For 1990-2009 cars

# Engine Exhibits a Rough idle After a Cold Start With No DTCs Set

Subject: | Engine Exhibits a Rough Idle After a Cold Start With No DTCs Set (Install New ECM Calibration, if Required)

Models: | 2000 - 2001 Saturn L- Series vehicles equipped with L81 (V6) engines

### Condition

Some customers may comment about the engine running rough at idle after a cold engine start in ambient temperatures between 10° - 30° C (50° - 85° F). When this condition occurs, no DTCs will be set an stored by the ECM.

### Cause

A combination of low volatility fuels and ambient temperatures between 10° - 30° C (50°-85° F) may result in an air/fuel mixture that is too lean.

### Correction

The new calibration for the engine control module (ECM) can richen the fuel mixture after engine start if a rough idle is detected. Reprogram the ECM with the service ECM Calibration detailed in this bulletin. (Refer to "Service Programming System" in the Saturn Service Stall System (SSS)/Tech 2 User Guide for reprogramming procedures.)

### Procedure

Important: during reprogramming, the SSS will only display the Calibration Package ID. This number may be the same for the current ECM calibration and the new service calibration detailed in this bulletin. Therefore, the Tech 2 must be used to differentiate between the different ECM calibrations.

1. Connect a Tech 2 to the vehicle.
2. Navigate to the 3.0 Liter POWERTRAIN menu.
3. Select ID INFORMATION.
4. Select ENGINE INFORMATION.
5. Read ECM CALIBRATION.

On 2000 model year vehicles:

• | If ECM calibration is 0210601, 02610602, 02620101, or 02620102 reprogram the ECM with the latest 2000 model year calibration available on the Saturn Service Stall System Stall System (SSS). (Refer to "Service Programming System [SPS] in the Saturn Service Stall System [SSS]/Tech 2 User Guide for reprogramming procedures.) This calibration can be found on software CD version 7.0 and higher for reprogramming procedures.) This calibration can be found on software CD version 7.0 and higher.

• | If ECM calibration is not 0210601, 02610602, 02620101, or 02620102 do not reprogram the CM because the ECM already has a calibration installed to address this condition. Refer to additional diagnostic information in the 2000 L-Series L81 Engine Service Manual.

On 2001 model year vehicles: IF ECM calibration is not 02630102 do not reprogram the ECM because the ECM already has a calibration installed to address this condition. Refer to additional diagnostic information in the 2001 L-Series L81 Engine Service Manual.

### Claim

To receive credit for this repair during the warranty coverage period, submit a claim through the Saturn Dealer System for J6355 (EE PROM-Reprogramming), or if another procedure is performed, refer to the appropriate Electronic Labor Time Guide for the correct Labor Operation Code and Time. When another procedure is performed that requires EE PROM Reprogramming. J6355 must be claimed as a "Related Line" to that repair.