Mick Howes
CCCUK Member
Can an OBD2 be used for a 95 LT1? I have been told has to a '1' but I cannot find an OBD1 to buy anywhere.
OBD1 or 2?
- Thread starter Mick Howes
- Start date
teamzr1
Supporting vendor
Hi Mick
EPA here in the USA required OBD-II starting in 1996
GM began preparing for this and used the 1994 & 95 Corvettes as testpigs
They still are OBD-I, but GM switched from an ECM controller which used an E-prom where the calibration is stored
the PCM stores the calibration in flash memory.
Where OBD-1 uses a 12 ping diag connector, the 94-95 C4 uses the 16 ping connector that OBD-II requires
This means the scanner has to be for OBD-I but uses a 16 pin diag connector
Here is a OBD-I scanner, I have used this for many years
You need a laptop using MS Windows and has at least 1 USB port free
This allows to see and clear error codes, scan engine and auto tranny functions
Put scanner in record mode and can drive while scanner keeps recording
You can select what PIDs (parameters) you want to scan or record
Those recordings are saved to hard drive as files and can be played back at any time
Also, can export the recordings to a text file and then imported to like Excel to analyzed further
Recordings can be emailed to others who also have the same scanner, and they then also can replay or analyze
This OBD-I only scanner is called "Datacat" and bought at TunerCat
On the left side of that page, select Datacat
Towards the end of that page if you only want this for your C4 that uses 16 pin connector so
select the USB/ALDL-2 (16 pin ALDL) cable
If wanting to use on many other GM OBD-I vehicle, notice they sell a y cable which has both the 12 and 16 pin connectors
Cost shows for the scanner software & hardware interface/cable of $135, and they charge another $30 for shipping outside the USA
On that Datacat webpage you can see all the OBD-I GM vehicles you can use this scanner on
So again 94-95 C4s are OBD-I BUT using the OBD-II 16 pin ADLC (diag port)
EPA here in the USA required OBD-II starting in 1996
GM began preparing for this and used the 1994 & 95 Corvettes as testpigs
They still are OBD-I, but GM switched from an ECM controller which used an E-prom where the calibration is stored
the PCM stores the calibration in flash memory.
Where OBD-1 uses a 12 ping diag connector, the 94-95 C4 uses the 16 ping connector that OBD-II requires
This means the scanner has to be for OBD-I but uses a 16 pin diag connector
Here is a OBD-I scanner, I have used this for many years
You need a laptop using MS Windows and has at least 1 USB port free
This allows to see and clear error codes, scan engine and auto tranny functions
Put scanner in record mode and can drive while scanner keeps recording
You can select what PIDs (parameters) you want to scan or record
Those recordings are saved to hard drive as files and can be played back at any time
Also, can export the recordings to a text file and then imported to like Excel to analyzed further
Recordings can be emailed to others who also have the same scanner, and they then also can replay or analyze
This OBD-I only scanner is called "Datacat" and bought at TunerCat
On the left side of that page, select Datacat
Towards the end of that page if you only want this for your C4 that uses 16 pin connector so
select the USB/ALDL-2 (16 pin ALDL) cable
If wanting to use on many other GM OBD-I vehicle, notice they sell a y cable which has both the 12 and 16 pin connectors
Cost shows for the scanner software & hardware interface/cable of $135, and they charge another $30 for shipping outside the USA
On that Datacat webpage you can see all the OBD-I GM vehicles you can use this scanner on
So again 94-95 C4s are OBD-I BUT using the OBD-II 16 pin ADLC (diag port)
Last edited:
Steven Smith
CCCUK Member
I have been looking for something similar for my 86 and have found the following sites:
obd2allinone.com
There is also lots of free software to allow you to look at the data.
OBD Diagnostics, Inc. - OBD2 All-In-One Scan Tool w/ USB
The OBD2allinone pc scan tool to turn off the check engine light on OBD2 cars and trucks is made and sold by OBD Diagnostics Inc. Our automotive diagnostic tools can read and log any obd check engine code data.
There is also lots of free software to allow you to look at the data.