Analog temp signal to dash - ZR-1 Net Registry Forums

Jetjock · 12-13-2010

We just got done replacing the starter, coil packs, injectors, spark plugs and two new temp sensors. Started the engine and the didgital temp gauge works but the analog temp gauge just sits there and doesn't move. For some reason, I seem to remember that the temp sensor for the gauges runs off the one sensor but having a hard time finding it in the service manual. Is this true about the sensor or is another one at fault because I can't find the location for another one?

sammy · 12-13-2010

the analog guage sensor is located on the drivers side inj housing. if you replace the sensor as i did with one from autozone be mindfull that the guage might read different as mine did . i thought i had a real problem until i hooked up my scan tool and found that 180 deg. was now in the middle of the guage . if nachos isnt working you might just have not got the connection back on all the way . i dont know if it would effect the digital guage . i would call corey henderson he would know .

Jetjock · 12-13-2010

Okay. Are we talking about the two temp sensors inside under the plenum? I know about those. What my question is is what drives the analog gauge in the insturment cluster? I know that the bottom sensor feeds the digital gauge and the top one feeds the ECM. Where is the sensor that feeds the analog gauge in the cluster? I think that the digital sensor also feeds the analog one but can't find the proof that I need in the service manual.

-=Jeff=- · 12-13-2010

Quote:

Originally Posted by Jetjock

Okay. Are we talking about the two temp sensors inside under the plenum? I know about those. What my question is is what drives the analog gauge in the insturment cluster? I know that the bottom sensor feeds the digital gauge and the top one feeds the ECM. Where is the sensor that feeds the analog gauge in the cluster? I think that the digital sensor also feeds the analog one but can't find the proof that I need in the service manual.

there are 2 sensors in the IH.. one for ECM one for analog gauge. the digital one gets the info from the CCM which gets it from the ECM

sammy · 12-13-2010

from what i understand each gauge is independant. the digital gauge is the one that goes to the ecm. and the analog just goes to the inst cluster. if they were interwired to each other then you wouldnt have the need for 2 sensors. the ecm deals with digital info. the analog or sweep gauges are a totally different deal dealing with resistance to get the reading

sammy · 12-13-2010

to clarify the analog sensor only feeds the gauge. the ccm and ecm cant convert analog readings info into usable info. they need digital info

sammy · 12-13-2010

it the same reason we have 2 oil pressure sensors . one on top is analog and the one thats a bitch to get to is the digital info for the computor

Jetjock · 12-13-2010

Believe it or not, I was told by a well respected Corvette ZR-1 type that the bottom sensor was the digital one for the dash. I knew that the other one was for the ECM but that does make sense since you would need a converter to change the information to read both. The service doesn't really clarify that point. I understood that the ECM is strictly digital but the info that I got from this guy was freaking out the understanding that I had about it.

Paul Workman · 12-13-2010

Quote:

Originally Posted by sammy

it the same reason we have 2 oil pressure sensors . one on top is analog and the one thats a bitch to get to is the digital info for the computor

Ummmmm..... Of the 65 electrical connections on the LT5, there are actually 3 oil-related sensors, if I'm not mistaken. They're on the oil filter housing: The top one is a 3-wire analog pressure sensor, the one in the middle toward the front is the oil temp sensor, and that one down underneath is (a single wire) low oil pressure switch (turns on the idiot light). As far as oil sensors go...that's about it.

BTW, ALL of the oil measurement sensors are analog, unless you want to call the low pressure switch "digital" in that it is a two-state device.

(None have A/D converters in them) The output of the pressure sensor runs the analog pressure gauge on the dash, but the feed is split off to an A/D converter before feeding the ECM.

P.

-=Jeff=- · 12-13-2010

Quote:

Originally Posted by Jetjock

Believe it or not, I was told by a well respected Corvette ZR-1 type that the bottom sensor was the digital one for the dash. I knew that the other one was for the ECM but that does make sense since you would need a converter to change the information to read both. The service doesn't really clarify that point. I understood that the ECM is strictly digital but the info that I got from this guy was freaking out the understanding that I had about it.

I will check tonight, but I am pretty sure the one sensor is the analog and the other is ECM & digital

12-13-2010	#1
Jetjock Join Date: Mar 2008 Location: Auburn, KY Posts: 557	Analog temp signal to dash We just got done replacing the starter, coil packs, injectors, spark plugs and two new temp sensors. Started the engine and the didgital temp gauge works but the analog temp gauge just sits there and doesn't move. For some reason, I seem to remember that the temp sensor for the gauges runs off the one sensor but having a hard time finding it in the service manual. Is this true about the sensor or is another one at fault because I can't find the location for another one?

12-13-2010	#2
sammy Join Date: Jun 2010 Location: Lone Pine, CA Posts: 580	Re: Analog temp signal to dash the analog guage sensor is located on the drivers side inj housing. if you replace the sensor as i did with one from autozone be mindfull that the guage might read different as mine did . i thought i had a real problem until i hooked up my scan tool and found that 180 deg. was now in the middle of the guage . if nachos isnt working you might just have not got the connection back on all the way . i dont know if it would effect the digital guage . i would call corey henderson he would know .

12-13-2010	#3
Jetjock Join Date: Mar 2008 Location: Auburn, KY Posts: 557	Re: Analog temp signal to dash Okay. Are we talking about the two temp sensors inside under the plenum? I know about those. What my question is is what drives the analog gauge in the insturment cluster? I know that the bottom sensor feeds the digital gauge and the top one feeds the ECM. Where is the sensor that feeds the analog gauge in the cluster? I think that the digital sensor also feeds the analog one but can't find the proof that I need in the service manual.

12-13-2010	#5
sammy Join Date: Jun 2010 Location: Lone Pine, CA Posts: 580	Re: Analog temp signal to dash from what i understand each gauge is independant. the digital gauge is the one that goes to the ecm. and the analog just goes to the inst cluster. if they were interwired to each other then you wouldnt have the need for 2 sensors. the ecm deals with digital info. the analog or sweep gauges are a totally different deal dealing with resistance to get the reading

12-13-2010	#6
sammy Join Date: Jun 2010 Location: Lone Pine, CA Posts: 580	Re: Analog temp signal to dash to clarify the analog sensor only feeds the gauge. the ccm and ecm cant convert analog readings info into usable info. they need digital info

12-13-2010	#7
sammy Join Date: Jun 2010 Location: Lone Pine, CA Posts: 580	Re: Analog temp signal to dash it the same reason we have 2 oil pressure sensors . one on top is analog and the one thats a bitch to get to is the digital info for the computor

12-13-2010	#8
Jetjock Join Date: Mar 2008 Location: Auburn, KY Posts: 557	Re: Analog temp signal to dash Believe it or not, I was told by a well respected Corvette ZR-1 type that the bottom sensor was the digital one for the dash. I knew that the other one was for the ECM but that does make sense since you would need a converter to change the information to read both. The service doesn't really clarify that point. I understood that the ECM is strictly digital but the info that I got from this guy was freaking out the understanding that I had about it.