Hi here everyone,
I have had my S Type Jaguar 2.5 litre Petrol V6
for over three years now & never had any problems
with it. I live in Co Kildare in Ireland.
I recently went on a brief tour around the
' Ring of Kerry ' - ( highly recommend - very beautiful )
and noticed the Engine Malfunction
light came on -- on the way home .
It has stayed on since although The car seems fine.
I borrowed a code reader & it read the fault : P1108 .
I understand that this shows that the
' MAP SENSOR circuit has a high voltage '
I presume the MAP is defective .
I can purchase one on the Internet .
I just want to know -
IS IT DIFFICULT TO REPLACE on a V6 engine.
ALSO WHERE EXACTLY IS IT ?
Any comments - would be gratefully received this end.
Many thanks. Pat.

 

Pat,

From the experience of my two visits to the Ring of Kerry many years ago, the engine could be waterlogged!

The MAF sensor is in the Inlet Trunking:



Code P1108 does refer to the MAF sensor but it could also be an open or short circuit to the ECM rather than sensor failure. Worth checking the connections first.

Graham

 

Staggering into a pub totally drowned on a never to be repeated cycling tour of said Ring one of the locals said
'Sure 'tis a lovely Country but they forgot to put the roof on'..

Do check the connector to the MAF, it is known to corrode and throw faults.
Cheaper than a new MAF

 

Dear GGG & SteveinFrance ,
Many thanks to both of you , for getting back to me
so quickly . I really didn't expect any feedback so fast .
I have been out all day at my Father -in- law's 80 th
birthday celebrations. I was the nominated driver -
so NO ALCOHOL - as everyone wanted to be driven around
in a Chaffeur Driven Jaguar. Just got back - it is 10pm .
This P1108 code issue has me confused.
I refer to JOsworth on another JaguarForums thread.
https://www.jaguarforums.com/forum/s...e-p1108-46914/
If you glance at his comments he says P1108
relates to an MAP Sensor High Volt Code
I presume a MAP Sensor & a MAF Sensor are NOT
the same thing. Certainly the Codes listed in the PDF
Powertrain DTC Summaries – OBD II
Quick Reference Diagnostic Guide
Jaguar S-TYPE V6, V8 N/A and V8 SC 2003 Model Year
state it is a MAP Sensor .
I am barking up the wrong tree - yet again .
I really appreciate your help with this matter.
Pat.

 

Dear GGG & SteveinFrance ,
Have to agree 100% with your comments on Kerry.
I was blessed when I was there .
I brought myself , my wife & her uncle who
is the youngest 82 year you could ever meet
on a brief 4 day holiday down to Kerry last month .
We were blessed - the weather was great --
I really don't know what happened .
Somebody must have done a Rain Dance -- IN REVERSE.
Anyway we had a great time.
The locals down there - have it made - as far as I can
make out. There is a huge captive audience of
Americans, Japanese & Europeans - not to mention -
a large abundance of UK citizens who are charged
serious amounts for food & accommodation .
There doesn't seem to be any shortage of visitors .
They all seem to love the place.
It seems to be a little Kingdom - all of its own .
WE are having a serious recession here in Ireland -
but not in Co Kerry.
Many thanks for getting so quickly . Pat.

 

Pat,

Sounds like a great day even though you were nominated driver.

These are two different sensors:

MAP = Manifold Absolute Pressure sensor
MAF = M*** Air Flow sensor

Here is the Description & Operation summary for the S-Type 2003MY Electronic Engine Controls:

JTIS - S-Type 2003 - Electronic Engine Controls.pdf

As you don't yet have the required minimum 10 posts to be able to download PDF's from the forum, here's a link to the same document on my MediaFire account:

JTIS - S-Type 2003 - Electronic Engine Controls.pdf

The summary shows the locations of all the sensors and is helpful in understanding the control system.

Graham

 

Pat,

It will be all of forty years since I was last in Kerry and there was no sign of Americans or Japanese there in those days.

Graham

 

Dear GGG ,
Very many thanks for all your help in sending on the
Electronic Controls Summary . Powerful stuff indeed -
and a great insight into what goes where & how it all works.
I really appreciate it.
I'd say 40 years ago - Kerry was a lot different than last month.
Many thanks again. Will let you know - how I get on
with this MAP fault. Regards. Pat.

 

Pat,

If the scan tool you've borrowed can clear DTC's, this would be a good first step.

You know what the code is and the suspect sensor it relates to so you won't be losing any information by clearing the code and resetting the MIL. The monitoring circuits are very sensitive and often a DTC will not reappear after it's been cleared.

Worth a try before assuming the sensor is definitely faulty.

Graham

 

Hello from California. I'm curious to know how you're coming along with that P1108. Did you locate the sensor on your engine? I noticed you mentioned there was no driveabilty problem. Here in California, emissions stuff is pretty crazy compared to when I was a kid.

The MAP sensor on this model in the U.S. is used for EGR fault diagnostics. The engine computer uses the MAP input to determine if the Exhaust Gas Recirculation system is working or not. If the MAP does not function properly, it only causes the MIL to come on and store the code. The EGR diagnostics are put on hold.

My information system says you should have a sensor ground, a 5 volt reference and a signal wire at the sensor. If you need further info, I'll be watching and can research this more.

Good luck out there.

 

Dear jchavez76,
Many thanks for your input.
The MAP sensor is mounted on the top rear of the
V6 Petrol Engine .
Please see Page 2 from this pdf download.

JTIS - S-Type 2003 - Electronic Engine Controls.pdf

It looks to be very difficult to get at & remove.
I suppose if you had hands like a small monkey - it would be easy enough.
I appreciate your help with the voltages.
I will borrow a voltmeter tomorrow & check these out.
I may have to take the car to a garage in order to get the
MAP out.
I can buy one on the internet fairly cheaply.
I will keep you posted about the outcome.
Many thanks. Pat.

 

Hi Pat,

I believe that if you remove the plastic cowl vent screen and the brace that goes across the rear of the engine compatyment, you should have plenty of room. I have pretty large hands. Sometimes you need to make room. I'll try to find the signal wire voltages at various vacuum levels and I'll pass them along tomorrow.

Have fun,
Joe

 

Dear jchavez76,
Again - I appreciate your getting back to me.
I have been away working over the last few days.
Just had a look at the plastic vent & the steel brace
you mentioned. ( I think you know your way
around these S type Jags.)
This looks like a fair bit of room
to work when removed. I will give this a go
over the next few days & let you know - if I
have any success.
Many thanks again. Pat.

 

Hi Pat,

It's my pleasure to pass along any info that may be useful.

I feel your pain. I've got a personal motorcycle and a new to me XJ8 that need major work. There are just not enough hours in the day. I think one of our presidential canditates just promised to change that.

Since you're not getting to it right away, you should clear the code (if you haven't already done so) as was suggested by GGG. He's absolutely right about false codes. If it does not come back, you saved yourself time and trouble. However, I'm a sucker for a chance to diagnose something so I understand if you want to dig in.

The S-type I was going to get readings from was a V-8 with no MAP sensor. If another comes in I'll get that to you. Hope you enjoy what's left of the weekend.

Joe

 

Dear Joe ,
Many thanks for all your input & help.
I did clear the MAP fault last week -
but it came back the moment I restarted the engine --
within about 10 secs .
Not to worry - I will apply myself later
this week & let you know how I get on.
I see you are in California - at least your are out
of the way of that monster storm .
I fear a lot of your fellow citizens on the East Coast
will be suffering for the next few days - at least.
The outcome of your Presidential elections --
will be fascinating .
Stay well. Lots of luck. Pat.