Hi ! I have a problem. I have found in manual that this model has OBD. But can not understand where I can plug in cable. Or maybe I can use only onboard computer. And try to understand the errors on panel. So if somebody can help me to share photo where to find the port to plug it's will be nice.




And one more I can not understand why I have such VIN number , it's look like it's not from this car.

 

There is no OBD port on a 1990 XJ40. You view the codes using the VCM button.

On the next page of the Haynes manual that you have you will find the info you are looking for, ie

Obtaining fault code output

3 To obtain an output of diagnostic codes,

verify first that the battery voltage is above 11

volts, the throttle is fully closed, the

transmission is in Park, the accessory

switches are off and the engine is at normal

operating temperature.

4 Turn the ignition switch to ON but don’t

start the engine (Position II). Note: On 1988

and 1989 models, remember to turn the

ignition switch to position II without turning

the key to OFF.

5 Press the VCM button on the display panel

(see illustration) and observe the LED display

on the dash for the designated codes. An

asterisk next to the code indicates that there

are multiple codes stored.

6 The numerical values will be displayed on

the trip computer display on the dashboard.

7 If there are any malfunctions in the system,

the corresponding fault codes are displayed in

numerical order, lowest to highest.


On your VIN number....... SAJ is Jaguar....... thats good...... the problem is the next character, which is "J" According to the VIN decoder I have, The only way you can get a "J" here is if you have a car that is 2000 or newer........ if your car really is a 1990, then something is way wrong with the VIN. The 4th Character on a 1990 XJ40 Sovereign should be "H" I didn't go any further down the path as there is obviously something majorly wrong here.

 

The VIN with SAJJHA.... seems normal.

MFR : SAJ Jaguar
MARQUE : J Jaguar [Daimlers have a D here]
MODEL : H XJ40 Sovereign
TRIM CLASS : A Baseline
BODY : L 4 Door Saloon
ENGINE : D 4.0L
TRANSMISSION : 4 Auto LHD
YEAR : A Series 1
EMMISION: K
SERIAL : 598739

See below

 

As to the VIN oddness.....

It'll almost certainly come down to most VIN decoders being set up to read USA/North American VINs. VINs for other markets were often in a different language, so to speak. My guess is that the OP has a non-USA car

Cheers
DD

 

The OBD port is near the Battery. It is a round connector not mounted, just dangling on wiring. The later cars (1993/94) have the battery mounted in the boot and the OBD port is mounted on the battery support bracket.

The port won't do you any good unless you have a PDU (Portable Diagnostic Unit) and the proper CD software.

The only modules you can communicate with are the ECM, TCM and the ABS.

bob gauff

 

Real Sinner,

Our U.S. spec 1993 XJ6 Vanden Plas VIN begins with SAJ, so your VIN is just fine. A lot of the online VIN decoders are flawed.

As has already been confirmed, your car is equipped with On Board Diagnostics, but it's OBDI, which cannot be accessed with a standard OBDII/CAN scanner. A proprietary Jaguar system is required (the Portable Diagnostic Unit that Bob mentioned).

However, as Sarc described, you can read stored Diagnostic Trouble Codes using the built-in VCM (Vehicle Condition Monitor). The codes will show up in the form of "Fuel Fault 69," or "FF89," etc. The Haynes manual has a list of all the codes for the various model year ranges.

Cheers,

Don