LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

How to reset PCM

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Old Jun 15, 2003 | 09:53 PM
  #1  
jchevy's Avatar
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From: Tucson, AZ
How to reset PCM

Is there a way to reset the PCM via a fuse or something instead of pulling off on of the battery cables. THis way i dont lose my radio stations and stuff.
Old Jun 15, 2003 | 10:13 PM
  #2  
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From: Little Rock, AR
Pull the PCM BATT fuse for about 15 seconds. It should be in the fuse panel on the side of the dash in your 1996.
Old Jun 15, 2003 | 10:37 PM
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Thanks

hey, have a quick question for you about a manual fan switch if you dont mind. I have a switch wired right now that i just wired into the blue wire and then to a switch and then onto a ground. The switch is just an on off switch. Is there a way for me to wire it without throwing a DTC. The diagram on your site uses the green wire too. Wiring it up the way in your diagram gives you the option of low or high speed correct? Is the green wire the low speed fans and the blue wire the high speed? If i wire in 47 ohm resistor just inline with the wire to the switch will that take care of the check engine light?

All i want to be able to do is run the high speed fans without a check engine light no LEDs or anything fancy, just on or off.

Thanks again.
Old Jun 15, 2003 | 11:08 PM
  #4  
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Originally posted by jchevy
Thanks

hey, have a quick question for you about a manual fan switch if you dont mind. I have a switch wired right now that i just wired into the blue wire and then to a switch and then onto a ground. The switch is just an on off switch. Is there a way for me to wire it without throwing a DTC. The diagram on your site uses the green wire too. Wiring it up the way in your diagram gives you the option of low or high speed correct? Is the green wire the low speed fans and the blue wire the high speed? If i wire in 47 ohm resistor just inline with the wire to the switch will that take care of the check engine light?

All i want to be able to do is run the high speed fans without a check engine light no LEDs or anything fancy, just on or off.

Thanks again.
If you only wire to the blue wire, only one fan (RH) will come on (it will be on high speed, though). Both relays must be operated for high speed operation of both fans. That is why the schematic is the way it is. Best bet is to get a DPDT switch and wire it like the diagram, but omit the LEDs and diodes if you don't want LEDs.
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