MAP sensor ground question
03-01-2019 | 06:11 PM
#1
Thread Starter
Junior Member
Joined: Oct 2018
Posts: 80
Likes: 1
Year: 1992
Model: Cherokee (XJ)
Engine: 4.0
MAP sensor ground question
I was testing my map sensor with a hand vacuum pump and the voltage was a bit off. About .02-.03 volts off which I’ve read is a big difference. I checked the ground and from the MAP sensor to the chassis/battery there is a resistance of 25 ohms. I believe that is too much (should be under 5). Does this sound like too much? I’m thinking about tapping into the ground on the sensor and running it to a local ground
03-01-2019 | 07:24 PM
#4
CF Veteran
Joined: Dec 2017
Posts: 4,074
Likes: 1,128
Year: 1989
Model: Comanche (MJ)
Engine: 4.0
On a 92, the sensor ground is not the same as the chassis ground. The sensor grounds only go back to the PCM. How accurate is the gauge on your hand pump - probably less accurate than the MAP.
03-02-2019 | 12:34 PM
#6
CF Veteran
Joined: Dec 2017
Posts: 4,074
Likes: 1,128
Year: 1989
Model: Comanche (MJ)
Engine: 4.0
The earlier Renix Jeeps had all the sensors connected to chassis ground. I think all the later Chrysler based electrnocs keep the sensor grounds seperate to minimize electrical noise.
Trending Topics
03-04-2019 | 09:38 AM
#8
Thread Starter
Junior Member
Joined: Oct 2018
Posts: 80
Likes: 1
Year: 1992
Model: Cherokee (XJ)
Engine: 4.0
Thread
Thread Starter
Forum
Replies
Last Post
Turtle_XJ
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
12
10-15-2016 09:12 PM
sbs10v8
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
25
02-13-2013 06:45 PM
ajscherokeeinmoab
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
2
06-02-2010 05:27 AM
TrevorNelson
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
7
03-16-2010 06:51 PM
BowtieGuy3
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
0
12-10-2008 12:02 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)