Engine Control Module Reprogramming

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 .