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Got a 2000 gmc 454 w a no start condition

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got a 2000 gmc 454 w a no start condition
Submitted: 2 years ago.Category: Chevy
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Customer reply replied 2 years ago
unit will crank for about 5 secs and relay kicks out and it quits turning over.we hav checked and have no spark.we sent pcm out and had it tested to come back ok.we have power to pink wires at the coil packs.we have replaced crank sensor and ohm wires to pcm. cam sensor distributor turns.fuel pump works.
Answered in 23 minutes by:
4/30/2015
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 2 years ago
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15,201
Experience: GM Grand Master Technician 2007. 14 years experience.
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Hi there, I am Cam. When you try to start, can you spray fuel in the throttle body and does it start?
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Customer reply replied 2 years ago
have no spark. i have read alot online about crank position sensor
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 2 years ago
The crank sensor is VERY common. Let me ask this, have you checked spark out of the coil or just at the wires/plugs??
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Customer reply replied 2 years ago
both.this has coil packs.
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 2 years ago
Ok, so at the crank sensor, do you have power on 1 wire and ground on another?
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Customer reply replied 2 years ago
yes we do.
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 2 years ago
Dont suppose you have a scanner that can view live data?
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Customer reply replied 2 years ago
yes and i have.i can c tps, coolant temp but no rpm while cranking.is the crank sensor adjustable. i notice to screws. one to hold it and one to go up and down maybe
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 2 years ago
No it should not be.
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Customer reply replied 2 years ago
scanner is not showing any rpm
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 2 years ago
Replace your crank sensor next and see what happens.
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Customer reply replied 2 years ago
we have replaced it.and check wheel for loosness and it turning
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 2 years ago
Ok, Broken wiring between the sensor and the ECM?
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Customer reply replied 2 years ago
no we have ohm them and put a load on them
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 2 years ago
OK, any loose pins at the ECM or the crank sensor?
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Customer reply replied 2 years ago
no no loose pins. any other sensors that would tell unit to have no spark. we have been thru schamatics. checked powers and grds to ecm also.thats why we removed pcm sent it out and it tested ok. i still not convinced it is ok
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 2 years ago
Trying to pull the GM manuals, what is the Vin?
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Customer reply replied 2 years ago
1GDM7H1B8YJ520234
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 2 years ago
Ok, what happens if you unplug the cam sensor? Do you get spark?
Also what is the RPM with the scanner, IAT, TPS voltage, ECT?
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Customer reply replied 2 years ago
ok unpluged cam sensor and no spark. to make sure i am right the cam sensor is in the look alike distributor correct? im showing no rpm on scanner. ECT is 59. IAT is 63. i cant see tps voltage but can watch the percentage go from 14.5 to 100. O2 sensors. voltage i can c and its .445 . i also read about a TAC module behind glove box.what is that. to make sure u know this is a gmc c7500 medium duty truck
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 2 years ago
Yes, I was able to find that with the vin which helps. So no RPM signal makes me think wiring or PCM. The crank sensor is monitored directly by the PCM.
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Customer reply replied 2 years ago
is there a reading or voltage return signal to the ecm that i can back probe it at ecm to c if its gettn there from the crank sensor. i would need the pin out locations. c we have worked on this unit a while then sat a while and now im on it again. we r a big guard rail company with alot of gmcs but this is only one like this and this year.we sent pcm out and was tested ok but like i said im not convinced.
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 2 years ago
Actually its a frequency sent back. I would back probe the dark blue white in the red connector pin 44.
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Customer reply replied 2 years ago
what r the other 2 pins for the crank sensor at the pcm. i would like to check the wires again. we had to return the manual we was borrowing. and do u have any other suggestions. or even know where we cold get a good pcm to try on unit
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GM Tech (Cam)
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
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Experience: GM Grand Master Technician 2007. 14 years experience.

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