2005 Impala Crank Sensor Code P0335 From A Shorted Cam Sensor

What do you do when the flow chart leads you to engine computer replacement? Think outside the box! This case study emphasizes why I think manufacturer flow charts are misleading, and shows what tests you can do to avoid replacing a computer for nothing.

Engine Performance Diagnostics chapter 21

Symptoms
check engine light (P0335, P0520)
long crank time
starting fluid required to start, especially cold

Fix
repaired camshaft position sensor wiring
replaced the camshaft position sensor

Tests shown
understanding GM 7X and 24X crankshaft position sensors
how to test a three wire pull-up hall effect sensor and wiring
how to perform a short to ground test with a ohm meter
using a wiring diagram to identify computer power and ground circuits
understanding internally sourced/externally separate PCM voltage feed circuits
how to disassemble a camshaft position sensor connector and repair bare wires

Tools used
scan tool
lab scope
heat shrink/electrical tape/conduit

Playlist
(Chapter 21) Ignition inputs, cam and crank sensors
   • (Chapter 21) Ignition inputs, cam and...  

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No Start from a shorted MAP sensor (Honda, Acura)
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How to test an electronic EGR valve (GM P1406 case study)
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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
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