I tried connecting 2 different obd2 readers to the port and both indicate that they cannot access the on board computer to retreive the error codes. Could this be a blown fuse? The cig liter works. Is it possible to get these codes from the dash screen? This car has been serviced only at the dealership, thruout its life, so they must have been able to read the codes. At one time the car had a remote starter connected, could this have messed it up?
The car is lacking power at speed (after the engine light comes on) while on the highway at 50mph for a short period. If I back off the throttle, I can get response up to 40mph, but if I depress the pedal further, it bogs out. Eventually the power comes back a bit and I can run the car but if it down shifts in passing gear, no power again. Now it is begining to skip at idle, sometimes. When I begin moving from a stop, it shudders a bit. This problem has become progressively worse over time, Thanks for your help.
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OBD2 Stands for On Board Diagnostic Version 2
CANBUS means Control Area Network Bus
CANBUS is a communications protocol that allows devices and computers in a modern car to communicate with each other. It allows modern vehicles to have such functions as increasing the volume of the stereo as you speed up and slowing down the windscreen wipers when the car stops.
OBD2 is a standard for fault reporting and transmitting real time data on how an engine is behaving to an external device connected to the diagnostic port in your car. This may be a handheld OBD code reader device or a laptop equipped with suitable diagnostic software.
If you had a CANBUS capable OBD device connected to your car's diagnostic port then it would use the CANBUS protocol to exchange data with your cars on board computer systems.
With some devices this can be a 2 way exchange and can allow you to upload new engine software for better performance and program some of the other functions of the car like whether the central locking unlocks the drivers door or all the doors on the first click of the remote or requires two clicks to unlock all the doors.
Okay, what you may have on your hands here is what has become known as an obd1.5 computer setup. Some of the 94's and 95's were made in anticipation of the switch to the obd2 set up. To determine if you fall in to this category locate your vehicle's computer. If it is under your hood in the engine compartment and you have two oxygen sensors and the port for your scanner fits an obd2 scanner then you have an obd2 system and your inability to link is either an electrical issue or something wrong with the computer itself.
If the computer is not in the engine compartment, you have one oxygen sensor, and the port for your scanner is rectangular you have an obd1 system.
If your computer is not in the engine compartment, you have one oxygen sensor and you have an obd2 scanner port you have an obd1.5.
Obd1 systems can be checked with an obd1 reader or much more easily with a paper clip or jumper wire. Just google something to effect of obd1 paper clip method. If there is still no communication once again you more than likely have an issue with your computer or electrical system.
If you have a true obd1.5 system do not fret there is still hope :) Yes there are some obd2 scanners that will work on these and there are some reportedly fancy obd1.5 code readers, however the easiest (and least expensive) way to pull the codes from this system is to use a modified version of the paper clip method. Instead of using your paper clip or jumper wires on terminals A&B, jump terminals 5&6.
Look at your scanner port. Count the terminals on the top row starting from the left. There should be connections in terminals 4, 5, and 6. Connect the jumper to terminals 5 and 6 and turn the key to the 'on' position (without turning the engine over). Your check engine light will flash. Each code will be two digits long and will flash three times (sort of like morse code). The first one will be a 1 and a 2, thus code 12. This code can be overlooked as it is just stating that the computer is being jumped. The codes that follow are the ones you should take note of.
These two digit codes correspond to the two digit obd1 codes. You can find their definitions on any number of websites. I personally prefer the haynes troublecode book though as it includes some make specific information.
Most obd2 connection ports are under the driver side dash and can be visible without removing any panels. On some chrysler Daimler vehicles you do have to remove a panel to access this service port. If its not located under the dash then it will be located under the hood on the driver side and be capped off and labeled obd2 scan tool service. Simply plug your wire in with the key on and the engine not running and read the codes from your vehicles on board computer/ecm/bcm. Hope this helps. Good luck.
1995 is OBD 1. Saab became OBD 2 compliant in 1996. The error message may represent a communication problem between the device and the on board electonics, although this most often is manifested by failure of the reader to provide any message. Check your diagnostic port on the back side where the wires enter it. You will need to remove the two screws that secure it to the underside of the lower dash panel beneath the steering wheel to do this. Make sure that none of the pins have been pushed through the back side or have been loosened within the port. If it looks suspicious, try holding the wires securely into the port when connecting to the scanner. It may help to have an assistant who can experiment with various positions pushing against the backs of the pins while you try to get a secure connection. If this is not the problem, the scanner you purchased my employ the wrong communication standard for Saab cars, which is ISO 9141. There are three others out there in common use.