AUX output not triggering FP relay

[BNR32Gojira]

Car: 89 GTR w/ NGTR+ ecu

Twin in-tank pumps, dedicated relay for each.  With both relays tapped into AUX 6, oem signal, they turn on both during initial prime and when set to test on.  Isolating each by disconnecting the relay I confirmed that each pump functions properly.  With the signal wire for pump #2 connected to AUX 3, pin 9 A/C out, I cannot get the pump to turn on with the test function turned on.  Have gone over all connections multiple times and confirmed that both pumps run fine.  Kinda stumped on AUX 3...do I need to keep signal wire to AUX 6 and connect relay ground to AUX 3?

-Matt

[Leiden]

The Aux outputs are normally ground based outputs (with the exception of Aux 5 - 8 which can be configured as high side drivers)

Check the Polarity setting for a start and confirm that you have a +12V ignition switched power source on the other side of the relay coil windings. Check the Aux output is activating in the Runtime Values, from memory it should turn green when on.

[Adamw]

3 hours ago, Leiden said:

The Aux outputs are normally ground based outputs (with the exception of Aux 5 - 8 which can be configured as high side drivers)

Most of the plug-in ecus dont have highside drives.  The polarity setting just inverts the on/off logic.

Matt, there is nothing special about Aux 3 on the GTR plug-in - it should behave as a normal aux.  To confirm wiring is correct - If you touch the wire that controls FP relay #2 to ground does the pump turn on?

 

[BNR32Gojira]

Got it sorted out.  Have both relays tied to same switched ign from oem loom, dedicated 12V w/ breaker for each from batt.  Pump #1 needs to see power for pump #2 to turn on.  Disconnected the ground for pump #1, turned on AUX 6, then turned on AUX 3 and she fired right up.

 

thanks for the reply’s