I'm not getting a signal from my passenger side Oxygen sensor (the upstream one - of course) Wiring appears to be okay w/ no shorts, etc.
Can't access fuel trim on scanner.

Does the STR have more than the chassis control module and the body control module ? Is the engine control module same as chassis control module ?

Whichever module controls the oxygen sensors is the one I need.

I'm wanting to buy a good used one. Please PM me with info.

Thanks

 

the oxygen sensors feed directly into the ecm. ecm is located under the dash on the passenger side. the only way to get to the connectors is to pull off the wiper cowl and pollen filter components under the hood. then to remove the ecm you have to pull it out from under the dash. we almost never replace the ecm. just some food for thought.

 

All the O2s are wired into the PCM (Powertrain CM, CM=control module) aka ECM (Engine CM).
Roughly appropriate circuit diagram is in JTIS (in a PDF) and you want fig 03.5 at about page 59.

99.9% it'll be a faulty sensor, wiring or connector. I suppose a PCM can fail but the Densos used on the STR really are tough.

The upstreams are wide-band aka linear aka AFR sensors, unlike the downstreams.
I understand they're also Denso parts but Napa apparently stock an equivalent.

There are no modules normally known as "chassis" or "body" on the STR and I'd prefer not to guess which ones would be approximate equivalents. (There are 5 or 10 which as a collection do those functions.)

Do you have access to an OBD tool which can read the data (from the PCM) and graph waveforms from an O2 sensor?

You should have roughly the same graphs for left & right sensors. Blipping the throttle is useful to see them move.

But..... first check both banks are running CL (closed loop) otherwise report back!

Fuel trims give useful data, too (no need to graph unless it's easy). I'm puzzled why you can't access the trims. Crappy scanner?
(An elm327 will read them.)

Ahh.... just noticed the "PM" request. Sorry. Ever-full mailbox makes that inconvenient.

 

ttwotees:
Glad to see you back!!! Hope you can post the entire story when your done.
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Both Oxygen sensors are brand new Denso OEM models. Still doesn't signal, so we are
suspecting the ECM. We are going to try re-flashing.

 

It's not pretty, but Thanks. I now know most everything about removing the engine
and replacing it. (ugh)

 

Swap the 02's side to side to verify,,,new=never ever worked

 

ttwotees - tell us more about the O2s and especially the OBD tool. It's more likely the tool than both O2s. Or maybe something suppressing their readings. Or they're not getting power (looks like two 30A fuses F20 & F35 -- O2s need to be HOT). Or.... well, more data please! Er, also why are both new?

You have a 2004 STR like me - right?

 

Side note, how`s the power coming from the work that you had done on the supercharger? Last time you posted, you weren`t happy...

 

ttwotees:
Here is a picture of the modules and their location.
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Thanks Brutal; That's the first thing we did. However, my mechanic called late this
evening and said he pulled the wiring harness out farther than before and found two
wiring connectors (to the ECM I assume) broken and that's probably what happend
to make the engine run rough. He thinks he will have it ready next Tuesday so thanks
for all of you helpful comments.

 

JagV8- Yes you're right. We tried swapping the O2 sensors and one side wouldn't work with either one, so I decided to throw some $ at the problem, knowing that
new O2 sensors woiuld also improve operational efficiency and Yes I have an '04
STR with a brand new Jaguar remanufactured engine. I'm embarrassed to say so,
but I accidentally ran the original engine low on water and burned #6 & #8 pistons
even before I was able to give the blower porting a good test. I've been out of
commission for 3 months.

 

Thanks Club Airth for the photo. I've made a copy for myself. Enthusiast, Now you
know why I haven't posted any performance figures. As soon as I get my crate
running properly, I'll have some tests performed.

 

Aww, sorry to hear about the engine trouble!
Let's hope the damaged wires explain the O2 issue and you can be back on the road.

If you want a blacker version of the control module PDF just click on "Control Module Location" in the JTIS electrical guide for your car. It's in JTIS and also here http://www.captainjaguarscathouse.co...ec%20Guide.pdf

That's also the guide whose page 59 I mentioned.

Any time you suspect the PCM, use a multimeter to check wiring if need be right through to the PCM's connector shown in the Elec Guide

 

Thanks Jagv8, I've never seen the guide you sent the link to. It's fantastic. I guess I've never figured out how to use the JTIS correctly. I just stumble around in it, although I managed to print out much of the info on removing and repairing the engine in it. Apparently my Jaguar mechanic didn't know about checking the wiring through to the PCM's connector in the Electrical Guide> I'll have to give him a copy.
Thanks again

 

I forget how you get to it within JTIS (I hardly ever use it directly as it uses Windows), but being a PDF it's easy to just open it

I'm fairly sure it has a few errors but not many.

 

ttwotees, My supercharger is making a clacking noise. I am removing my supercharger and have read some of you experiences with it. It has been very difficult. I am replacing the rear bearings and hope it fixes the problem. let me know if you have any advice. I'll post pictures as soon as I get enough post as a new member . I am curious about this JTIS you guys are talking about. I have no schematics on how it all goes back together. I had to take the car off the engine to remove the supercharger. It made it a lot easier.

 

Loads of data - look for
jaguar workshop manual
on ebay (about $6-10)

 

wilkerone:
You most likely have a worn coupler. With the high miles I would consider a super charger rebuild but if not at least change the front and rear bearings and seals. Plus rebuild or replace the coupler. Be sure and change the oil too. You can get the oil and coupler repair kits on EBay if you want to do it yourself. There are uprated bearings which are a good idea also.

Post back to the list on what you did and how it worked.

There are several places to get parts or repairs done. Here is one vendor.

http://www.stiegemeier.com/home.html
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JTIS is the Jag workshop manual on CD. You can buiy one on ebay. I posted a long descriptive thread on the forum about removing and installing the supercharger almost 6 months ago. Look for that and you'll see photographs to make it easier. I can't offer any advice about your clacking noise, just make sure you use an authorized Eaton supercharger rebuilder. There are several out there, but I absolutely don't recommend Stiegemeier. He's very difficult and doesn't want you to ask any questions about his work, even though you are paying through the nose for it. Sorry I can't be of more help.