Why on my 1995 GMC Jimmy do I not get any communication or check light to my scanner
#1
12-16-2017, 11:21 PM
Why on my 1995 GMC Jimmy do I not get any communication or check light to my scanner
I just want to know why hi my 1995 GMC Jimmy can I plug in my scan tool and I've got power to it but it's not communicating it is a 16 can it's an OBD2 and I haven't had an engine check light on for quite some time it won't even come on when it is key to the on position
#2
12-16-2017, 11:59 PM
I just want to know why hi my 1995 GMC Jimmy can I plug in my scan tool and I've got power to it but it's not communicating it is a 16 can it's an OBD2 and I haven't had an engine check light on for quite some time it won't even come on when it is key to the on position
#3
12-19-2017, 06:58 AM
it is a 16 pin it's an OBD2
Found this when I double checked the pins to jumper on another forum.
I found a special note relating to 1995 GM vehicles. The move to OBD-II standardization started in 1994, GM started phasing it in during 1995. However, those 1995 vehicles came in different flavors depending on the vehicle and what part of 1995 it was manufactured.
There are at least groups of 1995 vehicles which have a non-standard 16-pin connector.
The first group of vehicles still contain an ECM, rather than a PCM, and thus still report codes via flashing the MIL/SES light. The 16-pin connector is not a DTC connector, but is rather a modified ALDL connector. (The 1995 S-10 is the example used in the manual.) These vehicles are NOT OBD-II complient and will not work with OBD-II scanners.
The pin out of the 16-pin connector for these vehicles looks something like this:
_______________________
\ X X X 4 5 6 X X /
`\9 X X 12 X X X 16/
``------------====-------------
Where: X denotes pins that are unused.
Short 5 (ground) and 6 (test) to recieve ECM error codes via the SES indicator.
The IMPORTANT thing to know about this group of vehicles, is that you can still get the old style error codes from a blinking Service Engine Soon light. To do so, you short pins 5 and 6 on the above diagram.
There are at least groups of 1995 vehicles which have a non-standard 16-pin connector.
The first group of vehicles still contain an ECM, rather than a PCM, and thus still report codes via flashing the MIL/SES light. The 16-pin connector is not a DTC connector, but is rather a modified ALDL connector. (The 1995 S-10 is the example used in the manual.) These vehicles are NOT OBD-II complient and will not work with OBD-II scanners.
The pin out of the 16-pin connector for these vehicles looks something like this:
_______________________
\ X X X 4 5 6 X X /
`\9 X X 12 X X X 16/
``------------====-------------
Where: X denotes pins that are unused.
Short 5 (ground) and 6 (test) to recieve ECM error codes via the SES indicator.
The IMPORTANT thing to know about this group of vehicles, is that you can still get the old style error codes from a blinking Service Engine Soon light. To do so, you short pins 5 and 6 on the above diagram.
Last edited by oldeerslayer; 12-19-2017 at 07:54 AM.
#4
05-15-2021, 11:41 AM
Just got my Actron Elite AutoScanner CP9690, and it does indeed work with my 1995 GMC jimmy.
Reads codes and shows real time engine data.
Reads codes and shows real time engine data.
#5
05-15-2021, 11:56 AM
As a point of clarification about the CP9690 and my Jimmy, other scanners with the OBD II connector (specifically the INNOVA 3170RS, and an older Actron) would not link or show any information.
So, I believe I have an OBD I computer, but no pin 6 on the port for the (pin 5 and 6) jumper wire method that would show flashes to count for trouble codes.
So, I believe I have an OBD I computer, but no pin 6 on the port for the (pin 5 and 6) jumper wire method that would show flashes to count for trouble codes.
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