When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have a 1994 Jaguar XJS and the transmission is currently in fail/safe mode. The alternator was recently replaced and I'm guessing it has something to do with that. Nevertheless, the transmission specialist I brought the car to said he can't read the computer codes on the 1994 model because it doesn't accept the OBDII scanner. Can any help and recommend how I can read the codes?
If you do a little reading on the forum, you'll find out how to get the codes to display on the clock screen.
Thanks
The only thing that I read was that if you leave the ingition in the on position with the engine turned off, it should work. If you can share a link or provide additional info , it would be appreciated. Thanks !
Early '94's are an OBD1 system, so nothing to scan. The fault codes appear on the clock screen when the ignition switch is turned to "on" position. I f you disconnect the battery ground cable and wait @30 seconds, then turn the ignition back on, you will see FFcodes. However, I don't recall there is a FFcode for the trans limp-home mode. Failure of this type is commonly a fault of the TPS, or the TPS wiring. I've had recent experience with the TPS wiring causing a tranny fault and found the TPS thick with oil, as well as the wire harness. A thorough cleaning of all and a length of plastic, corrugated tubing that is split to slide it onto a harness cured the issue after reconnecting the battery ground cable. You may have to replace the TPS which ain't cheap (Moss Motors $235) and tough to remove unless you take the throttle body assy off. Good luck!
Dave in AZ
It is possible to read the ABS and TCM in a 94 XJS using the old WDS or IDS dealer tool (or Genrad GDS-5xx), but you will need an adaptor cable to plug into the diagnostic socket.
You read the car using the 95/96 XJS protocol, as the ABS & TCM modules are the same as the 94.
Alternatively tapping the Orange wire of the '94 diagnostic connector to pin 7 of the DLC cable of the WDS/IDS/GDS will also work, but then you need to sort out power connections separately.
...You may have to replace the TPS which ain't cheap (Moss Motors $235) and tough to remove unless you take the throttle body assy off. Good luck!
Dave in AZ
I believe the two screws securing it are 5.5mm. I scared the dog with my foul language while removing/replacing mine. Good luck indeed!
The only thing that I read was that if you leave the ingition in the on position with the engine turned off, it should work. If you can share a link or provide additional info , it would be appreciated. Thanks !
09-11-2021, 10:21 AM
OBD Scanner Help!! 94 Jag XJS
