NO POWER TO CRANK AND CAM SENSOR

  • Tiny
  • Speedy8305
  • 1996 Chevrolet S-10
  • 67,000 miles

When tried to start the vehicle I got no spark after testing all sensors and coil packs I found no power to crank and cam sensors tested pcm plug found power to some wires tested ground at plug found other wires were ground. Which wires should be power and which should be ground?

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Sunday, October 9th, 2011 AT 6:05 PM

30 Replies

  • Tiny
  • JDL
  • Expert
  • 16,289 posts

At the cam sensor, pink wire is ignition feed, comes from engine fuse 5-- 20 amp in fuse box. Circuit goes hot when you turn on the key. Use a voltage tester at the fuse, with key on, anything?

You may have to check feed to and from ignition switch, Including the ignition switch.

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Sunday, October 9th, 2011 AT 6:19 PM
  • Tiny
  • Speedy8305
  • Member

I checked all fuses got good voltage have good ground to cam and crank plug but have no power to either plug tested the pcm plug couldnt which socket in the plug has to have power at it

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Sunday, October 9th, 2011 AT 6:57 PM
  • Tiny
  • JDL
  • Expert
  • 16,289 posts

What is litre size of engine and vin? I looked at 4.3 vinW. Check splice 123, wiring harness near distributor. Should be same color wire already mentioned.

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Sunday, October 9th, 2011 AT 7:20 PM
  • Tiny
  • Speedy8305
  • Member

Im sorry its a 2.2 4 cyl no distributer only coil packs and they all checked out good, all new wires and plugs got power to pcm plug but no power to cam and crank sensor unless I jump the power from the battery buit still get no fire

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Sunday, October 9th, 2011 AT 8:18 PM
  • Tiny
  • Speedy8305
  • Member

Also plugged in scan tool vechicle passed with no codes but all dash light(ses, airbag, check guages, battery and abs lights all on recently changed the ecm as well if that helps any

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Sunday, October 9th, 2011 AT 8:22 PM
  • Tiny
  • Speedy8305
  • Member

Its a 2.2l the vin is i
1gccs1442t8212298

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Sunday, October 9th, 2011 AT 8:38 PM
  • Tiny
  • JDL
  • Expert
  • 16,289 posts

That voltage comes from pcm. Check power and grounds in the diagram.
A new pcm may need to be programed.

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Sunday, October 9th, 2011 AT 8:45 PM
  • Tiny
  • JDL
  • Expert
  • 16,289 posts

Note cam/crank sensor power.

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Sunday, October 9th, 2011 AT 8:49 PM
  • Tiny
  • Speedy8305
  • Member

Is that schem for the pcm or the ecu?

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Sunday, October 9th, 2011 AT 8:53 PM
  • Tiny
  • Speedy8305
  • Member

I located the cam and crank sensor wire and removed a piece of insulation and found no power to the wire whether key was on or off

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Sunday, October 9th, 2011 AT 8:56 PM

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