5v ref circuit? Two oil sensor issues
Thread Starter
Pro
Joined: Oct 2020
Posts: 529
Likes: 197
From: Columbus, MS
5v ref circuit? Two oil sensor issues
I started a thread a few weeks ago:
https://www.corvetteforum.com/forums/c5-tech/4452605-need-help-trouble-shooting-oil-temp-low-circuit.html#post1602281262
My oil temp readout is dead. Read through that thread for all the details there.
Well, today I had a NEW issue. I was at the track (road course) and my oil pressure went to 0 on the gauge and XXX on the DIC. This is a brand new crate LS3, so I have confidence in it. I still went to the pits and checked, sure enough it was still full of nice clean oil. I re-fired the car, gauge worked, and I called it good. It died again on the next stint though.
I know the sensors are known problem children on these cars, but I also know when they fail they tend to go off-scale high. I haven't dug into this at all yet, but what are the chances my oil temp and oil pressure indication issues are related due to a common problem with the 5v reference circuit? If so, where should I start to chase it down?
https://www.corvetteforum.com/forums/c5-tech/4452605-need-help-trouble-shooting-oil-temp-low-circuit.html#post1602281262
My oil temp readout is dead. Read through that thread for all the details there.
Well, today I had a NEW issue. I was at the track (road course) and my oil pressure went to 0 on the gauge and XXX on the DIC. This is a brand new crate LS3, so I have confidence in it. I still went to the pits and checked, sure enough it was still full of nice clean oil. I re-fired the car, gauge worked, and I called it good. It died again on the next stint though.
I know the sensors are known problem children on these cars, but I also know when they fail they tend to go off-scale high. I haven't dug into this at all yet, but what are the chances my oil temp and oil pressure indication issues are related due to a common problem with the 5v reference circuit? If so, where should I start to chase it down?
Race Director
Joined: Oct 2004
Posts: 12,860
Likes: 4,661
I started a thread a few weeks ago:
https://www.corvetteforum.com/forums...post1602281262
My oil temp readout is dead. Read through that thread for all the details there.
Well, today I had a NEW issue. I was at the track (road course) and my oil pressure went to 0 on the gauge and XXX on the DIC. This is a brand new crate LS3, so I have confidence in it. I still went to the pits and checked, sure enough it was still full of nice clean oil. I re-fired the car, gauge worked, and I called it good. It died again on the next stint though.
I know the sensors are known problem children on these cars, but I also know when they fail they tend to go off-scale high. I haven't dug into this at all yet, but what are the chances my oil temp and oil pressure indication issues are related due to a common problem with the 5v reference circuit? If so, where should I start to chase it down?
https://www.corvetteforum.com/forums...post1602281262
My oil temp readout is dead. Read through that thread for all the details there.
Well, today I had a NEW issue. I was at the track (road course) and my oil pressure went to 0 on the gauge and XXX on the DIC. This is a brand new crate LS3, so I have confidence in it. I still went to the pits and checked, sure enough it was still full of nice clean oil. I re-fired the car, gauge worked, and I called it good. It died again on the next stint though.
I know the sensors are known problem children on these cars, but I also know when they fail they tend to go off-scale high. I haven't dug into this at all yet, but what are the chances my oil temp and oil pressure indication issues are related due to a common problem with the 5v reference circuit? If so, where should I start to chase it down?
Race Director
Joined: Oct 2004
Posts: 12,860
Likes: 4,661
I started a thread a few weeks ago:
https://www.corvetteforum.com/forums...post1602281262
My oil temp readout is dead. Read through that thread for all the details there.
Well, today I had a NEW issue. I was at the track (road course) and my oil pressure went to 0 on the gauge and XXX on the DIC. This is a brand new crate LS3, so I have confidence in it. I still went to the pits and checked, sure enough it was still full of nice clean oil. I re-fired the car, gauge worked, and I called it good. It died again on the next stint though.
I know the sensors are known problem children on these cars, but I also know when they fail they tend to go off-scale high. I haven't dug into this at all yet, but what are the chances my oil temp and oil pressure indication issues are related due to a common problem with the 5v reference circuit? If so, where should I start to chase it down?
https://www.corvetteforum.com/forums...post1602281262
My oil temp readout is dead. Read through that thread for all the details there.
Well, today I had a NEW issue. I was at the track (road course) and my oil pressure went to 0 on the gauge and XXX on the DIC. This is a brand new crate LS3, so I have confidence in it. I still went to the pits and checked, sure enough it was still full of nice clean oil. I re-fired the car, gauge worked, and I called it good. It died again on the next stint though.
I know the sensors are known problem children on these cars, but I also know when they fail they tend to go off-scale high. I haven't dug into this at all yet, but what are the chances my oil temp and oil pressure indication issues are related due to a common problem with the 5v reference circuit? If so, where should I start to chase it down?
Advanced
Joined: Oct 2007
Posts: 90
Likes: 30
From: Berthoud, CO
My experience is that the failed sensor(s) trip the 5v reference error. A couple of months ago my oil pressure sender failed the same way yours did (showing XXX) and also set off code P1635 for low 5v reference. Like you, I thought there might be other issues somewhere in the path because it wasn't the typical pegged pressure error, but replacing the sender fixed the issue.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
READ THE DTCs and see if there are any other sensors that are also complaining. Other sensors on that same 5 VDC circuit can cause 5 vdc issues.. If there are no other issues (DTCs) then you either have a wiring issue/connector issue and OR a faulty sensor.
Bill
Bill
Last edited by Bill Curlee; Oct 26, 2020 at 08:07 PM.
