rpm gauge?
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Freshman User
Joined: Jul 2010
Posts: 45
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From: Mississippi
rpm gauge?
Got in the truck this morn not payin attention went inside let it warm up came back out to head to work started going and the rpm gauge wasnking. Got up to the stop sign bout 4 miles away turned it off waited turned it back on and it started to work. Got on the highway got goin 65 and the rpms only ran 1000 when usually reads 2200. Idle it read anywhere from 0-500 mostly 0. Figure just a loose connection somewhere but don't know? What's the deal? Is this a problem with others? Oh yeah trucks running fine so its nothing major. This started 3 days after I cut the cat did I miss somthing?
Hotshot
Joined: Aug 2006
Posts: 17,398
Likes: 317
From: Whittier, CA
Sorry to say that I don't know what sensor the PCM uses to sense RPM. The cluster is a common problem on these trucks, especially '05 and up, including bad values displayed. Too bad you don't have a Scangauge or Insight or similar. It would tell you what the PCM sees as the RPM, and if the cluster says something different then you know it is not a sensor. Does not seem likely that the truck would run well with bad RPM data. So I'm betting cluster, OR data cable to the cluster.
Senior User
Joined: Jul 2007
Posts: 233
Likes: 0
From: central valley, CA
I agree with bpounds. It's probably in the cluster. If you want a cheap alternative to Scangauge try ultragauge $39...I paid $56 shipped. UltraGauge Automotive Information Center and OBDII Scan Tool
I have one coming and it should read rpms.
I have one coming and it should read rpms.
Fleet Owner
Joined: Nov 2003
Posts: 27,901
Likes: 3,617
The PCM needs both the camshaft position sensor (CMP) and the crankshaft position sensor (CKP) to determine engine speed (rpms).
Hotshot
Joined: Aug 2006
Posts: 17,398
Likes: 317
From: Whittier, CA
I was thinking it had to be one of those. Didn't think about both. We can assume those are okay if the truck runs great.
I think I would pull the cluster and take a look at the cable connections.
I think I would pull the cluster and take a look at the cable connections.
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