Ok so i have an 97 4.0 auto and ive had issues with the obd port for years.... when u plug into it with a scanner or anything it has no power... my check engine light was on for a while and just relized its off... but it doesnt light up at all anymore... thinking the bulb may have gone out from being on so long... but the port is driving me crazy and i need to smog on jan 4th!!! Any ideas guys? I wanna give it a try before i take it to a shop...
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Obd2 issues on 97xj
- Thread starter Alboy97XJ
- Start date
90xj06
NAXJA Forum User
- Location
- Peabody, MA
make sure none of the pins got pushed in.
Sidewinder CC
NAXJA Forum User
- Location
- Canton, Michigan
Using a strong flashlight, and a magnifying glass (for old fools like me), examine the DLC. There are 16 pin socket positions but only 7 are occupied. On the top row, starting from your left: The first pin socket is #3, and the next is #4, which is chassis ground, next is #5, it is PCM Sensor ground. Both of the grounds (4&5) are at the oil dipstick tube attach point.
On the bottom row, the last pin socket on the far right is #16; this is 12 VDC from fuse #17 in the PDC. This powers the scanner and pin socket #4 is the ground for the scanner.
Note: Fuse #17 in the PDC, also powers the headlamp switch.
After not being used for years, my pin socket #16 got corroded and wouldn't power my scanner. I cleaned mine using CRC Electronic Cleaner and got it to work.
Test for power at pin socket #16. Turn key to RUN (engine off). Using a Voltmeter, touch pin socket #16 with the meter + probe and pin socket #4 with the meter - probe, you should get battery voltage (12 VDC). Repeat with - probe at pin socket #5. Again, you should get battery voltage. Do not shove the meter probe into the pin socket, it will enlarge the socket to the point that the scanner pin won't make contact (which could be an existing problem).
If you don't get 12 VDC, examine the grounds at the oil dipstick tube for security and corrosion. Rectify as required.
rstarch345
NAXJA Forum User
- Location
- Where ever I can wheel
Look like you found your problems. Kudos
Sidewinder CC
NAXJA Forum User
- Location
- Canton, Michigan
Before nuking the dash...
Does the CHECK ENGINE advisory light illumnate when you turn the key to RUN (before starting engine)?
Sidewinder CC
NAXJA Forum User
- Location
- Canton, Michigan
No power to 4 and 5 so checking ground... found tape on a white with black stripe wire... took tape off to find this...
The White/Black tracer wire is the CCD Data Bus (-) wire to the DLC, that Violet/Brown tracer wire is the (+) CCD Data Bus wire to the DLC.
Make sure that butchered connection is secure and free from corrosion. Resolder it if required and cover with shrink tube.
If there's a Pink wire in that mess, it's the PCM SCI transmit wire to the DLC, and if there's a Light Green/Black wire it's the PCM SCI receive wire to the DLC. Both wires need to be there (meaning securely attached at the DLC and free from corrosion) inorder for the scanner to communicate with the PCM. SCI means Serial Communications Interface.
Hope you polished that DLC ground terminal end and the mount stud real good before assembly.
DLC Pinout
_____________________
X X 3 4 5 6 7 X
X X 11 X X X X 16
________________________
3 - CCD (+)
4 - Grd
5 - Grd
6 - SCI Receive
7 - SCI Transmit
11 - CCD (-)
16 - Fused B+
Make sure all the pin sockets in the DLC are not corroded (black or green appearance) and that the pin sockets haven't been enlarged. Check the back of the DLC where the wires enter for corrosion as well.
Sidewinder CC
NAXJA Forum User
- Location
- Canton, Michigan
So what?
Ok replaced o2 sensor, cel bulb and speed sensor.... had battery disconnected for a few hours and just started jeep and cel is on... scanned it and 443 and the 1492 was still on.... took my scanner and tried to delete them but the light wouldnt go out and rescanned it and both codes still showed up....
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