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Tiny
SHAWNSAV46
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 155,000 MILES
My vehicle will not start. I have replaced the crank sensor, spark plugs and ignition coils. When that did not help I started testing the wiring to cam sensor, crank sensor, and the ignition coils. The vehicle has fuel pressure. But it does not have a signal from crank sensor, cam signal, and none of the coils has a reference pulse when cranking over the engine. I am thinking its the ECM but not sure about the variable timing sensor. Am I forgetting or do you know of any other test I have not done?
Thanks,
Shawn Savage
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Thursday, January 25th, 2018 AT 8:19 PM

1 Reply

Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
First of all, make sure you have battery voltage (twelve volts) at both sides of the PCM 1 #28 fuse in the under-hood fuse block with the key on run and start.
Also, check the PCB B #10 in that same under-hood fuse block and the ignition O #47 in the rear fuse block, located under the left rear seat.
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Friday, January 26th, 2018 AT 6:58 AM

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