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ECU not recognizing Crank Pos Sensor

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Old Aug 26, 2021 | 11:22 AM
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Default ECU not recognizing Crank Pos Sensor
Just rebuilt a 4.7 pulled from a junk truck. Checked VIN for compatibility. After install in my truck ('04 1500), it's giving me a "No" for the Crank Sensor signal and a "Yes" for Cam sensor. Scope shows a solid signal to the ECU (tested at the ECU plug) and it is 5 volts. Swapped ECU with a properly running truck with the same engine and compatible VIN and it is doing the same thing. It runs rough and takes a little while for the tach to show RPM's. Any help would be appreciated.
 
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Old Aug 26, 2021 | 04:03 PM
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What year was the donor engine?
 
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Old Aug 26, 2021 | 04:13 PM
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Originally Posted by HeyYou
What year was the donor engine?
I'm pretty sure it was an '03? Positive it was 3rd Gen.
 
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Old Aug 26, 2021 | 08:20 PM
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When did the change from 16 tooth tone ring, to 32 tooth happen? Wasn't it right around in that area??
 
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Old Aug 26, 2021 | 10:10 PM
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Originally Posted by HeyYou
When did the change from 16 tooth tone ring, to 32 tooth happen? Wasn't it right around in that area??
Both engines involved are 16 tooth. Only kept the block. Reman crank.
 
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Old Aug 27, 2021 | 08:21 AM
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Pinched wires? Bad sensor?
 
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Old Aug 27, 2021 | 08:55 AM
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Originally Posted by HeyYou
Pinched wires? Bad sensor?
Swapped with another OEM sensor and it does the same thing. It's getting the signal at the ECU.

 
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Old Aug 27, 2021 | 09:49 AM
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What code(s) are you getting?
 
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Old Aug 27, 2021 | 09:58 AM
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Originally Posted by heyyou
what code(s) are you getting?
p0335
 
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Old Aug 27, 2021 | 04:43 PM
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Wow, a weak battery, or failing starter can cause that code? Bizarre.......

Does the engine crank good? Fire right up?

Where are you testing the signal at? The sensor, or the PCM end of the harness?
 
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