Engine temp warning light on
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Cargo Master
Joined: Apr 2004
Posts: 3,162
Likes: 1
From: Vilonia Arkansas
Engine temp warning light on
I started her up to leave work tonight and the engine temp warning light was on.She had been sitting for 8 hrs.and was cold its about 60 to 65 here tonight.The light stayed on for about 10mins flickering while I sat at a redlight and finally went out and stayed out . I didn't check for codes will do that in the am. Any ideas ?
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Cargo Master
Joined: Apr 2004
Posts: 3,162
Likes: 1
From: Vilonia Arkansas
I run a 1705 tuner and I usally keep it in tow safe mode but I kicked it up to hp.mode last week checking mpg. The only problems I have with the truck are Intermitent loss of cruise control and I need to change the glowplugs. I have been averaging 18.79 mpg over the last 6weeks it runs great. I did check the codes tonight and got a P0470 exhaust back pres sensor circuit error I have never had that before.
The light did'nt come on this morning when I started it up but when I left work it came on as soon as I started it . The light stayed on about 7 mins didnt flicker or flash like it did yesterday it just went out and stayed out . I really appreciate any help or advice . Thanks
The light did'nt come on this morning when I started it up but when I left work it came on as soon as I started it . The light stayed on about 7 mins didnt flicker or flash like it did yesterday it just went out and stayed out . I really appreciate any help or advice . Thanks
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Cargo Master
Joined: Apr 2004
Posts: 3,162
Likes: 1
From: Vilonia Arkansas
I believe your right about the code since this is the longest I have ever had it in the hipo mode.I guess I'm going to start checking conections and wires thats all I can think of . Do you know if the temp guage works off the same sensor as the light because the guage seems to work the way it should even when the light is on. I have had it come on at different times now but only at start up and when the engine is warm it only stays on for about 2 mins. She still runs good enough to show a new chevy ss half ton its tailights and just walked away from him.Thanks for the reply.I will let you know if I find anything.
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FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
There is only one coolant temp sensor (ECT), but I think the "engine temp" light can be triggered by the coolant temp or the oil temp (EOT) sensors.
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Mountain Pass
Joined: Jul 2003
Posts: 199
Likes: 1
From: Fort Mill, SC
My '97 had its "engine temp" light come on right after I decided to wash the engine for the first time. Turns out that the sensor went bad. The sensor for the "engine temp" light is located on the front of the passenger side head just to the left of the waterpump as you look at it from the front of the truck. I thought the gauge sensor was the one on top of the water pump.
Jeff
Jeff
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
The one on top of the waterpump is the ECT. The EOT sensor is located on the back side of the high pressure oil pump reservoir.
I'm not familiar with any sensor on the front of the passenger side head. Can you identify it from this picture? http://community.webshots.com/photo/...84042038YpzSoJ
I'm not familiar with any sensor on the front of the passenger side head. Can you identify it from this picture? http://community.webshots.com/photo/...84042038YpzSoJ
Mountain Pass
Joined: Jul 2003
Posts: 199
Likes: 1
From: Fort Mill, SC
There is no reference to it in that picture. I just went and looked at my truck with a flashlight. It sits above the left side of the water pump. The electrical connector is the same type as the one that goes to the sensor on the top of the water pump(13). The wire that connects to it comes out of the same loom also. I wonder if this sensor was eliminated in later model years. It seemed redundant to me at the time.
Jeff
Jeff
Mountain Pass
Joined: Jul 2003
Posts: 199
Likes: 1
From: Fort Mill, SC
Here's a link to a manual showing the location of my sensor. Click on "engine electrical" and then "engine connections, front view". The interesting thing is that they don't show an additional one on top of the waterpump. Also, if you click on "engine connections, top view" they show yet another location for a side mounted ECT. From the picture it is also apparant that my sensor mounts into the front of the block and not the head as I thought. It's pretty tough to see in there.
Engine diagram
Jeff
Engine diagram
Jeff
Last edited by Jeff396; Oct 19, 2005 at 07:24 AM.
Thread Starter
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Cargo Master
Joined: Apr 2004
Posts: 3,162
Likes: 1
From: Vilonia Arkansas
Jeff396 when the light came on did the temp gauge work normal if so maybe that's why this two one on the side and the one in front. I went out and checked and it has the front mount just like yours . I will pick a sensor up and change it out and let you know . Thanks those diagrams were very helpful and it does look like there is a difference between the early and the late .
Thank you both .
Thank you both .
Thread Starter
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Cargo Master
Joined: Apr 2004
Posts: 3,162
Likes: 1
From: Vilonia Arkansas
Well I picked up a sensor and went out to change it and it looked like I would have to pull the alt. bracket and idler pully And I didn't have the time to do it but I had pulled the wire off . So I put it back on pulled it back and forth a few times and lo and behold light has been operating correctly since. Thanks for the help I think I'm going to just hang on to the sensor just in case.
Dave
Dave