Corvette V8-5.7L VIN G (1997)
Engine Control Module: All Technical Service Bulletins
Engine Controls - PCM Reprogramming/Data line Diagnosis
Bulletin No.: 02-06-04-022A
Date: October 13, 2003
INFORMATION
Subject:
PCM Reprogramming and Data Line Diagnosis Using J 42236-A
Models:
1997-2004 Chevrolet Corvette
Supercede:
This bulletin is being revised to add the 2004 model year. Please discard Corporate Bulletin Number 02-06-04-022 (Section 06 - Engine/Propulsion
System).
All 1997-2004 Chevrolet Corvette models are equipped with two Class II data line splice packs (also called star connectors). Essential tool J 42236-A is
designed to connect to these splice packs and is required for PCM reprogramming and data line diagnosis.
The J 42236-A allows the technician to isolate one module at a time from all others on the Class II data line. When a module is isolated, the Tech 2 can
be used to read data, send commands and reprogram that module (if applicable).
When reprogramming the PCM, the on-board control modules may attempt to communicate with the PCM across the Class II data link. When this
happens, the reprogramming procedure is interrupted and will result in a non-functional PCM and require replacement of the PCM. When
reprogramming the PCM, the service method listed in Service Information (SI) must be used to ensure that no other modules in the vehicle attempt to
communicate with the PCM during the reprogramming procedure.
Important:
Before installing the J 42236-A for diagnosis or reprogramming, check and record all stored DTCs.
^
J 42236-A installs to the splice pack/star connectors. These splice packs are located to the left of the body control module (BCM). The splice
packs/star connectors are stand alone and do not plug into the BCM.
The BCM is located behind the passenger floor access panel.
^
Both splice pack/star connector shorting bars need to be removed from the splice pack/star connector. This can be done by squeezing both ends
of the shorting bar and pulling it away from the splice pack.
^
The splice packs/star connectors may have to be removed from their mounting pins in order to install the J 42236-A. The splice packs/star
connectors must be visually inspected to ensure the proper cable from the J 42236-A is installed on the correct splice pack/star connector.
^
Cable # 1 connects to the star connector with eight, nine or ten wires. Cable # 2 connects to the star connector with four incoming wires.
