Sensor questions
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Senior User
Joined: Jun 2006
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From: Upland, CA
Sensor questions
Sorry for the dumb questions but I just have to ask to be sure. Could either the coolent temp sensor on top of the water pump or the oil pressure sending unit on top of the HPOP reservior cause the engine not to start?
Thanks
Thanks
Hotshot
Joined: Aug 2006
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How about a little back ground .. ,symptoms , reason you are thinking sensors ,ect ....
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Senior User
Joined: Jun 2006
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From: Upland, CA
Just trying anything right now. I changed the fuel pump, CPS, service the IPR and relaced IPR O-rings, VCG, and Under VC Harness. She ran after all that, then changed the water pump with a new temp sending unit and then would not run. I'm just wondering if maybe I got a bad temp sensor or maybe leaned on something to cause this.
Also, I have also looked around and the drivers side firewall area to see where the OBD1 plug would be and can't seem to find anything. Suggetions?
Thanks
Also, I have also looked around and the drivers side firewall area to see where the OBD1 plug would be and can't seem to find anything. Suggetions?
Thanks
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From: Braham MN
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If a sensor is shorted to ground and pulls down the v-ref it will pull all other sensors with it that share the same v-ref signal. I don't have my schematics here to see what shares with the temp sensor but the answer is yes it can cause it to not start.
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Posting Guru
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From: Braham MN
I think all the 3 pin sensors are powered off the same 6V circuit. I had an EOT sensor short out in some guys driveway and the PCM wouldnt power up because the shorted sensor wouldnt let the PCM relay pull in.
BUT the water and oil sensors are one wire hot feed I thought they got power from another 12V source
Diesel Rod
BUT the water and oil sensors are one wire hot feed I thought they got power from another 12V source
Diesel Rod
Hotshot
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So the answer is still ,,,no...
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Senior User
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From: Upland, CA
Yes the IPR is plugged in and also has current in one on the wires. Tach moves but no smoke.
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Joined: Feb 2010
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what?
I have a 97 and the temp sensor signals the pcm and the guage, also if I unplug the hpop sensor on top
of the resevoir the truck will not start. Plug it in and it starts. I would like to know how to unplug the sensor I'm guessing is the ipc
. I can't seem to disconnect the plug. Also my diag. Plug is under the dash and is obd2.
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temp sensor
The other day I put a new tranny in and was driving down the road when my temp guage dropped all the way down and then back
up then down again. Now it doesn't take a reading it just stays down on cold all the time. When this happened I lost all forward gears.
Like it went to neutral from drive. Any ideas.
up then down again. Now it doesn't take a reading it just stays down on cold all the time. When this happened I lost all forward gears.
Like it went to neutral from drive. Any ideas.
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From: West Texas
I've never heard of either of those sensors causing the engine to not start but I can tell you that the 1 wire connectors on both of them corrode and cause false or no signals to the gauge or pcm. Wiggle the connector around and see if it changes. If it does then clean the connector out real good with a drill bit or something and squeeze it a bit to tighten it up. Those two sensors going bad are super rare. It's almost always a corroded connector. Dissimilar metals.
