CPS tach movement
Apr 6, 2023 | 05:17 PM
Thread Starter
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Mountain Pass
Joined: Oct 2004
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CPS tach movement
Hey does anyone know if Forscan will still read your RPM’s if the CPS is bad?
I’ve got a crank no start, tach is moving very slightly & when connected to Forscan I can see my RPM’s.
I’ve already gone down a rabbit hole checking other things so I’m just now seeing if I overlooked the CPS.
Apr 6, 2023 | 07:33 PM
Joined: Dec 2012
Posts: 11,269
Likes: 1,654
From: Las Cruces New Mexico
Is the engine spinning fast enough?
is voltage above 10.5 while cranking?
How are you batteries and terminals?
Apr 7, 2023 | 08:32 AM
Joined: Apr 2016
Posts: 7,182
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From: Bahstun
if CPS is bad, PCM cant read RPMs
if tach isnt moving, then CPS is bad or the wires to it are shorted, broken etc
Apr 7, 2023 | 08:44 AM
Joined: Mar 2007
Posts: 4,577
Likes: 837
From: knoxville, tn
Forscan is only going to see rpm if the CPS is working and sending a signal. How many rpms is it showing?
Apr 7, 2023 | 09:15 AM
Thread Starter
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Mountain Pass
Joined: Oct 2004
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Quote:
Originally Posted by
97-psd
Forscan is only going to see rpm if the CPS is working and sending a signal. How many rpms is it showing?
it was showing 100 RPM’s. I put a new starter in and can audibly hear it cranking faster, but can’t get Forscan to connect again and read the RPM’s.
Apr 7, 2023 | 04:42 PM
Thread Starter
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Mountain Pass
Joined: Oct 2004
Posts: 203
Likes: 0
Quote:
Originally Posted by
z31freakify
Is the engine spinning fast enough?
is voltage above 10.5 while cranking?
How are you batteries and terminals?
cranks good, almost 11V while cranking. Cleaned the terminals.
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