Where is the IAT sensor in 2007 S60 (typo was S70) Topic is solved

rjj100 · Post by **rjj100** » 22 Nov 2019, 13:16

I would like to clean the intake air temperature sensor, I believe its temperature is reading higher than it should in a cold start in the AM.

Where is it located? Is it next to the intercooler on the drivers side or is that just a boost sensor? Is it below the intake manifold? A picture would be great.

Before you remind me, I have CRC QD (quick drying, safe for plastics, leaves no residue) electrical contact cleaner for the IAT sensor. I have ordered some CRC MAF cleaner for later use on the MAF sensor.

I have searched but not been able to locate this. One diagram showed it next to the MAF sensor.

My car is a 2007 Volvo S60 2.5T.

Post by **RickHaleParker** » 22 Nov 2019, 14:30

There is no 2007 S70 ...

This is for a 2007 S60.

rjj100 · Post by **rjj100** » 22 Nov 2019, 16:08

Thank you Rick! That S70 was a typo should have said S60 (which was correct stated in the body)

I saw that picture and then could not find the IAT sensor along pipe #6. I’ll look again.

The text (I hadn’t seen before) in this picture describes an alternate location, so I might have a chassis above 234500 that has the IAT combined with the boost sensor. That sensor has a bunch of wires. I must be very careful not to break it as I bet it is really expensive!

The temp is dropping and shadows getting long so I will quit for today.

Post by **RickHaleParker** » 22 Nov 2019, 17:52

rjj100 wrote: ↑22 Nov 2019, 16:08 I might have a chassis above 234500

The last six digits of the Vehicle Identification Number (VIN) is the chassis number. You can find the VIN on the title, the VIN tag in the corner of the Windshield or on the Identification plate under the hood.

Post by **jimmy57** » 22 Nov 2019, 18:22

Except ECT is the determinant for cold start, IAT is only for high load monitoring for intercooler outlet. The left side outside mirror temp sensor is ECM ambient temp but again, it is not starting cold temp data. Is the car starting and dying when cold?

rjj100 · Post by **rjj100** » 22 Nov 2019, 18:36

Yes, I didn’t know that. Since my chassis number is even above 600,000, therefore the boost pressure and IAT sensors are together in the same physical part.

I will clean them, maybe tomorrow.

rjj100 · Post by **rjj100** » 22 Nov 2019, 18:55

Jimmy, the car runs great all the time. Cold, hot, doesnt matter. In fact, I just passed Colorado emissions testing today and all the test results were amazingly low, way way way lower than the limits.

My reason for cleaning is that the IAT temperature using my ZR13 scan tool shows the IAT temperature about 10 - 13 degrees F. warmer than my ambient temperature sensor in the right mirror as reflected in the console gauge and the ECM ambient temperature in the left mirror and seen by the same scan tool. I was having trouble getting the evap readiness test to clear until late this AM, and wondered if the car computer compared sensors to determine cold start. Clear as mud?

I’m saying that at cold start early in the AM the IAT temperature is 10 to 13 degrees warmer than both car ambient temperature sensors (left & right mirrors) and my temperature gauge at my house. Since a thermistor has a negative temperature coefficient, the thermistor and the plastic sensor housing probably have a bit of leakage from contaminants making the temperature read higher than it should.

I am not seeing any backfires like one might expect from a lean mixture. The temp diff must result in not too much leaning, and then later when the car warms up the leakage becomes less noticeable since the thermistor resistance has gone down.

Would you just advise leaving it be, not clean it?

Post by **RickHaleParker** » 22 Nov 2019, 21:37

rjj100 wrote: ↑22 Nov 2019, 18:55 My reason for cleaning is that the IAT temperature using my ZR13 scan tool shows the IAT temperature about 10 - 13 degrees F. warmer than my ambient temperature sensor in the right mirror as reflected in the console gauge and the ECM ambient temperature in the left mirror and seen by the same scan tool.

When? In the morning when the engine is dead cold and before starting, after it has been run that day, when it is running ... ect.

Post by **abscate** » 23 Nov 2019, 02:16

Yes, just leave it alone.

The mapping on your scanner could be wrong. If the charge air temperature is wrong enough to affect mixture control you would get trim code engine codes

rjj100 · Post by **rjj100** » 23 Nov 2019, 06:31

Rick, yes, drop dead cold in the AM. Everything should be at the same temp.

Abscate, I slept on it and decided to not clean the IAT sensor at this time. “If it an’t broke, don’t fix it”.

I have other things to work on but that will be other topics if I need help.