Oil Pressure Sensor HELP
Thread Starter
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Joined: Nov 2012
Posts: 63
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From: Cobden Ontario
Oil Pressure Sensor HELP
I've replaced my oil pressure sensor but am still getting no pressure reading on the cluster. We confirmed that the cluster works--it looks like the sensor doesn't have power. I've have the wiring diagram and tried to follow the wire as it leads away from the sensor but loose it in the close quarters under the hood. I'm thinking it may be a broken wire that is the problem.
Where does the wire physically head from the sensor?
Any help is appreciated.
Where does the wire physically head from the sensor?
Any help is appreciated.
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
I don't have the schematic -
But have you checked "all" the fuses?
It's a starting place!
Thanks,Matt
But have you checked "all" the fuses?
It's a starting place!
Thanks,Matt
Instructor
Joined: Feb 2011
Posts: 241
Likes: 1
From: Axton va
the LS engines are bad about the oil pump pick up o-ring failing and causing lose of oil pressure.the best way to test for that is to pull the fuel pump relay so the car wont start,remove the oil filter and with a catch pan under it have someone spin the engine over for a few seconds.if you get oil then then the o-ring is good,if not the o-ring is bad.its like trying to drink a milk shake with a hole in the straw,the pump gets nothing but air. I just replaced one in an 07 suburban with an LS1 in it that had zero oil pressure.
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
He can post it up for you to see as well and it will be much easier!
He is the wiring guru here
Thanks,Matt
Le Mans Master
Joined: Sep 2003
Posts: 6,275
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From: Farmington CT
Cruise-In VII Veteran
I would get a "known good" OPS and plug it it
GOOD, gauge sweep returns to zero
BAD, gauge sweep pegs out max (typical)
this can be done prior to engine start (KOEO)
the engine harness run along the block and RHS cyl head then feeds under the battery
GOOD, gauge sweep returns to zero
BAD, gauge sweep pegs out max (typical)
this can be done prior to engine start (KOEO)
the engine harness run along the block and RHS cyl head then feeds under the battery
Tech Contributor
Joined: May 2008
Posts: 3,100
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From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
Is the +5V reference voltage present, when measured from Pin B of the sensor connector plug to a chassis ground?
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Tech Contributor
Joined: Dec 1999
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Here is the schematic that you need. The 5 VDC comes from the PCM.
The GREY wire has to have 5 VDC. Have you connected or disconnected any sensors lately?? Could have damaged a pin.
I installed a MAP Sensor extension harness and Murphy's law says that the harness can be plugged in 180 out
I had no oil pressure reading also until I flipped the connector over. 
NOTE. If you have a problem with any other sensor, it can affect the other sensors. See if you have 5 VDC on the other sensors.
The GREY wire has to have 5 VDC. Have you connected or disconnected any sensors lately?? Could have damaged a pin.
I installed a MAP Sensor extension harness and Murphy's law says that the harness can be plugged in 180 out
I had no oil pressure reading also until I flipped the connector over. NOTE. If you have a problem with any other sensor, it can affect the other sensors. See if you have 5 VDC on the other sensors.
Last edited by Bill Curlee; Nov 23, 2012 at 06:01 PM.
Thread Starter
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Joined: Nov 2012
Posts: 63
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From: Cobden Ontario
Thanks for the oil pressure sensor help
Thanks for the help guys--I've gotten tied up with a few other projects and haven't made it back to the problem yet. I'm putting the car away this weekend and luckily have a space that I can do some work on it over the winter.
I'll keep you posted on how it goes.
Keep up the great forum--I'm learning tons from the postings.
Thanks again for the help
Canadian FRC Eh!
I'll keep you posted on how it goes.
Keep up the great forum--I'm learning tons from the postings.
Thanks again for the help
Canadian FRC Eh!
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Look at the schematic Where each wire goes into the PCM you will see a pin number and a dotted line. At the end of the line its labled C1 or C2
SO,,,, the Grey wire is in PCM Connector C1 at pin #7
The black wire is in PCM Connector C2 at pin #63
SO,,,, the Grey wire is in PCM Connector C1 at pin #7
The black wire is in PCM Connector C2 at pin #63
Intermediate
Joined: Mar 2012
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I am having the same problem on my 07. Gauge sweeps but stays at zero. Replaced sensor with no luck same issue. Held the acc switch for 5 seconds to turn every thing on and I am not getting the 5v on the reference wire when I put a volt meter on it. I really don't think the oil pump is bad its only a year and a half old
Thread Starter
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Joined: Nov 2012
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From: Cobden Ontario
I'll test the wire and let you know
Thanks again for the help
Intermediate
Joined: Mar 2012
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I know we got different year cars but maybe we can help each other through this since we have the same problem. I am 100% sure mine is now electrical. I removed c2 from the ECM and read out wire 41(that's my 5v wire) had .02 resistance so I no the wire is good. I read the actual pin out on the ECM in acc mode and I got 5.7 volts so I know the ECM is good. As soon as I connect c2 back to the ECM and go read wire 41(5v power to pressure switch) it says I have .15v going to sensor. I am going to check my crank position sensor and see if it is shorting out to ground next and is messing up that. But my point to you is if power is good check the other sensors for shorts
Thread Starter
Advanced
Joined: Nov 2012
Posts: 63
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From: Cobden Ontario
I know we got different year cars but maybe we can help each other through this since we have the same problem. I am 100% sure mine is now electrical. I removed c2 from the ECM and read out wire 41(that's my 5v wire) had .02 resistance so I no the wire is good. I read the actual pin out on the ECM in acc mode and I got 5.7 volts so I know the ECM is good. As soon as I connect c2 back to the ECM and go read wire 41(5v power to pressure switch) it says I have .15v going to sensor. I am going to check my crank position sensor and see if it is shorting out to ground next and is messing up that. But my point to you is if power is good check the other sensors for shorts
Burning Brakes
Joined: Jan 2008
Posts: 941
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From: Grand Rapids MI
After about 4 sensor failures, I ended up having to tweak the contacts in the connector, to bend them slightly outward. They had loosened up and were no longer making good connection with the pins on the sensor. Might be worth a try. Just take a small 90* pick and bend the contacts outward slightly.
Jack
Jack
Thread Starter
Advanced
Joined: Nov 2012
Posts: 63
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From: Cobden Ontario
After about 4 sensor failures, I ended up having to tweak the contacts in the connector, to bend them slightly outward. They had loosened up and were no longer making good connection with the pins on the sensor. Might be worth a try. Just take a small 90* pick and bend the contacts outward slightly.
Jack
Jack