Whats the crank fuse do? - S-10 Forum
 
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post #1 of 15 Old 02-06-2011, 05:44 PM Thread Starter
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Whats the crank fuse do?

Okay so I was checking for power on all fuses and everything checked out except the crank fuse :/ What does it do and do you know where the wires go and come from?

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post #2 of 15 Old 02-06-2011, 07:10 PM
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Re: Whats the crank fuse do?

It sends a crank signal to the ECM, while the key is in the start position.

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Tha toy: 1973 Datsun 240z 12.71 @115
Typhony Old set-up: 1985 GMC Jimmy. 3.2L Turbocharged/Intercooled hybrid. 13.873 @ 99.08 Currently being reconstructed.


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post #3 of 15 Old 02-08-2011, 02:07 PM Thread Starter
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Re: Whats the crank fuse do?

So if there is no power to the fuse it wont start?
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post #4 of 15 Old 02-08-2011, 03:50 PM
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Re: Whats the crank fuse do?

the motor cranks right? And it says a fuse amperage right? So put a fuse according to the amperage in there and see what happens. Thats all that I can really say.

Not only that you might have some electrical issues.
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post #5 of 15 Old 02-08-2011, 06:46 PM
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Re: Whats the crank fuse do?

The CRANK fuse will only have power when the engine is cranking(start portion of ignition switch).
Power flows through the ignition switch in the start position, through the neutral switch(manual)to the starter and crank fuse then to the ECM from the crank fuse.
It is a 5A fuse in the fuse block.


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1989 Chevrolet Blazer 4.3 4x4
1989 Chevrolet Blazer 4.3 Edelbrock equipped
2003 Chevrolet S10 4.3
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post #6 of 15 Old 02-08-2011, 07:37 PM
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Re: Whats the crank fuse do?

Powers the solenoid on the starter when key is held to start. Fuse blown, no power to coil on starter solenoid.

Sensor Resistance Chart -> http://www.s10forum.com/forum/attachments/f107/98606d1222052466-little-help-needed-gm-sensor-chart.gif
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post #7 of 15 Old 02-09-2011, 09:30 AM
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Re: Whats the crank fuse do?

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Originally Posted by lesterl View Post
Powers the solenoid on the starter when key is held to start. Fuse blown, no power to coil on starter solenoid.

Uhh, no.

It is simply a connection, split off from the starter wire from the ignition switch that connects to an ECM input. The truck will still crank without that fuse, just the ECM doesn't use the start tables when that is not enabled and may have difficulty starting.

'Bu: The daily driver
Tha toy: 1973 Datsun 240z 12.71 @115
Typhony Old set-up: 1985 GMC Jimmy. 3.2L Turbocharged/Intercooled hybrid. 13.873 @ 99.08 Currently being reconstructed.


"If you're not living on the edge, You're taking up too much space."
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post #8 of 15 Old 02-09-2011, 05:40 PM
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Re: Whats the crank fuse do?

Raven, my bad, I've been over my schematics so much I could have sworn I have seen that in the ign circuit feed, went and checked, the only thing I have is a schematic of it in the block but they dont show where it goes, Guess with a 3 amp fuse it wouldnt be a solenoid fuse anyway......

AFAIK, the ICM has built in start tables and when it detects the engine fire it hands over control of the ignition to the ECM..... AFAIK....... But I dont know about fuel control either.

Sensor Resistance Chart -> http://www.s10forum.com/forum/attachments/f107/98606d1222052466-little-help-needed-gm-sensor-chart.gif
1997 Venture 3.4l Auto / 2006 Malibu Maxx 3.5l Auto / 1995 Tahoe 5.7l TBI Auto / 1998 GMC Sierra Z71
Will have another S10 one day.... Anyone have a freebie? :-)
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post #9 of 15 Old 02-09-2011, 06:02 PM
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Re: Whats the crank fuse do?

The ICM doesn't have any "tables" built into it, though there is some measurable latency that varies with RPM an is different between different ICMs.

It is actually the ECM that sends a signal to the ICM for it to take over timing control, this is a 5V signal applied to bypass wire to allow the ESC signal to become active.

Some MS users have played with having the 5V signal active as soon as the key is turned on, to be able to adjust spark timing during cranking, with some success.

'Bu: The daily driver
Tha toy: 1973 Datsun 240z 12.71 @115
Typhony Old set-up: 1985 GMC Jimmy. 3.2L Turbocharged/Intercooled hybrid. 13.873 @ 99.08 Currently being reconstructed.


"If you're not living on the edge, You're taking up too much space."
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post #10 of 15 Old 02-09-2011, 07:14 PM
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Re: Whats the crank fuse do?

Cool....

Sensor Resistance Chart -> http://www.s10forum.com/forum/attachments/f107/98606d1222052466-little-help-needed-gm-sensor-chart.gif
1997 Venture 3.4l Auto / 2006 Malibu Maxx 3.5l Auto / 1995 Tahoe 5.7l TBI Auto / 1998 GMC Sierra Z71
Will have another S10 one day.... Anyone have a freebie? :-)
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post #11 of 15 Old 02-09-2011, 07:53 PM
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Re: Whats the crank fuse do?

I will post a nice schematic from Mitchell in a bit.


1989 Chevrolet Blazer 3.4
1989 Chevrolet Blazer 4.3 4x4
1989 Chevrolet Blazer 4.3 Edelbrock equipped
2003 Chevrolet S10 4.3
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post #12 of 15 Old 02-09-2011, 08:54 PM
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Re: Whats the crank fuse do?

Cool, mine suck.....

Sensor Resistance Chart -> http://www.s10forum.com/forum/attachments/f107/98606d1222052466-little-help-needed-gm-sensor-chart.gif
1997 Venture 3.4l Auto / 2006 Malibu Maxx 3.5l Auto / 1995 Tahoe 5.7l TBI Auto / 1998 GMC Sierra Z71
Will have another S10 one day.... Anyone have a freebie? :-)
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post #13 of 15 Old 02-09-2011, 09:03 PM
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Re: Whats the crank fuse do?

This is the starting system diagram for an 1988 S10(random choice).


1989 Chevrolet Blazer 3.4
1989 Chevrolet Blazer 4.3 4x4
1989 Chevrolet Blazer 4.3 Edelbrock equipped
2003 Chevrolet S10 4.3
1999 Chevrolet S10 Xtreme 2.2
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post #14 of 15 Old 05-18-2016, 11:56 AM
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Re: Whats the crank fuse do?

Quote:
Originally Posted by umskittles View Post
Okay so I was checking for power on all fuses and everything checked out except the crank fuse :/ What does it do and do you know where the wires go and come from?
I have a chevy cavalier 2002. Upon backing into my driveway the engine shut off. The gear shift locked in park. When I tried to start the car nothing happened except the dash went dark. When I turned the key to just on, everything came on on the dash however when starting the engine never cranked. We looked at all the fuses, and saw where the crank fuse #360 was, however the car has new battery and was running fine before I got home. What does the crank fuse do and if it is not any good is that the reason the engine will not even crank? Just some low clicking but no crankingl
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post #15 of 15 Old 05-19-2016, 12:22 AM
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Re: Whats the crank fuse do?

Quote:
Originally Posted by pam11498 View Post
I have a chevy cavalier 2002. Upon backing into my driveway the engine shut off. The gear shift locked in park. When I tried to start the car nothing happened except the dash went dark. When I turned the key to just on, everything came on on the dash however when starting the engine never cranked. We looked at all the fuses, and saw where the crank fuse #360 was, however the car has new battery and was running fine before I got home. What does the crank fuse do and if it is not any good is that the reason the engine will not even crank? Just some low clicking but no crankingl
You'll be better off getting information from a Cavalier forum than here, because the crank fuse in an S10 serves a different purpose than the crank fuse in a Cavalier.

'Bu: The daily driver
Tha toy: 1973 Datsun 240z 12.71 @115
Typhony Old set-up: 1985 GMC Jimmy. 3.2L Turbocharged/Intercooled hybrid. 13.873 @ 99.08 Currently being reconstructed.


"If you're not living on the edge, You're taking up too much space."
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