Hello All, 1997 Jaguar XJR with about 150K on it. Bought it second hand around christmas.

The Transmission Light with the X is on
The lights out bulb is on
and the Check Engine Light is on

I have purchased teh OBD11 reader and get these main codes -

P1775 Transmission System MIL Fault
P1791 TP (Electric) Circuit Malfunction
P13B0 Manufacturer Control
B30F4 Manufacturer Contro

Symptoms are that when warmed up it will Shift hard from 1st to 2nd or 2nd to third, seems to have lots of power and runs after i swapped new plugs without an issue.

What do you suggest i look at:?

Some thoughts are new TPS, new EGR and probably looking at the TPU to the Transmission Wiring?

Also, i would like to do a clean of the MAF, and throttle body, but the XJR with the supercharger makes it look like i need to pull a lot of parts off to get to the Throttle body, is that correct?

I am unable to find any videos of the Throttle Body clean with the Supercharger on?

Any help appreciated. Thanks.

 

You can clean the electrical connector on the transmission body , on the non-supercharged ZF transmission ( yours is a stronger General Motors ) there is a special way to remove the connector

On the very back of the valve cover there is a D cutout on the head that the shaped to fit valve cover gasket can fall out of place if not careful about the D cutout

You can run your finger along the valve cover rear edge to feel if the D cutout gasket section is in place

I think there are 2 D's

Your MAF body is a different version / part # then the non - supercharged

A non-modified factory supercharger / pulley setup should read about 225 grams / second flow rate at WOT

The reader device may have a software error where you would have to multiply the reading by a factor of 10 or 100 to make sense ( a Canadian company's patent copied by other manufactures without them testing their copy )

At the proper idle speed , you should read around 5 grams / second

 

The main fault I would address is the P1791 TPS DTC.
That might solve all your issues?

 

This is good stuff, i do feel like i need to repalce the tps and the cable, is there anyinstrucitons /video on how do to that, looks stright forward without the supercharger, but the SC seems to hide the throgttle body underneath a bunch of metal. Am I ok to start from the top and work my way down?

Thanks for the help.

 

To replace the existing TPS sensor opens up a lot of worms , but the idle is more of a common issue with the SC engine

There is some learning to do before committing to removing the existing TPS or even adjusting it

What I have learned is from the contributions of others on this forum

I developed a specific test points procedure for the X300 ( it is the common generic test for all car manufacture's ) and in the SC case to test it from the ECU connector

Fortunately this connector map and wire colors are the same for both SC and normally aspirated versions

 

See your proper idle speed on page 90 for the AJ16 SC engine and not the earlier years AJ6 included in this Doc , AJ16 starting on page 51

The ECU hardware is the same for the AJ16 SC and non - SC , just different maps

For a functional diagram see page 55 ( garage poster )

Yep , the V - 12 was made for your X300 series ( X305 ) , but are very few

801S TITLE (jagrepair.com)

 

A DVOM will be difficult to use for watching the TPS 'sweep' when 'Ohm-testing' the potentiometer.
I use an OLD moving-coil Ohm meter when I test potentiometes. I look for a 'SMOOTH' sweep when operating the TPS.

A common fault is an 'open' in the carbon track that causes the system to detect the open circuit fault and set the DTC.
Even a momentary open circuit will disrupt the ECM or TCM.

 

1997 CEL codes start on page 19 of the AJ16_ECM . pdf Doc Motorcarman ( Bob ) attached above

The 1997 CEL list is more refined than the 1995