Awd Swap Fuel Pump Problem

[phizzalot]

Hello all,

I completed bolting up all the parts from a 1996 Talon Tsi for an AWD swap on a 1997 Galant.

I have followed the steps to swap to a 2g ecu from a 1999 GSX and rewired my galant harness to match the 2g pinout.

When I turn the ignition to the "ON" position the fuel pump turns on and stays on. The Galant has 5 wires for the fuel pump and I used the diagram from the AWD/merged thread here to rewire it. My fuel gauge is working and the remaining wires voltage are below.

Blk/blue stripe 11v ( battery is low )
yellow /green stripe 11v (battery is low)
yellow = 6v (???)

I haven't tried to crank the car yet but wanted to fix this before moving forward.

I was wondering if anyone here had any methods for trouble shooting this.

 

[steve]

As I mentioned before, try disconnecting the ECU to see if it or the re-wiring is causing the fuel pump to run. I don't have a 97 Galant manual here so I can't check the wire colors you listed.

If the pump still runs for a long as the ignition is on with the ECU out you'll know where to look next.

 

[phizzalot]

Thanks, I unplugged the ecu and the pump didn't come on at all. I also did the fuel pump rewire with 30am relay and the pump also does not come on . I plug in the ecu and the pump comes on and stays on when the ignition is in the on position.

Not sure what to do from here, maybe trying a different ecu.

 

[steve]

Verify the correct wiring of the ECU connector since people often get confused by the pin numbers when they look at the connectors. Pin 8 is pulled low by the ECU to activate the fuel pump, you don't account for how the pins are numbered when you flip the connector over you could have the MPI relay connected to the EGR pin.

It's also possible that your ECU is damaged but check the wiring first.

http://www.dsmtuners.com/forums/articles-tuning-ecu/246467-how-identify-ecu-pin-numbers.html

 

[99gst_racer]

Is it even an issue to have the pump running with the ignition in the OK position? Aren't all 1G's like that?

 

[steve]

Is it even an issue to have the pump running with the ignition in the OK position? Aren't all 1G's like that?

Nope, that's not intended. The 1G is designed to tun the pump on either when cranking (input is from the starter solenoid) or when the ECU sees the CAS turning. The first turn the pump off as soon as you release the key in the start position, the second about 10 seconds after the last CAS pulse.

The reason we believe some DSM's turn the pump on when the ignition turn on is due to the CAS signal glitching on power up triggering the ECU into the 10 second run of the pump.

In this case the key that driving my though process is the statement "When I turn the ignition to the "ON" position the fuel pump turns on and stays on" which shouldn't happen at all. The pump should turn off even if it was due to a glitch.

 

[Technoklipz]

Make sure that the pin is not grounded to the car. If it is then the pump will run all the time while the key is in the ignition and the ecu is plugged up. The wire would typically not be grounded to the car but only to the ecu. I forget which pin it is but it can be found in the wiring diagrams.

 

[steve]

Make sure that the pin is not grounded to the car. If it is then the pump will run all the time while the key is in the ignition and the ecu is plugged up. The wire would typically not be grounded to the car but only to the ecu. I forget which pin it is but it can be found in the wiring diagrams.

The test with the ECU removed eliminated the possibility that it was due to a wiring short. If it had continued without the ECU installed it might have been the cause.

 

[phizzalot]

Yep I verified that wire is blk/blue stripe with the same thickness that's back at the fuel pump.I actually did not have to swap/move this pin from orginal harness because its the same on the 7g.

Only had to move the following
* *Yel/blue wire * Pin 1 to 14 (injector 1)
* *Blue/green *Pin 2, is moved to Pin 1 (injector 3)
* *Lt Green/White *Pin 15, is moved to Pin 2 (injector 4)
* *Yel/Black *Pin 14 moved to Pin 15 (injector 2)
* Move White wire Pin 31 to pin 58. (Tach signal wire)
*White wire Pin 31 moved to pin 58 (Engine Ignition Signal)

When inspecting the ecu, if there is clear resin over the microchip's, is that an indicaton that its faulty?

 

[Technoklipz]

It indicates that the board has gotten hot enought to melt part of the resin but may be ok. Check for any breaks, burnt spots, or blown capacitors. These are obvious things and if you don't see them then your ecu might be ok. If you have doubts, post a couple pics here and we can check for you. The pics must be of good resolution and quality. Good luck.

 

[phizzalot]

Problem Resolved!!!!!

So for anyone seeing this in the future. My issue was that the second wire that connects to the starter was not plugged in (DOH).

I double checked this by pulling that little blk clip/wire that goes to the strater and turning the ignition to "ON" ( Fuel Pump stays on). Attached that blk clip/wire to starter and fuel pump is off when the ignition is at "ON" position. Also the fuel pump turns on when cranking so all looks well

Thanks Wisemen and everyone else for the help!!!

 

[Technoklipz]

Glad to hear you figured it out.