Equus 3123 - GM Code Reader (1982 - 1995) - Manual (Page 11)

Retrieving ECM Codes
GM 2-2
* Not applicable to models equipped with climate control
computers
NOTE: For 1994 and 1995 vehicles, only the models listed
above are compatible with the Code Reader.
The Code Reader is not compatible with 1996 and
later model year vehicles.
2.1.1 Vehicle Test Connector
GM and Saturn vehicles use one of two types of test
connectors: 12-pin or 16-pin.
■ 12-Pin Connector: The 12-pin
connector was phased out
completely in 1996. Some 1994
and 1995 vehicles still use the
12-pin connector, but because of changes in the ECM, the
Code Reader is not compatible with some of these systems
(see paragraph 2.1).
■ 16-Pin Connector: The new
16-pin connector was introduced
on some 1994 and 1995 models,
and was made standard
equipment on all 1996 and
subsequent model year vehicles. The Code Reader will
not work on vehicles equipped with the 16-pin
connector.
2.2 BEFORE YOU BEGIN
• Fix any known mechanical problems before performing
any test.
Make a thorough check before starting any test procedure.
Loose or damaged hoses, wiring, or electrical connectors are
often responsible for poor engine performance, and in some
cases they may cause a “false” fault code.
Model
Year
Make Model
1995 Chevrolet Caprice 4.3 liter
Saturn All models
Trucks All one ton capacity or less with gas
and Vans engines (EXCEPT S/T Series vehicles)
1 2 3 4 5 6 7 8
9 10111213141516