PCM's use of B2 Fuel Pump Signal
03-26-2012, 02:48 PM
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Car: '87 Camaro
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PCM's use of B2 Fuel Pump Signal
I was wondering how the PCM used the fuel pump signal that it recieves from the B2 pin on a 7747. Does it just check to see that it is working (on/off), or does it use the voltage to correct fuelling?
I ask because I had added a fuel pump relay to the rear of the car when I moved the battery to the trunk, so now the PCM only sees the relay's voltage, not the pump's. I just need to know if I should run a wire back so the PCM gets the reference voltage it may or may not need.
Thanks in advance.
I ask because I had added a fuel pump relay to the rear of the car when I moved the battery to the trunk, so now the PCM only sees the relay's voltage, not the pump's. I just need to know if I should run a wire back so the PCM gets the reference voltage it may or may not need.
Thanks in advance.
03-26-2012, 07:04 PM
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Re: PCM's use of B2 Fuel Pump Signal
It is used for the fuel pump relay malfunction diagnostic routine and for the voltage compensation of the injector PW.
RBob.
RBob.
03-26-2012, 07:18 PM
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Re: PCM's use of B2 Fuel Pump Signal
Thank you. That's just what I was looking for. I just wanted to make sure of this before I took the time run the wire.
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