PCM 42 ecu pinout grounding question(2000 silverado)
03-19-2014, 09:42 PM
#1
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PCM 42 ecu pinout grounding question(2000 silverado) I got my pin in the ecu, i started the truck and i was testing to make sure the ecu sent out the ground signal. Well it grounded out at like 180/181degrees, But when it was grounding out, it wasnt a steady ground, it was like it was beeping......(beep......beep....beep) it was never a steady ground. Wouldnt that in turn keep kicking on and off that relay and possibly burn it up ?
03-20-2014, 10:42 PM
#4
2000 trucks didn't come with correct fan settings from factory. You need to adjust them in the tune to get correct fan operation.
Even if you install the pin in the correct location, there are tuning changes that need to be made. Post your current tune to check it
Even if you install the pin in the correct location, there are tuning changes that need to be made. Post your current tune to check it
03-23-2014, 03:38 PM
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Sorry, yes it has been tuned for the Efan option. Fans should turn on at 180degrees.
I have no doubt in the tuners abilities he has done MANY trucks and done very good job.
But its like its pulsing.
I have no doubt in the tuners abilities he has done MANY trucks and done very good job.
But its like its pulsing.
03-24-2014, 01:45 PM
#7
Did you connect a relay to test it?
Pcm outputs are solid state, they are not like a true on/off switch
Hook a relay and wire the actual fan to test how it works.
Some 2000 truck operating systems don't have the correct fan logic and you need to flash a newer os, but first hook the fan to test what it does
Pcm outputs are solid state, they are not like a true on/off switch
Hook a relay and wire the actual fan to test how it works.
Some 2000 truck operating systems don't have the correct fan logic and you need to flash a newer os, but first hook the fan to test what it does
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03-24-2014, 05:19 PM
#8
Did you connect a relay to test it?
Pcm outputs are solid state, they are not like a true on/off switch
Hook a relay and wire the actual fan to test how it works.
Some 2000 truck operating systems don't have the correct fan logic and you need to flash a newer os, but first hook the fan to test what it does
Pcm outputs are solid state, they are not like a true on/off switch
Hook a relay and wire the actual fan to test how it works.
Some 2000 truck operating systems don't have the correct fan logic and you need to flash a newer os, but first hook the fan to test what it does
03-24-2014, 11:48 PM
#10
i have not verified with the owner. But it may be a bad relay or connection for the fan to be modulating on and off. I've made these settings work on several 2000 OS, but you may be right and maybe this specific truck OS gets quirky with the updated settings. If that's the case and the owner has verified the hardware, I can flash another 00 OS.
You won't see a groud like you are expecting. Hook a relay and test if it clicks or not. You can use a small light bulb also
03-25-2014, 12:06 AM
#11
ur problem is your ecu, change it out to a 2001-2 0411 ecu (red/blue ) and put all your fan on/off settings to 180/170. and please fix your spark tables and transmission tables.
03-25-2014, 03:01 AM
#12
No need to change the PCM, much older PCMs are capable of controlling dual fans. This one only needs to be flashed with a 02 OS if the relay test shows the need to do it
03-25-2014, 09:18 AM
#13
i know you can but they are known to have problems when reflashing to an 01-02 os. 60 dollar ecu can fix that problem.
03-25-2014, 08:35 PM
#14
I have flashed a lot of 99-00 PCMs to 02 operating systems and never had a problem.
I even tried to brick a few (on purpose, since I can easily repair them) flashing a car OS in truck PCM and viceversa, never could brick a single one with any year/model combination. These PCMs are very forgiving. Even 03-06 1MB PCMs are very reliable.
You just need to find the OS which suits your needs and never mix 512KB with 1MB flashes
I even tried to brick a few (on purpose, since I can easily repair them) flashing a car OS in truck PCM and viceversa, never could brick a single one with any year/model combination. These PCMs are very forgiving. Even 03-06 1MB PCMs are very reliable.
You just need to find the OS which suits your needs and never mix 512KB with 1MB flashes
03-25-2014, 09:45 PM
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Well i tested the fans. The relay setup i have is a 3relay setup. They came on like they should, but the relay was a constantly clicking. I figured it would give a constant ground ?
My tuner set the fans to come on at 180/181, with the clutch fan always going my temps never get above 199/201ish. I should expect the same with the efans to correct ?
http://imgur.com/MHkg8wo
My tuner set the fans to come on at 180/181, with the clutch fan always going my temps never get above 199/201ish. I should expect the same with the efans to correct ?
http://imgur.com/MHkg8wo
03-25-2014, 11:33 PM
#16
The relay must only enable and disable, it should not click constantly.
Use this settings and test.
This settings are from a 2000 truck I converted to electric fans and they worked good.
You can modify the temp settings later but for the moment use this settings exactly as the picture and test
Use this settings and test.
This settings are from a 2000 truck I converted to electric fans and they worked good.
You can modify the temp settings later but for the moment use this settings exactly as the picture and test