From the research Ive done, this is a classic volvo problem, and I seem
to be jumping through all the normal hoops with no luck yet.

this is the air temp sensor high input error that sets off the light.

mech 1 said the sensor was in the mass flow sensor - changed - no effect
mech 2 said the sensor was near the front of the car but tested
out ok. also temp on dash seems normal which also uses sensor.
he says maybe computer or wires.
mech 1 said it could still be the sensor, should probably change.

internet research says often misdiagnosed, but could be air filter.


note - non of the mechs were volvo mechs - suggestions for how to
proceed much appreciated.

I may have no choice but to scrap , since I cant register it .... sad

volvomark

 

Well i think its time to take it to volvo mech and see what they say.

 

More information that may help, but its hard for me to judge:

I called the a dealership (in Dublin OH) and asked about replacing
the "AIT" sensor. The parts guy said that the coolant sensor is
what came back on his computer ( I had seen this as a possibility
on another website). Being sceptical, he switched me to the
service guy who also said this was the part, even the though
AIT means air intact temperature. This would fit with what
another mech told me, that the ambient temperature sensor is
what goes to the dash, and that seems to be ok. The dealership
recommended changing the sensor and the thermostat, and I think
I can do that fairly cheaply myself.

On the other hand ... I was crawling under the front of the car
and first found the ambient sensor on the drivers side up near the
radiator. I tested it with a volt meter and hair dryer and it varied
between about 600 ohms and 100 ohms/ cold/hot - fine.
But then I crawled over and found there is another amibient sensor
on the passenger side under the radiator, that clearly was messed up ,
broken ... When I took it off I noticed the little snow light
blinked alittle on the dash. Does anyone know what this sensor does ?
I read somewhere for a different model that if the temp is close to
0 that to triggers something to prevent freezing up something ??

The 3d strain, hopefully that can be put to bed is that there is a
part I found on line for a temperature sensor part called the "intercooler" air temperature sensor. I have a 2.4L S70 GLT but this may only applies to the S70 T5 turbo.

Thanks - only a volvo enthusist would enjoy this discussion.

If I ever solve this, hopefully this will be of help to other checkengine
folks.

Mark

 

How do you know if you have a T5 or a regular GLT?

 

T-5 have T-5 on the trunk. You could also have a non turbo. You can also check the vin. http://www.volvocars.com/us/top/comm...yourvolvo.aspx

 

thanks for the responses. It has a large GLT tagged on the trunk.
I was reading up on it, and I think the GLT has a lower pressure turbo
that only kicks in occasionally compared to the T5, and also a different
engine (2.4 L) and lower hp.


I was looking through an old Chilton volvo repair book 1990-2000. They do
mention an air intact temp (AIT) sensor,
but strangely (compared with the other sensors they mention)
give little detail as to where it might be located or on what models.

What I am trying to find out is what the P0113 error message means for
my 1998 S70 GLT. THe claim is that this is an AIT high output ,
but I don't even know if my car has an AIT sensor... Since the P code
is not unique to volvo - other cars use the same ECU - maybe there is
not a good fit with the error code and actual problem ?

Thanks Mark

 

This page lists the sensors for the S70:

http://www.swedishautoparts.com/S70/...ERATURE+SENSOR

My guess would be part #9445153.

If you click on the link to the FAQ for that part it says:

Part number 9445153 is located in hose that goes to the Intercooler.

The one thing that makes this not clear to me is that it says this part for for 1999-2000 cars, not 1998.

What's your VIN?

 

The VIN is

YV1LS5648W2438254

thanks above for the useful links. I read up a little on the intercooler.

The specs show that the 98 GLT uses an air-to-air intercooler,
so that part may go into input hose, like you said.

Where is the intercooler located ? anyone know ? next to the
radiator ?

thanks Mark

 

The VIN confirms 1998 S70GLT.

I found this post for a 1998 S90 that may help:

http://www.matthewsvolvosite.com/for...hp?f=2&t=21417

The last post says it's one of the sensors near the bottom of the radiator.
You said you found 2 sensors there, and one was good, the other not.

Maybe that's the problem sensor?

 

Thanks, I hope that's it. Its the first time Ive seen any reference to both
sensors. I ordered a new one a few days ago to replace the damaged one,
that should come in a few days.
From all ive seen up till now, it could
either be this second ambient sensor, the coolant sensor (that a dealership
swore was the problem on the phone ) or
a sensor that is suppose to be in the intercooler line, (which I don't know yet if my car has.) I've sent out queries to on-line parts companies to
see if the intercooler sensor should fit in a 98, (they mention only 99-2000 on
the websites).

 

As I mentioned above, I had crawled around under the front of the car and found a second
outside sensor that was cracked, on the passenger side, that connects down behind the front bumper.
I just a replacement on line, and replaced it and whala,
the check engine light went out !
I've been running now for 3 days, and so far its stayed off.
I only found one vague reference on the internet about there possibly being
2 sensors. The other one which appears identical, attaches on the drivers down near the front near the radiator.
THis one had tested out ok. This second one looks identical
but was broken and tested out as a short.

I had paid a little money to have access to Mitchell's website. The
circuits there show one outside sensor (labeled optional right side
of HVAC), one coolant sensor, and one called a PTC air preheating resistor (labeled : optional
on the fresh air intake hose near near filter). The last one is confusing
because its labeled PTC which mean positive temperature coef PTC,
but its drawn as a fixed resistor and in the table given as a fixed 2800 ohm.
Since this is fixed, this would imply that its function is to preheat the
air as the title suggests.It also shows a different type of connection, not
a simple plug to cable, like the outside and coolant sensor show.
It also doesn't connect to the computer and may also take an AC voltage.
But in any case , I never found this sensor or
heater or what ever it is suppose to be in my car. There is no
reference to having 2 outside sensors.

So I would guess that either both sensors need to work, or that
the left sensor is needed for the fuel calculation in the computer
and the right one (which was fine) is used for the outside temperature
sensor displayed on the dash .
Since the check engine light is off now, Im chicken to
start disconnecting and experimenting.

Past threads :

One thread was that there is a volvo part
#9445153 that claims to be a IAT sensor , and is suppose to fit or on
a hose near the intercooler, but listed only for 1999 -2000. I emailed the parts company, and they said that this was not for the 1998, so this obviously couldnt be the problem. I also could never find such a part on my car. This
could be the PTC preheater as mentioned in last paragragh.

My first thread was that the first mech thought the IAT was part of the
mass intake sensor MIF. I did replace that, buying online, but
it had no effect on the check engine light. cost - $45

Another thread is that the volvo dealership I called swore the error
message for IAT due to
the coolant sensor. The reason is that in their parts books, when
you enter IAT sensor, the coolant sensor pops up. I was just about
ready to replace this, but luckily held off, as I think its fixed now.
This really didn't make sense , since there is a separate error code
for when the coolant sensor fails.

Another thread was that the garage mechanic thought that since
my dashboard digital outside temp reading looked ok, then it couldnt
be the outside ambient sensor, and so his conclusion was that it must be the
computer. I almost went down that road. Luckily I held off.
He hadn't seen the other sensor on the front left side ( as viewed
looking towards the front of the car).



WHen I am sure that all is fine, I plan to write up a nice new thread,
that will summarize
and hopefully help out others that have similar problems.
CA is trying hard to get rid of older cars by constantly
tighting the emission requirements. Check engine light
automatically fails smog test here, and thus no registration.
But I love my volvo, 280K mile.
I hope it survives a few more years.

Thanks to all that helped.

 

well....P0113 is the Air Intake Temperature sensor code. So if you are looking on the radiator....you aren't going to find that sensor there. Thats where the coolant temperature sensors might be found. The AIT sensor measures the temperature of the air coming into the motor. So you need to be looking on the air cleaner or intake hose for that sensor.

 

thanks, I agree. It was the dealership that suggested it was the coolant sensor - I didn't
follow his suggestion. I agree the AIT sensor should measure the intake temperature
but in for my GLT, as far I could find, there is no such sensor. The motronics computer
is what puts out the code, which is a general purpose computer used in many cars. So when the GLT volvo motoronics gives the 0113 code, I think it is trying to say its the ambient air temperature sensor. There is no specific code for that sensor so its the next closest thing. Anyways, when I replaced the broken one (there are 2!) the check engine light went out - now out for 3 weeks!