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CPS tach movement

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Old Apr 6, 2023 | 05:17 PM
  #1  
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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.
 
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Old Apr 6, 2023 | 07:33 PM
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Is the engine spinning fast enough?
is voltage above 10.5 while cranking?
How are you batteries and terminals?
 
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Old Apr 7, 2023 | 08:32 AM
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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
 
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Old Apr 7, 2023 | 08:44 AM
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Forscan is only going to see rpm if the CPS is working and sending a signal. How many rpms is it showing?
 
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Old Apr 7, 2023 | 09:15 AM
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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.
 
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Old Apr 7, 2023 | 04:42 PM
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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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