LS3 MAP sensor resistance?
Thread Starter
Racer
Joined: Oct 2011
Posts: 268
Likes: 23
From: Florence Kentucky
LS3 MAP sensor resistance?
Does anybody know what the resistance should measure across the MAP sensor? I'm trying to check and see if maybe a bad senor cause my engine shut off issues the other day. I never pitched a code, but I'm starting here.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,595
Likes: 4,055
From: Cape Coral, Florida
Can’t find a resistance number in Service Info but do you have a scan tool ??…if so you can check either BARO or MAP psi or voltage with ignition on…MAP psi or BARO should be around 14.6-14.7 psi at sea level…MAP voltage should be around 4.8 volts or so !!…if no scan tool you can check the wiring for a 5 volt reference and ground…signal back to ECM would be checked on a scan tool…I would jump the 5 volt reference to the signal wire and see if the scan tool reads 5 volts…if it does signal is good…with a scan tool you can graph some data PIDS while driving and see what may be dropping out causing the shutdown…not an easy diagnosis…this can even be something like a crank causing the shutdown.
Last edited by C5 Diag; Mar 30, 2023 at 01:45 PM.
Thread Starter
Racer
Joined: Oct 2011
Posts: 268
Likes: 23
From: Florence Kentucky
Can’t find a resistance number in Service Info but do you have a scan tool ??…if so you can check either BARO or MAP psi or voltage with ignition on…MAP psi or BARO should be around 14.6-14.7 psi at sea level…MAP voltage should be around 4.8 volts or so !!…if no scan tool you can check the wiring for a 5 volt reference and ground…signal back to ECM would be checked on a scan tool…I would jump the 5 volt reference to the signal wire and see if the scan tool reads 5 volts…if it does signal is good…with a scan tool you can graph some data PIDS while driving and see what may be dropping out causing the shutdown…not an easy diagnosis…this can even be something like a crank causing the shutdown.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,595
Likes: 4,055
From: Cape Coral, Florida
If you can record and graph some of those data PIDS that really helps…tough just watching those numbers as they change while you’re driving.
