Green ENGINE FAULT, GEARBOX FAULT, STABILITY CONTROL FAIL all came on while driving normally. Red Check Engine warning also came on. Sport mode light went out. Idle speed shot up to 1,000rpm from 750. Faint smell from engine compartment was something I've never encountered before, assumed it was burnt transmission fluid. When shifting from D to N at a complete stop, idle speed shot up to 2,000rpm before settling down to 1,000. Having difficulty driving up ramp in carpark to reach 2nd floor. Seems like I've lost 1st gear.

Am I having the A-drum fault with this ZH 5HP24? Original transmission fluid was replaced a few months ago together with a new filter. How should I proceed to nail down the exact problem in this ZF with 80,000km or 50,000miles on the clock?

Thanks so much in advance.

 

Here are a couple of links to assist in deciphering codes, but recommend having an indie or transmission specialist look at to be certain


JagRepair.com - Jaguar Repair Information Resource


http://www.jagrepair.com/images/Auto...%201997-99.pdf


http://www.jagrepair.com/images/Auto...%201997-99.pdf

 

Thank you Steve for your kind advice, but I'm in Hong Kong which is a very small market, there are simply no transmission specialists around who have received ANY proper automatic transmission manufacturer factory training, be it ZF or BW or ...

My very competent indie who has serviced all my European drives for the past 25 years told me the cost to repair an auto transmission in Hong Kong is not viable because

1. there are no skilled techs around
2. the labor cost will be exorbitant
3. the necessary replacement parts are just not locally available/in stock

The simplest/cheapest/quickest solution would be for me to order a refurbished/used 5HP24 from the USA or UK and just swap it.

My question now is, Gentlemen, can you point me to the shops/sites where I can shop for a ZF 5HP24 ?

Also, I understand the BMW E38 and E39 (7 & 5 series of the same era) also specified the same ZF 5HP24 gearbox. Would they fit the Jaguar XK8 without any mods in terms of the transmission housing/mounting?

Thanks a lot in advance.

 

Just before I was going to buy a used transmission to replace my "broken" one, I did a final check to source the something burning odor from the engine compartment which I had assume to be coming from the transmission. Turned out it came from near the firewall. Took out the Engine Control Module and opened the top, lo and behold the smell came from a burned out capacitor. Had the ECM thoroughly checked for other component failure(s) and put it back in. All the errors remained and nothing has changed. The technician who fixed the ECM asked if the fuse for the throttle motor had been checked because the motor driving transistor had also blown. Indeed the 30-amp fuse for the throttle motor has blown. After replacing the fuse, all warning lights went away and things are back to normal!

The car will now intermittently show "STABILITY CONTROL FAILURE" and lit the amber warning lamp with code P1797; or it will show “GEARBOX FAULT" together with previous fault, also lit the red warning lamp with additional code of P1224. But if you while driving, shift to neutral, cut the ignition and restart the engine, all will go back to normal until the episode repeats itself at some random future time. I looked up the DTC summaries and it refers me to check CM PIN (Control Module Pin) GB2 -2 -6 for code P1797 (see attached picture). Can anyone advice which module is GB2 and where is it located at?




DTC P1797

 

I am not sure you have a transmission issue. When the throttlebody goes into fault you can and most of the time you will get a throttlebody, transmission, stability and your DTC codes or flags. I would check the throttlebody and the throttlebody plugs first then I would move on to the transmission.

Where did you get the OBDII code listing information from? This is the one I have for MY 1997

Link to 1997 xk8 http://jagrepair.com/images/AutoRepa...%201997-99.pdf


As for the transmission You also have a transmission control module TCM and that may have a problem as a result of your ECM trouble. Have you had it checked?

On the ZF transmission the your shifter linkage is on the left side of the trans mechanically it controls the shifter selector switch on the right side of the trans. That information goes to the transmission control module TCM that information is then directed to the engine control module ECM. The results are when you select “D” the TCM tells the ECM you are in “D” and as you accelerate the ECM and TCM work together to tell the trans valvebody when to shift. That brings us to the transmission control valve body.

The transmission valve body is the shifting of your transmission if one of the solenoids in the valvebody fail to operate properly you will see the flags and a code.

I would have the TCM checked and see what takes place.

 

Your car is a 1997 model, FAMOUS for ECM issues, and your description to what happened to yours, the smell, etc is your issue most likely. For your car ALL THE SUDDEN do all those errors, the odd rev'g etc. My 95 I had owned did the same thing. Went through 3 TB's thinking that was the issue. I said F'it the ECM has to be it, put my orig TB back on it, sent my ECM out to Auto ECU here in the states and they fixed it. Car has been running fine since (I know the current owner). I would send that ECM back out, I would bet that is your issue.
Many of us here have used them, and for other things then an ECM. I know you are not in the states but just a thought..... Automotive Scientific Inc. | Quality Rebuilt Automotive Electronics | Rogersville, TN

I would almost bet that is the issue. As I said the early years of this body style we have, specially the 97 has ECM issues that when it went made the car throw about every warning light the car had! Mine did EXACTLY what yours is doing, it is not the trans or anything else..

 

I tried to send a response earlier today but there were problems at yahoo. I agree with Tim, contact ASI. I hope you don't have customs problems sending parts out for repair.

 

Gus, I totally agree with you; my transmission runs beautifully when there are no ECM/TCM faults detected. After replacing the blown 30-amp throttle motor fuse, P1224 (throttle control position error) never re-appeared.

I don't remember from where did I pulled the OBDII code listing I posted; but it was for XK MY2003 rather than for my MY1997.

According to the code listing for DTC P1797, I'm having intermittent CAN ECM/TCM communication problem (CAN=Controller Area Network) when the two modules cannot talk to each other.

I'll definitely open up the TCM to find if it has suffered any damage due to the ECM blown components, when time allows. Right now I can tolerate a coasting engine re-start to clear all code(s) when they come up, which averages to twice per 15 mile journey.

I'm glad I did not buy a used transmission based on wrong fault assumptions.

I'll keep everybody posted on my progress to fix the remaining intermittent control module fault(s).

 

Brgjag: Thank you so much for your reply.

When I took out the ECM, I discovered it had a Auto ECU label stuck on the top cover, dating back to 2011, which means my ECM has been serviced by Auto ECU by previous owner(s) prior to my acquiring it in April 2013!!!

 

There is no customs problem when shipping to/from Hong Kong. Thank you for your concern.

My ECM has been serviced by ASI in 2011.

 

I would email them about it. If it was done while you owned it and maybe if it was a diff owner there should be a lifetime warranty I thought. I would certainly contact them via email and discuss it.

 

Warranty is for one year. If a local tech replaced a bad capacitor there may be other problems that he didn't find.
I think it's still worthwhile sending it to ASI, but they may not be willing to work on it if another hand has been there. At least they might test it which only cost $55 when I had mine rebuilt.

 

Hi brgjag:

I've already called ASI and their warranty only applies to the original owner of the ECM, which was one of the previous owner of my XK8.

 

Hi RJ237,

Your right; basic non-transferable warranty is for one year, unless you buy additional warranty up to lifetime for an extra $100.

I called ASI and asked them if they would check and/or work on a unit which has been touched by a third party, and they don't mind at all.