Why did my oil pressure gauge die?? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > Why did my oil pressure gauge die??

Labor day sale @ rockridge 4wd! 8/29-9/1 site wide..promo Rough Country Deals at JeepHut.comShocktober is here! Get new shocks for your Jeep!!!!

Reply
Unread 05-08-2013, 09:31 PM   #1
dave564
Registered User
2000 XJ Cherokee 
 
Join Date: Sep 2012
Location: Monroe, mi
Posts: 197
Why did my oil pressure gauge die??

Ok, I am getting ready to do some under hood work on my 2000 XJ. I decided to go to the local coin wash to give the engine a bath first.

After the wash I had no oil pressure gauge and the check gauges lite on, (The gauge stays on zero). (ALL OTHER GAUGES STILL WORK) First thought, water intrusion, no big deal. I got home, dried off the plug to the sensor and still no good. I put the instrument panel into the self test, and the gauge does work.

Well 3 days have went by, I am pretty sure all the wiring is dried out by now, but still no gauge.

I am not too familiar with just how the Chrysler gauge is wired. I have looked everywhere I know of for a schematic. Hell, for all I know the damn thing might have blown a fuse.

Any Ideas?

dave564 is offline   Reply With Quote
Unread 05-09-2013, 06:13 AM   #2
bamasteeler
Registered User
1980 CJ7 
 
Join Date: Mar 2007
Location: alabama, ALABAMA
Posts: 673
the oil pressure sensor has 3 wires...
1. 5 volt supply from pcm (orange wire)
2. signal back to pcm (grey/yellow wire)
3. ground back thru pcm (brown/yellow wire)

the pcm then controls the gauge in the instrument cluster. did the pcm get wet when you bathed the engine? may want to take the plugs off the pcm and make sure there is no water in any of the plugs, blow them out with some shop air. possible the sensor is bad too. i am on my second one but mine does just the opposite--it pegs at 80 psi with just the key on let alone when engine is running. $45 part at part store or go to a junk yard and find a 97-2001 cherokee, grand cherokee, tj with a 4.0 and take one off of it, cheaper way to determine if its the sensor or if you have a test gauge you can put in place of the sensor to check oil pressure.
__________________
1980 Jeep CJ7
AMC 258, T176, D300,
AMC 20 REAR, D30 FRONT

1999 XJ CLASSIC
RC 3" front AAL rear
bamasteeler is offline   Reply With Quote
Unread 05-09-2013, 06:14 AM   #3
cruiser54
Web Wheeler
 
cruiser54's Avatar
1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 9,976
Those senders are real crappy. Probably bit the dust.
__________________
Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
Refresh*Connections*Before*Replacing*Components
cruiser54 is offline   Reply With Quote
Unread 05-09-2013, 07:23 AM   #4
dave564
Registered User
2000 XJ Cherokee 
 
Join Date: Sep 2012
Location: Monroe, mi
Posts: 197
Yea the PCM got wet too. I haven't bothered to check the connectors yet. I am actually going to to an engine swap, so I will check it when I pull the harness, and it will be getting a new sensor anyhow. I figured it was going to be something simple, just not sure where to look.
dave564 is offline   Reply With Quote
Unread 05-09-2013, 07:51 AM   #5
bamasteeler
Registered User
1980 CJ7 
 
Join Date: Mar 2007
Location: alabama, ALABAMA
Posts: 673
usually is the sensor. however jeep likes to run everything thru the pcm to make things more difficult!!!! i too like to clean my engine but always keep water away from pcm and distributor.
__________________
1980 Jeep CJ7
AMC 258, T176, D300,
AMC 20 REAR, D30 FRONT

1999 XJ CLASSIC
RC 3" front AAL rear
bamasteeler is offline   Reply With Quote
Unread 05-09-2013, 11:56 AM   #6
buildin1XJ
Web Wheeler
1999 XJ Cherokee 
 
Join Date: Oct 2011
Location: Knoxville, Tn.
Posts: 1,568
I would go with the sending unit because 1 they fail fairly often and you most likely washed that area down pretty well due to heavy oil leaks around the oil filter adapter housing.
buildin1XJ is offline   Reply With Quote
Unread 05-09-2013, 02:15 PM   #7
79chiefs
Registered User
1988 XJ Cherokee 
 
Join Date: Dec 2012
Location: Lillington, NC
Posts: 959
Quote:
Originally Posted by dave564 View Post
Yea the PCM got wet too. I haven't bothered to check the connectors yet. I am actually going to to an engine swap, so I will check it when I pull the harness, and it will be getting a new sensor anyhow. I figured it was going to be something simple, just not sure where to look.
Just Off topic question, why are you doing engine swap? The pressure could have knocked the connector off, or killed the sensor as previously stated.
__________________
99WJ Laredo I6-A 2wd
88XJ-Building on a budget.
95 E34 540i-DD
Had/have 6Jeeps/5Cherokees/4XJ's
79chiefs is offline   Reply With Quote
Unread 05-10-2013, 07:54 AM   #8
dave564
Registered User
2000 XJ Cherokee 
 
Join Date: Sep 2012
Location: Monroe, mi
Posts: 197
Quote:
Originally Posted by 79chiefs View Post
Just Off topic question, why are you doing engine swap? The pressure could have knocked the connector off, or killed the sensor as previously stated.
It has had low oil pressure for a long time now, (20psi at 2000 rpm, and 0 at idle) I finally got the money together, and want to get it done before I need it this summer.
dave564 is offline   Reply With Quote
Unread 05-10-2013, 08:14 AM   #9
bamasteeler
Registered User
1980 CJ7 
 
Join Date: Mar 2007
Location: alabama, ALABAMA
Posts: 673
Quote:
Originally Posted by dave564

It has had low oil pressure for a long time now, (20psi at 2000 rpm, and 0 at idle) I finally got the money together, and want to get it done before I need it this summer.
Has low pressure or indicates low pressure??
__________________
1980 Jeep CJ7
AMC 258, T176, D300,
AMC 20 REAR, D30 FRONT

1999 XJ CLASSIC
RC 3" front AAL rear
bamasteeler is offline   Reply With Quote
Unread 05-10-2013, 12:47 PM   #10
79chiefs
Registered User
1988 XJ Cherokee 
 
Join Date: Dec 2012
Location: Lillington, NC
Posts: 959
Could be bad sender, does it tick? Or any other sign.
__________________
99WJ Laredo I6-A 2wd
88XJ-Building on a budget.
95 E34 540i-DD
Had/have 6Jeeps/5Cherokees/4XJ's
79chiefs is offline   Reply With Quote
Unread 05-11-2013, 07:42 AM   #11
dave564
Registered User
2000 XJ Cherokee 
 
Join Date: Sep 2012
Location: Monroe, mi
Posts: 197
The oil pressure is real low, I checked it with a mechanical gauge. That is why the engine is coming out. THE DASH GAUGE quit working after I power washed the engine.
dave564 is offline   Reply With Quote
Unread 05-11-2013, 08:45 AM   #12
bamasteeler
Registered User
1980 CJ7 
 
Join Date: Mar 2007
Location: alabama, ALABAMA
Posts: 673
Quote:
Originally Posted by dave564
The oil pressure is real low, I checked it with a mechanical gauge. That is why the engine is coming out. THE DASH GAUGE quit working after I power washed the engine.
Would it not be cheaper to do an oil pump instead of whole engine? Unless you got a donor engine sitting around that you been wanting to put in. How many miles on your current engine?
__________________
1980 Jeep CJ7
AMC 258, T176, D300,
AMC 20 REAR, D30 FRONT

1999 XJ CLASSIC
RC 3" front AAL rear
bamasteeler is offline   Reply With Quote
Unread 05-11-2013, 09:13 AM   #13
dave564
Registered User
2000 XJ Cherokee 
 
Join Date: Sep 2012
Location: Monroe, mi
Posts: 197
The previous owner changed the pump about 20,000 miles ago. I plan to pull trailers with this on 500 mile round trips. If it wasn't for that I would have just left it alone and drove it till death.

It is already at the shop, and the engine is now in pieces...
dave564 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.