Tachometer while cranking question
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Senior User
Joined: Oct 2010
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Tachometer while cranking question
So I'm dealing with a crank no start issue and have a question. Shouldn't my tach be registering some rpms while cranking? While cranking my tach does not move at all, no rpms. I haver a code reader that displays live data and it is showing about 160 rpms while cranking but nothing on my tach.
If this should be registering what would cause that failure? Would it be the crankshaft or camshaft sensor?
Thanks for your help.
If this should be registering what would cause that failure? Would it be the crankshaft or camshaft sensor?
Thanks for your help.
Cargo Master
Joined: Oct 2005
Posts: 2,599
Likes: 2
From: Farmington NM
I just walked out and checked mine, The TAC stays on 0 until I release the key from start, So during crank it is on 0. If I leave it in gear and turn it to start the tac stays on 750 RPM even if I rev the engine. SO the tac works only in the run position, not the start position.
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Check this video. At 0:30
6.0 Liter Ford Powerstroke - High Pressure Oil Pump & Revised STC Fitting Part 1 - YouTube
6.0 Liter Ford Powerstroke - High Pressure Oil Pump & Revised STC Fitting Part 1 - YouTube
Thread Starter
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Senior User
Joined: Oct 2010
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I just walked out and checked mine, The TAC stays on 0 until I release the key from start, So during crank it is on 0. If I leave it in gear and turn it to start the tac stays on 750 RPM even if I rev the engine. SO the tac works only in the run position, not the start position.
Hotshot
Joined: Apr 2010
Posts: 19,071
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From: Saratoga Springs,UT
This is the way I understood it to
And this was for all vehicles not just the 6.0L
But with Marks info in other thread I am little confussed
Junior User
Joined: Oct 2005
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Here is a good way to check your cam sensor and crank sensor signals to the pcm. This is a quote from M-chan68 so he gets the credit.
here is a link to the pcm connectors. It's the middle connector plug #C1381t
https://www.box.com/s/38db5e11b446942bcf7d
f you want to verify those circuits, you can connect a DVOM to both the CKP and CMP circuits of the middle PCM connector. Set your DVOM to Hz. On the CKP circuit, you should be seeing 150 to 200 Hz when the engine is cranked over (directly proportional to 150 to 200 RPMs). On the CMP circuit you should get a reading of 1.1 to 1.9 Hz when the engine is cranked over. Hopefully you won't have to go this far before you resolve your issue.
https://www.box.com/s/38db5e11b446942bcf7d
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Cargo Master
Joined: Oct 2005
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From: Farmington NM
Your welcome, Glad to help
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I just walked out and checked mine, The TAC stays on 0 until I release the key from start, So during crank it is on 0. If I leave it in gear and turn it to start the tac stays on 750 RPM even if I rev the engine. SO the tac works only in the run position, not the start position.
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