-7SATURN (1-800-772-8876), prompt 3. In Canada, call 1-800-828-6860 for English, or 1-800-503-3222 for French.

1. Use the Scan tool to verify complaint has been corrected by monitoring ESC PASS COUNTER for 20 seconds after engine start up.

To receive credit for this repair during the warranty coverage period, submit a claim through the Saturn Dealer System as follows: