Dear RJ,

Just restarted her after 3-4 hours. Had to do a new hard reset again, worked perfectly.

Had a talk with a computer specialist. He says that the onboard has readable chips but also ROMs and that the ROM content cannot, per definition, be dumped and somehow. after some time,
influence the general ECU again. Dunno what to think now. It is quite unusual what happened,

 

That is unusual. I don't recall any other members reporting that issue. Except for the early AJ26 the ECU is pretty robust unless subjected to a voltage spike or reverse polarity jump start.

 

Hello again,

So, I did the second hard reset and now all seems to be in order, except that, in two days, I have to go back to he gearbox shop
so that they now can "fine tune" the mechanical connections between the gearshift lever(s) and the gearbox.
Kickdown has to be adjusted, gearshift is slow, etc.

Before, (when I stiil had that ATF leak) the amber engine / general fault light would come up and adding a liter of ATF cured that.

I stille have the amber engine symbol, so I added a liter of ATF.

I went for a 40-50 Km drive this morning, long straights, into the hills, lots of ups and downs and curves, all I could think of.

Amber engine light stays lit.

An answer, anyone ?

Thank you,

Takeo.

 

You need to read the codes. Plenty of cheap ones on the market, including smart phone apps and adapters.

 

Hello,

Two other codes were found that were not relevant at the time:

P1000 OBD SystemReadiness test not complete

P1647 Linear O2 Sensor control chip bank 1

Thanks,

Takeo.

 

I thought 1647 was bank 2. That needs to be replaced because the ECU is adjusting the fuel mixture to compensate. The P1000 will become P1111 when the emission system is functioning correctly.

 

Definitely must fix the fault. Car cannot run properly otherwise and will damage the cat conv.

 

I ordered two new ones from Moss. Hope I will get then by the end of the week or so.

 

Dear RJ237,

This is unbelievable.

This morning, 0700 Hrs, I drove my Jag back to the gearbox shop for final checking. I drove it about a 100 Km to Bordeaux on the N10 main road without any problems, only a slight delay in acceleration.
I drove at varying speeds between 70 and 130 Km/h, depending on traffic and speed limits.

Gearbox people took her for a spin and assured me all was pico bello OK, but I had my doubts, so the proposed me to take the car fo a spin again, the chief driving.

Started up perfectly, but as soon as he touched the accelerator pedal, BINGO ! same prob again.

I then did about 5-6 hard resets, but as soon as I even caressed the pedal, it went into engine failure mode.

We put it on their BOSCH test book and P1120 all over the screen again (+P1647)

Any Ideas ?

Thanks,
Takeo.

 

I don't know if that's a valid Jag code, but it may be a tps or tpi fault. Did you ever disconnect all of the throttle body connectors and clean them with electronic parts cleaner? You may have to replace the throttle body or have it rebuilt.

 

Go back and review the TPS that Bob forwarded. Then Google search and review the Robert DIY YouTube video on cleaning the TPS.

I still think there is a broken or bent wire in the TPS circuit.

 

I am a bit out of my wits now.

Here and there, I read all sorts of things going from a low battery (not even 1 year old, it reads 12.5 V after sitting a cay or so) to throttle cable adjustment (quite a job according to my 2500 page workshop manual) and also cleaning contacts.

Cleaning contacts sounds like a good idea, I got some very very good brake cleaning spray that will clean litterally everything on can think of.

Problem is distances here. she is sitting at the gearbox shop now, where she broke down yesterday (had to get home by train).

But the most puzzling of all is that she ran fine till that gearbox change. Even after the gearbox broke down, the accelerator still worked perfectly. Then I got a new gearbox in but P1121 at the gearbox shop.

After the first hard reset, I coud drive her, no problem. Drove her around here for a couple of days, no problems. Drove her to gearbox shop, she was taken for a spin and then broke down again with 1121 fault code. I do not see the relation.

Such a silly situation. Need to do some very hard thinking now.

Takeo.

 

Use electric contact cleaner, not brake cleaner.

 

I will defenitely get me a couple of cans of el. contact cleaner !

 

Dear RJ237 !

Here we go again!

I bought a ScanGauge and it helped me (almost), it clears some codes.

This morning I retrieved my Jag from the gearbox shop.

Drove it (almost) home. 100 Kms of freeway + some 20 Km on country roads with no problems at all except for slow acceleration and some funny
kickdown behaviour. When I use the kickdown, engine revs up but (NEW) gearbox is slow to respond, if at all in some cases.

When I got off the freeway, all the previous codes came sudenly back + some new ones like ASC and TRACK not available + Gearbox Fault.

It let me drive for a bit more and then, when hitting the brake pedal, it went into engine failsafe mode.

I resetted what I could, but the dashboard orange light with Gearbox Fault stays on.
After that I limped home, doing resets every time I hit the brakes or even just caress the brake pedal.

Now, at home, box in P, I can reset the codes but then the engine slows down first to its normal idle and then finally stalls
letting me read Engine Stalled on my dashboard.

Codes are P 1121, 1000, 1647, 1122.

I do not very well know what to think now.

Can you help me again ?

 

On the basis that these cars are extremely sensitive to voltage, have you checked the output from the alternator? I had the gear box fault message, plus a few spurious others iirc, not long before my alternator went completely.
Worth checking? I'm assuming your battery is fine.
Maybe log a trip with the voltage being recorded too?

 

Dear Chris-Jag,

I think that I am slowly losing my mind.

Last 3 days: I start my engine, get orange engine symbol, clear it with my scanner and drive off. This morning, I drove some 70 Km and, almost home, my dashboard lit up like a hristmas tree, including ASC fault, Trac not available, engine failsafe, gearbox fault, you name it.
Cleared what I could and had the same problem every time I decelerated. Warning lights on, I drove home, something like 500 meters by 500 meters.

Went shopping this afternoon with Katharina in our old Fiat Panda (that has more loading area in the back than our Jag).

I will now order a new O2 sensor and see if 1647 clears.

Hmmm .... my scanner keeps telling me that I have 3 faults "pending" 1121,1000, 1122 apart from the 1647.

I fear that those are "stored" faults that can be triggered even by my cell phone or just farting.

How does one clear "pending" faults and "stored" faults ?

I am now slowly reading the 2500 page workshop manual that is more difficult to understand than a woman.

In the end, I now think that is tis all just something silly, like a damaged earth wire, a loose connecting plug, oxydation, you name it.
Funny thing is that I never had any of those probs before I had my gearbox break down and had a new one installed.

BTW, Scanner reads 13.5 V on the battery and 14.5 V with engine running.

Or is it just "One Of Those Mondays" ? Malevolent spirits ? Gremlins ? A curse by the Prince Of Darkness ?

32 C in the shade here, now, in the South-West of France. I think I will have a cool Pastis right now.

Takeo.

 

You clear them by fixing the cause - they then self-clear.

Stop clearing them yourself.