2010 LS3 Fuel Pump runs continuously (and shouldn't)
12-02-2016, 10:27 AM
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2010 LS3 Fuel Pump runs continuously (and shouldn't) Hi,
I have transplanted a 2010 Camaro LS3/TR6060 drivetrain into a 2004 BMW Z4 - think modern Cobra.
It will be California CARB/smog legal......
a couple of pictures attached.
I have it mechanically in, and reflashed enough to get it running.
Driving around the block is AWESOME ...........
Normally vehicles only enable the fuel pump for about 2-3 seconds after key is turned to "run" if the engine is not running.
The Factory Service Manual says it should do this also (and EFILive shows it should be active for only 2 secs with no CKP crankshaft sense pulse).
However -
My swap has the fuel pump running continuously when the ignition is in "run". Even if I never start it; it just follows the ignition key.
I do not have the Chevy "Fuel System Control Module", so am using the output from the Chevy ECM connector X1-50 for control.
Thru EFILive, I have tried the "F0585" (FSCM Fitted) parameter both left at default "yes", and have reflashed to "no".
note:
there appears to be a typo in my Factory Service Manual (2010 Camaro). page 9-328 schematic shows ECM K20 conn X2 pin 10 being signal 465 "Fuel Pump Relay Control". However the connector pinouts show this only for the LLT engine. (no differentiation for LS3)
so what I have used is ECM X1-50. this matches the connector pinout drawings, the color coding, and goes properly to the Forward Lamp Harness conn X102 pin 10. (schem page attached - this part is in the upper right corner)
the engine seems to run just fine, so I have to assume I am getting the proper CKP pulse to the ECM (when running).
When I use EFILive Scan, I can control the engine cooling fan relays, but I don't seem able to toggle the fuel pump as I should be. (I see and can change "Fuel Pump Duty Cycle", but the signal 465 always stays at +12 volts)
(screen shot attached)
am I using the ECM output 465 "Fuel Pump Relay Control" correctly?
what have you all done to have the proper Fuel Pump operation?
what signal are you using to control the coil for the relay?
thanks,
Ralph
I have transplanted a 2010 Camaro LS3/TR6060 drivetrain into a 2004 BMW Z4 - think modern Cobra.
It will be California CARB/smog legal......
a couple of pictures attached.
I have it mechanically in, and reflashed enough to get it running.
Driving around the block is AWESOME ...........
Normally vehicles only enable the fuel pump for about 2-3 seconds after key is turned to "run" if the engine is not running.
The Factory Service Manual says it should do this also (and EFILive shows it should be active for only 2 secs with no CKP crankshaft sense pulse).
However -
My swap has the fuel pump running continuously when the ignition is in "run". Even if I never start it; it just follows the ignition key.
I do not have the Chevy "Fuel System Control Module", so am using the output from the Chevy ECM connector X1-50 for control.
Thru EFILive, I have tried the "F0585" (FSCM Fitted) parameter both left at default "yes", and have reflashed to "no".
note:
there appears to be a typo in my Factory Service Manual (2010 Camaro). page 9-328 schematic shows ECM K20 conn X2 pin 10 being signal 465 "Fuel Pump Relay Control". However the connector pinouts show this only for the LLT engine. (no differentiation for LS3)
so what I have used is ECM X1-50. this matches the connector pinout drawings, the color coding, and goes properly to the Forward Lamp Harness conn X102 pin 10. (schem page attached - this part is in the upper right corner)
the engine seems to run just fine, so I have to assume I am getting the proper CKP pulse to the ECM (when running).
When I use EFILive Scan, I can control the engine cooling fan relays, but I don't seem able to toggle the fuel pump as I should be. (I see and can change "Fuel Pump Duty Cycle", but the signal 465 always stays at +12 volts)
(screen shot attached)
am I using the ECM output 465 "Fuel Pump Relay Control" correctly?
what have you all done to have the proper Fuel Pump operation?
what signal are you using to control the coil for the relay?
thanks,
Ralph
12-02-2016, 10:50 AM
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the stock GM harness that came with the engine.
I have spliced into the BMW stock electronics in the car, to get the ignition stuff to run to the GM fusebox.
the car runs and drives fine, the OBDII port works.
I have spliced into the BMW stock electronics in the car, to get the ignition stuff to run to the GM fusebox.
the car runs and drives fine, the OBDII port works.
12-02-2016, 01:52 PM
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It does NOT have GM Fuel Pump Control Module.
I am using the above mentioned signal to control a relay.
what signal and specifically signal # or ECM pin are you using?
I am using the above mentioned signal to control a relay.
what signal and specifically signal # or ECM pin are you using?
12-02-2016, 03:12 PM
#6
Same, dark green/white trace, pin 50, #465...
That's why I am saying you need to check the wiring further. When you turn the key on, it sounds like you are energizing the relay, or have 12 volts going to the fuel pump somehow....really hard to say without being there....just spit balling here, but somehow that pump is seeing 12volts. It's key related, as it goes away when you turn the key off...
T,
That's why I am saying you need to check the wiring further. When you turn the key on, it sounds like you are energizing the relay, or have 12 volts going to the fuel pump somehow....really hard to say without being there....just spit balling here, but somehow that pump is seeing 12volts. It's key related, as it goes away when you turn the key off...
T,
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12-02-2016, 04:50 PM
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I have checked the "no" box in EFILive that says if there is Fuel System Control Module.
It did not make a difference. (parameter F0585)
when running these tests and measuring voltage, I have disconnected the ECU output - it is not driving the relay. I am just measuring voltage.
Next step is to put a light pull down resistor (say 5k) to ensure that the signal is not just floating to +12, but is actively being driven.
I will also recheck my wiring to ensure that I am on the right pin from the ECU.
It did not make a difference. (parameter F0585)
when running these tests and measuring voltage, I have disconnected the ECU output - it is not driving the relay. I am just measuring voltage.
Next step is to put a light pull down resistor (say 5k) to ensure that the signal is not just floating to +12, but is actively being driven.
I will also recheck my wiring to ensure that I am on the right pin from the ECU.
12-03-2016, 09:15 PM
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well......
good news.
I spent today ripping out a lot of the BMW wiring, and simplifying.
then I put a new relay in.
and now it works!!!!
so obviously something I had done was not quite correct.
thanks for the help, I am back in business again!
good news.
I spent today ripping out a lot of the BMW wiring, and simplifying.
then I put a new relay in.
and now it works!!!!
so obviously something I had done was not quite correct.
thanks for the help, I am back in business again!
