My old E39 M5 had a maintenance mode accessible by pressing various buttons then you could read stuff like instantaneous fuel delivery in litres per hour etc on the dash, live, as you drove about.

Is there anything similar on the X350? That metric in particular was very useful to discover if the MAFs were working right since it was supposed to reach IIRC 130 just before the limiter.

Thanks in advance...

 

It supposedly does. There was a TSB issued for the X-Type, S-Type and X350 and they all used a similar procedure but I never got it to work on my '04 XJ8. A similar process works fine on my X150.

New XJ (up-to X358) Instrument Cluster Self-Diagnostic ETM

To place the cluster in ETM, perform the following:

1. Press and hold the stalk trip cycle button whilst turning the ignition from position 0 to position II, until 'ENGINEERING TEST MODE’ is displayed on the RH Message Centre display. The stalk trip cycle button must be released within three seconds of 'ENGINEERING TEST MODE’ being displayed or the instrument cluster will exit Self-Diagnostic mode.

2. To navigate forward through the instrument cluster Self-Diagnostic Mode tests, press the trip computer ‘MLS/KMS’ button.

3. To navigate backward through the instrument cluster Self-Diagnostic Mode tests, press the trip computer ‘A/B’ button.

4. To exit Self-Diagnostic Mode, press the stalk trip cycle button for more than three seconds.

5. The Self-Diagnostic Mode is also deactivated when the ignition switch is turned to the 'OFF' position, or low battery voltage is detected.

6. If the Self-Diagnostic Mode cannot be accessed repeat the above paying particular care to the sequence timing. NOTE: ETM is not available on X358. If ETM is not available use IDS/WDS to diagnose the instrument cluster.

You can do things like test the gauges, test the LED's, display fuel level, show the VIN, temperature as shown by the temperature gauge, battery voltage etc.

 

I'll see how I get on this weekend.

many thanks for taking the trouble to lay that all out.

SM

 

Cool info... had to bump

 

Thanks for the info!

 

I was told by my local Jaguar service tech that ETM was not available for MY 2006 and beyond. I tried it on my 2006 XJ8L and no joy. Maybe someone else will have better luck.