Temperature sending unit isuues
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Senior User
Joined: Dec 2005
Posts: 261
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From: Regina, Saskatchewan
Temperature sending unit isuues
I posted earlier about my truck not starting and I think I might have found the issue. Please correct me if I am wrong in my diagnostic.
A few times that I have notices, the temperature gauge has been acting up. turn the key and it goes all the way to H and then comes back down....then to go up again to 3/4 and then to go down again. This is very sporadic and I cannot seem to come up with a pattern.
I have been told that the T.S.U. sends a signal to the glow plug relay saying....ok we're cold, turn on the glow plugs. If that T.S.U. is faulty, could it be the cause of my truck not starting....if it's sendind an erroneous signal to the relay, then the glow plugs wouldn't come on....right?
Can someone shed some light on this and do I have to replace the unit, the cable or both....has anyone ever have this happen?
Thanks in advance,
Yukonsly
A few times that I have notices, the temperature gauge has been acting up. turn the key and it goes all the way to H and then comes back down....then to go up again to 3/4 and then to go down again. This is very sporadic and I cannot seem to come up with a pattern.
I have been told that the T.S.U. sends a signal to the glow plug relay saying....ok we're cold, turn on the glow plugs. If that T.S.U. is faulty, could it be the cause of my truck not starting....if it's sendind an erroneous signal to the relay, then the glow plugs wouldn't come on....right?
Can someone shed some light on this and do I have to replace the unit, the cable or both....has anyone ever have this happen?
Thanks in advance,
Yukonsly
Postmaster
Joined: Aug 2004
Posts: 3,948
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From: SHELTON, WA
well try grounding the 2 big posts on the gpr together for 15 seconds and then start. if it does then you have your answer.
pretty sure gp on time and all that is pcm and eot sensor ....though if a malfunction occured who knows. try grounding the 2 big posts and start it.
pretty sure gp on time and all that is pcm and eot sensor ....though if a malfunction occured who knows. try grounding the 2 big posts and start it.
Fleet Mechanic
Joined: Aug 2005
Posts: 1,277
Likes: 89
From: MD
Originally Posted by 1997F-350
well try grounding the 2 big posts on the gpr together for 15 seconds and then start. if it does then you have your answer.
pretty sure gp on time and all that is pcm and eot sensor ....though if a malfunction occured who knows. try grounding the 2 big posts and start it.
pretty sure gp on time and all that is pcm and eot sensor ....though if a malfunction occured who knows. try grounding the 2 big posts and start it.
Brian
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Senior User
Joined: Dec 2005
Posts: 261
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From: Regina, Saskatchewan
Obviously not the Temp unit....the oil pressure gauge started acting up 2 days ago....maybe it's the instrument panel that's on the fritz....anyone ever take one appart? What should I look for?
Yukonsly
Yukonsly
Elder User
Joined: Mar 2004
Posts: 509
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From: Pasco, WA
I've had mine out a couple of times. Pull to two beauty strips & the two screws; the dash face pops off. I think there's 8 screw holding the inst. cluster in, plus 2 screws to remove the shift quadrant. There are three plugs in the back of the panel, two into the guage clusters & one into the speedo. The inst. cluster connectors are most likely to have corrosion; clean them gently with a pencil eraser. The guage heads unplug. Pull them out & clean the pins that connect them to the inst. circuit panel.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by Briansshop
1997, I know this is getting alittle picky but, you would be shorting those two post together. There'd be lots of fireworks if you shorted them to GROUND. Not trying to be a smart-***, just trying to clear things up.
Brian
Brian
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Logistics Pro
Joined: Apr 2004
Posts: 4,292
Likes: 5
From: NJ where fun comes to die
My 90 IDI has an instrument voltage regulator. It will make the gauges act up if it goes bad. I don't know if the PSDs have one or not. I don't think there is any connection with the starting issue. Try what 1997F-350 said.
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