Engine Control - 2-Board Electronic Control Module Usage
90chevy06Subject: 2-BOARD ELECTRONIC CONTROL MODULE USAGE - 2.5L EFI ENGINE
NUMBER: 82-I-96
SECTION: VIM
DATE: July, 1982
2-BOARD PROM PART-NUMBERS:
3-BOARD PROM PART NUMBERS:
Recently a new design Electronic Control Module (ECM) has been introduced into production. This new ECM is referred to as a 2-board ECM versus the first design (3-board).
This new ECM was introduced on later built Citation and Celebrity models equipped with the 2.5L EFI L4 engine.
The most significant difference is size. The new ECM is narrower than the first design (3-board) ECM. A vehicle equipped with a 2-board ECM should not be serviced with a 3-board ECM.
Included in this bulletin is a list of PROM part numbers and their usage. Some of this information is not found in the parts catalog and should be used for reference.
Service part number for the 2-board (second desiqn) ECM is 1225610. The service part number for the 3-board (first (design) ECM is 1225570.