A couple of wiring questions...
04-21-2009, 01:03 PM
#1
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A couple of wiring questions... In the middle of a wiring mess, and have a couple questions.
On a 2000 f body ecu....red plug pin #30 is "Anti-theft fuel enable". To bypass this, do I need to set the #30 pin directly to ground, or positive voltage..or??
Blue Plug # 46 is "Tank Pressure 5-volt reference"
Blue Plug # 23 is "Tank Pressure sensor ground"
Red Plug # 64 is "Tank Pressure sensor signal"
Using the above 3 wires, how can I send a "fake" signal back to the ecu? I need to keep this circuit active for emissions testing-related issues on a swap that I'm in the middle of.
Thanks in advance for any suggestions.
On a 2000 f body ecu....red plug pin #30 is "Anti-theft fuel enable". To bypass this, do I need to set the #30 pin directly to ground, or positive voltage..or??
Blue Plug # 46 is "Tank Pressure 5-volt reference"
Blue Plug # 23 is "Tank Pressure sensor ground"
Red Plug # 64 is "Tank Pressure sensor signal"
Using the above 3 wires, how can I send a "fake" signal back to the ecu? I need to keep this circuit active for emissions testing-related issues on a swap that I'm in the middle of.
Thanks in advance for any suggestions.
04-22-2009, 01:09 AM
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Not sure on the fuel enable, but you can try either high or low and see what happens...
For the tank pressure, you will most likely need to use a voltage drop from the 5v reference to keep it happy, sending it down the signal wire is my guess. It needs to be in a particular range obviously, so you'd need to try varying resistance values. The easiest way to do that would be to use a potentiometer and dial it around to see if you can keep it from throwing a code. Then measure that resistance value and get the appropriate value of resistor and hard wire it in, in place of the pot.
I am just guessing here and shooting from the hip. Hopefully someone else can chime in here and give you better info.
For the tank pressure, you will most likely need to use a voltage drop from the 5v reference to keep it happy, sending it down the signal wire is my guess. It needs to be in a particular range obviously, so you'd need to try varying resistance values. The easiest way to do that would be to use a potentiometer and dial it around to see if you can keep it from throwing a code. Then measure that resistance value and get the appropriate value of resistor and hard wire it in, in place of the pot.
I am just guessing here and shooting from the hip. Hopefully someone else can chime in here and give you better info.
04-22-2009, 03:44 AM
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Not sure on the fuel enable, but you can try either high or low and see what happens...
For the tank pressure, you will most likely need to use a voltage drop from the 5v reference to keep it happy, sending it down the signal wire is my guess. It needs to be in a particular range obviously, so you'd need to try varying resistance values. The easiest way to do that would be to use a potentiometer and dial it around to see if you can keep it from throwing a code. Then measure that resistance value and get the appropriate value of resistor and hard wire it in, in place of the pot.
I am just guessing here and shooting from the hip. Hopefully someone else can chime in here and give you better info.
For the tank pressure, you will most likely need to use a voltage drop from the 5v reference to keep it happy, sending it down the signal wire is my guess. It needs to be in a particular range obviously, so you'd need to try varying resistance values. The easiest way to do that would be to use a potentiometer and dial it around to see if you can keep it from throwing a code. Then measure that resistance value and get the appropriate value of resistor and hard wire it in, in place of the pot.
I am just guessing here and shooting from the hip. Hopefully someone else can chime in here and give you better info.
Thanks for the reply
