Engine Control Module Reprogramming

WARNING: This page is about a different car, the 2003 Saturn Ion 3, 2003 Saturn Ion 2, and 2003 Saturn Ion 1. However, it is still accessible from the selected car via links, so may be relevant.

After replacing ECM or if program needs to be updated, refer to latest Techline information on ECM reprogramming. Before programming a ECM, the following must be observed, or ECM damage may occur:

The Tech 2 and terminal must have the latest software.
Vehicle battery must be fully charged. Battery voltage should be 12-14 volts.
The Tech 2 and terminal cable connections must be secure.
A battery charger must NOT be connected to the battery when programming ECM.

After reprogramming, perform and PROGRAMMING THEFT DETERRENT SYSTEM COMPONENTS .

To reprogram ECM, perform the Pass-Thru Programming. See SERVICE PROGRAMMING SYSTEM PASS-THRU PROCEDURE .