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Re: D.I.Y OBD download terminals to jump to use check...
OBD 2 (96-2008) does not have that capability, older systems did up to the 1995 model year. You can buy a tester that does just codes on ebay for less than $40.00, live data stream testers are about double that.
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If it is a Tercel or MR2, it is T and E1 terminals. Code 21 is main oxygen sensor signal fault. Code 51 is A/C signal on; DL contact off (in transmission shifter with diagnostic connector jumped). I have no idea what that 51 means.
You will still have an OBD I system and will be able to retrieve codes by jumping the "A" and "B" terminals in the data connector. Turn the key to the "on" position and you should be able to count the flashed on the engine light itself.
The jumper goes into A & B, usually the top right two terminals. But check, in those years, GM was transitioning over to OBD-II, and they had some hybrid connectors that didn't match OBD-1 connectors. Leave it to GM for oddballing.
fuse number 24 is a 30 amp fuse goes to pcm relay and fuse number 30 the 30 amp fuse to ignition to pcm power diode.if check light is working your pcm has power but you could have short in the dlc connector terminal where you scanner adapter goes.your scanner suppose power up from the dlc terminal for obd 2 system the obd 1 you connect to cigarette light or use battery hook up cables that come with scanner make sure you are using correct adapter.
1995 was a change over year some of the cars had obd I connectors and some had the obd II as far as i know you will need some type of code reader if you have the new style connector even though the system is still obd I commiucation . If it is the old style connnector you can jump it with a paper clip and read the codes from the flashing engine light , Just so you know you can have your car scaned for codes from most local parts stores for free.. but do not think this is a diagnose of the problem and let them just sell you a part .
On some 1995 OBD 1 models with a 12-pin Data Link Connector, trouble codes can be accessed by connecting terminal B to terminal A with a jumper wire. With the key in on position, the codes can be read by watching the "service engine soon" light. HOWEVER, some models have a 16-pin DLC and you have to jump terminals 5 and 6 to get the trouble codes to flash.
Ok, on an OBD 1 system you can read you codes by using a paperclip and jumping terminal a and b. The OBD port should be a large black plastic connector with 12 openings for wire leads. Not all of them have terminals inside in most cases. It should be at the bottom of the dash trim in the drivers side foot well. Terminal A is the upper far right terminal. Terminal B is directly beside it. After the paperclip or short piece of wire is inserted in those terminals turn the key to the on position but DON'T start the car. The check engine light will flash. 1 long flash, 2 short flashes. This let's you know the system is functioning. It should do that three times and then give any stored codes. Example 3 long flashes followed by 7 short flashes is a code 37. Have a pen and paper handy to jot the codes down. If you think you missed anything switch the key off and back on. In most cases a quick google search of example 1988 Subaru DL code 37 will net you results.
Hope this helps and good luck.
If you have the ALDL connector it will be under the dash on the drivers side. I am not so sure VW used this connection. If you do have it though you can jump out the 2 terminals on the right upper side of the connector to pull up trouble codes. Count the check engine light flashes for the codes.
flash----flashflash is 12 and flashflash------flashflashflash is 23 watch it close so you don't miss a flash!!!