2008 Chevy Work Truck Cooling Fans Only Come on When Unplug Ect Sensor

952g63t · 401 33 Mar 19, 2012 Summit Point, West_Virginia

Replaced the temp sensor, same.

Checked the continuity of the trot that connects to the detector. Both leads are fine.

IT's possible that they come on when it gets Really hot, just I cannot confirm this.

When the car is running, I gulf the temp sensing element clip and they kick on like they would normally.

Could it be my ECU? Or, could it be a relay?

Thanks,

yukiz · 460 3 Jun 17, 2009 Laurus nobilis area, California

Does your car boogs down, similar it looses its compression or feels like nary firing timing at all? if IT is..
Most apt to be your ECU. I had that symptom endmost time, and swapped the ECU.
But it is a good thing to check your relay. The relay should be located passenger go with, underneath the radio.

luv2rallye · 8,078 931 Jun 7, 2003 Minneapolis, Minnesota

Since the fans turn on when the temp sensor is incoherent, it tail't be a fan relay. It must be the 2 wire temp sensor Oregon the ECU. Most likely the temp detector since when it's disconnected, the ECU turns the fans connected. BTW yukiz is referring to the MFI or fuel pump relays.

952g63t · 401 33 Mar 19, 2012 Summit Point, West_Virginia

Thanks for the help/replies.

I will test and do some logging when I get home this evening and report back with results. Specifically, the running temps and any other entropy I lavatory gather.

Thanks again,

Does your car boogs low, same it looses its compression or feels like no lighting timing at all? if it is..
Most likely to be your ECU. I had that symptom last time, and swapped the ECU.
But it is a good thing to check your relay. The relay should personify located rider English, underneath the radio.

Nary noticeable performance issues while the sensor is blocked in. I drove it with the sensing element unplugged for about 25 miles, it seemed as though it was pulling timing or something.

Redact:

I was not able to get my logging tool to work. Really didn't matter because I almost hot on my outing. Fans are not coming on at high temps...

I was cruising at 75 for about 20 minutes past my temporary worker started to shoot up bypast the symbol, never actually going above it. Temps came back down after I slowed down.

I just dont get it.

952g63t · 401 33 Mar 19, 2012 Peak Target, West_Virginia

I am going to test the voltage readings to the 2 pins. What should I represent seeing on each precede? I believe they are both melanize wires, matchless has continuous white stripe, and the other is a broken in/dashed White River stripe.

Only other affair I can think back to test is continuity from pin 83 on the ECU, and the ECU itself for leaky caps, etc.

Thanks,

952g63t · 401 33 Mar 19, 2012 Summit Point, West_Virginia

I will stress that, thank you.

I English hawthorn wire upwardly my fans to my AC fan power in say to have something until i can material body this out.

:banghead:

luv2rallye · 8,078 931 Jun 7, 2003 Minneapolis, Minnesota

It's still good to check resistance even though it's new - bad red-hot ones have been known to happen.

If CTS is ok it is possible the ECU is deplorable (usually leaky caps) so you should probably check that next. All the same first unplug the CTS and with key on, measure electric potential on the rein side connective. It should be 5v. Now connect the CTS and measure voltage once more with key on (Crataegus oxycantha have to plug CTS in with jumpers to get at it).
At 32*F: you should get 3.2-3.8v.
At 68*F: 2.3-2.9v.
At 104*F: 1.3-1.9v.
At 176*F: 0.3-0.9v.
This wish help see if at any rate that percentage of the ECU is reading correctly. Course if you always read near zero, you may also consume a broken wire or a connective that ISN't mating properly.

952g63t · 401 33 Mar 19, 2012 Summit Bespeak, West_Virginia

5.6 - 5.7 at plug with ignition on.

Not able to psychometric test with it engaged, I need whatever alligator clips or something.

Going to go ahead and pull my ecu and give IT a good formerly finished.

Sensor immunity checked out.

Here are some shots of the ecu, didn't see anything to cause alarm clock.

This really actually sucks.

luv2rallye · 8,078 931 Jun 7, 2003 Minneapolis, M

No rotten Pisces the Fishes smell connected ECU board Beaver State components leaking?
This doesn't add up. You disconnect the CTS and fans (both fans at high upper?) exit on which says the ECU is working and the CTS is bad. Yet you've replaced (the 2 wire CTS one now - non the 1 wire matchless) the CTS and measured it's resistance and you say it's in spec. It still sounds like the CTS is bad or perhaps it's connection isn't mating properly. Deterrent it's connector. Then link up the CTS through jumpers to IT's connexion so you can mensuration the voltage on it. Compare to specification values I expressed in position 9.

952g63t · 401 33 Mar 19, 2012 Summit Point, West_Virginia

No rotten fish olfaction on ECU board operating theater components leaking?
This doesn't make sense. You unplug the CTS and fans (both fans at high speed?) run short on which says the ECU is working and the CTS is bad. Yet you've replaced (the 2 conducting wire CTS unrivalled now - not the 1 wire peerless) the CTS and measured it's resistance and you say it's in spec. It smooth sounds corresponding the CTS is bad or perhaps it's connection isn't mating properly. Check it's connector. Then connect the CTS done jumpers to it's connector so you can measure the potential on it. Compare to spec values I stated in post 9.

No fishy look, no leaky caps.

Fans come on, non sure if its high bucket along merely they sound normal compared to how loud they were ahead.

Yes, the (2 wire) CTS.

Resistance sounded Oklahoma, and changed slenderly subsequently information technology warmed up in my hand.

The clip goes on fine-textured and snaps into place. I can't see wherefore there would live a fault there after testing the leads on the clip and the CTS.

Whatever unusual possible points of loser?

Thanks for the assistant luv2rallye

luv2rallye · 8,078 931 Jun 7, 2003 Minneapolis, Minnesota

You have the stock fans?
When unplugging the CTS do some fans come with on or only combined (which one)?

The just early thing I can cerebrate of is for the passenger side lover, peradventure the A-11x fan relay (locomotive fusebox, bottom row, 3rd from rightfield) which controls medium speed, doesn't solve. And when you pull the CTS, the ECU turns the fan on using the some other relay (A-13x, which is 5th from right). Eastern Samoa a test you could try swapping A-11x (bottom rowing, 3rd from right) with A-09x (bottom row, 1st from right) to see effect. [You English hawthorn just fall back one of the speeds of the drivers side buff when A/C is connected aside doing this.]

952g63t · 401 33 Mar 19, 2012 Summit Point, West_Virginia

Mishimoto slim fans, wired into the passenger side (main fan) harness feed. The connector for the drivers side (ventilate con provender) is non used currently.

They both come on when I gulf the CTS.

I tested the top pins for continuity and swapped around all of the relays for the fans when I first noticed this and there was zero variety. Still could live a bad relay somewhere in thither, I need to apply voltage to them to essa the switching function still.

Something else I meant to order, although I am not sure if it was because of my wifes phone, my OBD2 tool was not syncing the other dark. I am stopping by a buddies house on my way home to borrow another android phone to tryout my tool.

If OBD2 was dead, could that as wel be from a malfunctioning ECU?

luv2rallye · 8,078 931 Jun 7, 2003 Minneapolis, Minnesota

Yes it could (or bad business leader or ground connected the connective). Your slim fans are 2 wire ones, correct? And they are connected in twin to the passenger side harness with fan plus connected to both the white-blacken and white-blue wires, and fan negative to both the black and puritan-green wires, correct? If and so, then sounds wish maybe a bad ECU. Can you swap with some other ECU?

952g63t · 401 33 March 19, 2012 Summit Point, West_Virginia

Yes information technology could (or no-good top executive or ground on the connector). Your svelte fans are 2 wire ones, right? And they are connected in parallel to the passenger side rule with fan advantageous connected to both the white-pitch-dark and white-blue wires, and fan negative to some the black and chromatic wires, correct? If so, then sounds like maybe a bad ECU. Can you swap with some other ECU?

I followed a indite up to the T when I installed them, but that sounds about right.

I come not have another ECU to test with. Charging up this android phone to see if I can get a temperature reading from the ECU.

EDIT:

No skilled, couldn't get this phone to connect either. :barf:

Really starting to think its my ECU, the power LED is lit up on my obd2 electronic scanner.

Next step I guess is to see if the damn OBD2 port is temporary.

952g63t · 401 33 Mar 19, 2012 To Item, West_Virginia

I was sitting hither racking my brains over this and was wondering, what if my water pump was failing? If it wasn't circulating enough water through the t-housing, could that trigger a false reading off the CTS? But wherefore would the stock gauge sensor work?

97_4g63t · 472 49 Jun 6, 2010 Carlsbad, New_Mexico

Thanks for the help/replies.
I will try and serve some logging when I get home this evening and report back with results. Specifically, the running temps and any other information I can accumulate.

Thanks once again,

No noticeable carrying out issues while the detector is plugged in. I drove it with the detector unplugged for about 25 miles, it seemed as though it was pull timing or something.

Delete:

I was not able to get my logging tool to work. In truth didn't matter because I almost overheated on my outing. Fans are not coming on at high temps...

I was cruising at 75 for about 20 minutes then my temporary worker started to shoot up past the symbol, never really going above it. Temps came hinder down subsequently I slowed down.

I just dont get it.

going 75 without fans your car shouldn't overheat. That should be heap of airflow. It never actually overheated on the highway though or it did? Did the fans use to work or did you just just install them?

952g63t

going 75 without fans your car shouldn't overheat. That should be plenty of airflow. Information technology never actually hot on the highway though or it did? Did the fans use up to work or did you just scarce install them?

While driving towards the final stage of my trip I noticed the temporary worker top mid way, and would fluctuate depending on general amphetamine. If I was going fast it would get heated up, if I was going adagio it would recover to normal op temp.

Fans worked great all terminal summer and fall.

luv2rallye · 8,078 931 Jun 7, 2003 Minneapolis, Minnesota

I was sitting here racking my brains over this and was curious, what if my piddle pump was failing? If it wasn't circulating sufficient weewe through the t-housing, could that trigger a imitative Reading off the CTS? But why would the unoriginal gauge sensor work?

Yes if the CTS wasn't acquiring hot water on that because inaccurate water pump or non enough water, that would do it. Make dependable the radiator is full and air burbed out: http://www.dsmtuners.com/forums/mai...ation-temperature-problems.html#post153386862.

DSM1G90 · 5,104 64 Apr 6, 2008 Nampa, Idaho

Been reading this carry on a like event that just flared up with my 1G90 Optical maser: During a run in town today after acquiring off the freeway, my CEL was suddenly coming on, stay on awhile, then would live off..and come reactionary back along after a minute more or less...then settled down to remain off.

Then, another issue has been surfacing occasionally and happened today with situation above:

My temp gage was dead centre operating theater just below nonliving center..simply once in a blue moonlight, the gauge would suddenly peak to hot for a few seconds (like if the sending unit wire suddenly touched chassis), so suddenly generate back to normal reading material.

Anterior to my going away home, I did check coolant level in the radiator and it's right up to the inner mouth of the filler sphere.

Got the vehicle home tonight from work and did the beep try which poked stunned a encrypt 21 .. Temporary Sensor. I had sporty replaced the Temp Sensor a few months ago ascribable occasional CEL illumination and eventual ambitious starting from hottish.

My temporary sensor, being only a few months old is deciding to get along bad happening me so soon?

Thx - DSM

952g63t · Feb 26, 2014

Yes if the CTS wasn't getting torrid H2O on it because faulty water pump or not enough irrigate, that would do it. Make sure the radiator is overloaded and air burbed out: http://www.dsmtuners.com/forums/mai...ation-temperature-problems.html#post153386862.

When I was originally troubleshooting the CTS, I had emptied the coolant and completely refilled, bled the system a few multiplication.

ECU swap went in without a trouble (thanks again YUPOK). I did have to swop round my plugs and injectors, but it fired rightist up as was common.

I decided to ask a stumble to quiz what happens with the temps and also to fine tune my new Koni's.

I went about 10 miles to a gas station and stopped to pop the hood. It was not overheating but I knew it had reached op temporary and they should have been running. I unplugged the CTS punch and they kicked on, made some adjustments to my shocks and babied it back off home from there.

So, I'm fairly certain that my ECU is fine.

En route in that location I noticed when I was drive that lonesome my top/middle vents were hot, while my foot up/immix scope was exclusively warm-ish. Also, while cruising information technology seemed American Samoa though exit about 50 ish the engine temporary would get heater, and leaving 65+ it seemed to calm down down. Idle temp held steady in the midst. The gauge cut short to the T-housing was recently redone and again, that sensor is also new so I know the the temporary worker gauge is accurate.

My water pump? I don't understand how that could be defective, the impeller is attached directly do the belt meeting place. Is at that place a grip happening the impeller shaft? I thought it was a mateless piece with some gaskets. My thinking is that it is either spinning the impeller operating theater the shaft is completely broken, and if the ray was broken it would overheat without question.

I have a new Gates ticker happening hand, is it doable to swap the pump with the all-night block still in? I need to seem that one up.

I know the CTS is dear. It has to equal something with the connector from the ECU to the CTS clip. Merely again, I tested the electric potential from the clip with the ignition system happening, information technology was showing 4.5 volts or something some that. Maybe its a chunky that I missed when testing it. :confused:

I need to agree the CTS clip again. After I chill low first :mad:

Lou98GSX · 702 61 Mar 13, 2004 Carmel, New_York

Do you have a way to monitor your coolant temp . If you brawl so first make sure you have the coolant topped off . Then start your car and watch the temp . It will go up to 185 and then atomic number 3 the thermostat opens it will come down a trifle . Next continue to watch the temp rise to 212 then the fans should go on . If the fans don't go connected then check that circuit . If the fans fail on and so your temp should start to follow down to 200 and fans should shut off . Like a sho from what your saying that your temps are getting high spell driving on parkway then you have a stream problem either the thermostat , radiator ,piddle pump OR straight a bad head gasket can causal agent that .

952g63t

Tested all of the relays by applying 12v. They all checked out.

To realize up a little of mental confusion I have about which sensor does what;

The 2 wire snip off & sensor are the ECU/fan controller connection*

The 1 wire clip is only for the gauge*

Is this 100% word-perfect?

And, what exactly should I see at the 2 wire clip with a multimeter w/just the ignition turned happening?

I dont know where to get over from here. :cry:

2008 Chevy Work Truck Cooling Fans Only Come on When Unplug Ect Sensor

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