HFS-6 brown wire fail safe question

[Richard L]

You can do this by grounding the black wire and the brown wire to the failsafe pin.
MAKE SURE the DR is linked to DR0.

[Team Scream]

Originally Posted by Richard L

You can do this by grounding the black wire and the brown wire to the failsafe pin.
MAKE SURE the DR is linked to DR0.

So you are saying join the black and brown together and solder them to the orange wire (test mode connector +) at the ecu? That seems like a loop will be created. The black is listed as normally closed and the brown is listed as normally open

[Team Scream]

Originally Posted by Team Scream

So you are saying join the black and brown together and solder them to the orange wire (test mode connector +) at the ecu? That seems like a loop will be created. The black is listed as normally closed and the brown is listed as normally open

Ok, Richard, you need to do whatever you can to keep Mr. Jeff Howerton happy. This guy is a true asset to your enterprise sir. For him to give me a call back on a Friday night at the beginning of a holiday weekend speaks volumes to his customer service skills. I will be a customer for life when you have guys like Jeff on your team sir.

Anyway, the correct answer to this problem is the following:

White wire to ground.
Black wire (N/O) to B135 Pin B27

B135 Pin B27 (2006 Subaru WRX) is the ONLY ORANGE wire on that connector. It is the pin on the ECU that gets grounded when you connect the green test mode connectors under the dash to flash a new map or reset the ECU.

The beauty of using that circuit as a fail safe trigger input is that it does multiple things to protect the engine in the event of a malfunction.

(1) It drops boost to wastegate pressure only.
(2) It triggers a CEL
(3) It drops timing to (IAM=.5) which basically cuts timing across the board to 1/2 of the values in the timing table(s).

For me, this is the best possible way to set up a system for total engine protection. As I sated earlier, when something goes wrong, I want to STOP everything, diagnose the problem and solve it BEFORE getting back to full power, boost and timing.

When I had this system set up in my 2006 WRX with a complete STi swap, I was making 425 AWHP and the system worked FLAWLESSLY.

Thanks.

[Richard L]

Originally Posted by Team Scream

Ok, Richard, you need to do whatever you can to keep Mr. Jeff Howerton happy. This guy is a true asset to your enterprise sir. For him to give me a call back on a Friday night at the beginning of a holiday weekend speaks volumes to his customer service skills. I will be a customer for life when you have guys like Jeff on your team sir.

Anyway, the correct answer to this problem is the following:

White wire to ground.
Black wire (N/O) to B135 Pin B27

B135 Pin B27 (2006 Subaru WRX) is the ONLY ORANGE wire on that connector. It is the pin on the ECU that gets grounded when you connect the green test mode connectors under the dash to flash a new map or reset the ECU.

The beauty of using that circuit as a fail safe trigger input is that it does multiple things to protect the engine in the event of a malfunction.

(1) It drops boost to wastegate pressure only.
(2) It triggers a CEL
(3) It drops timing to (IAM=.5) which basically cuts timing across the board to 1/2 of the values in the timing table(s).

For me, this is the best possible way to set up a system for total engine protection. As I sated earlier, when something goes wrong, I want to STOP everything, diagnose the problem and solve it BEFORE getting back to full power, boost and timing.

When I had this system set up in my 2006 WRX with a complete STi swap, I was making 425 AWHP and the system worked FLAWLESSLY.

Thanks.

Jeff is the only dealer who offer true technical support, I value this very much. Thanks for highlighting this on your post.

Start again:

DR= DR0
White wire to test mode
Black wire to ground

or

DR = DRO
Black wire to test mode
White wire to ground

The HFS6 does not have an orange wire.

[Team Scream]

Originally Posted by Richard L

Jeff is the only dealer who offer true technical support, I value this very much. Thanks for highlighting this on your post.

Start again:

DR= DR0
White wire to test mode
Black wire to ground

or

DR = DRO
Black wire to test mode
White wire to ground

The HFS6 does not have an orange wire.

Thank you Richard,

What is DR=DRO ? I am confused with that line.

The orange wire is not on the HFS-6 but rather is the wire on the Subaru ECU that is used to ground the green test mode connection signal the ECU receives when you plug the green test mode connectors together.

My observations indicate that when the white wire is grounded, and the system is NOT energized (power off or switch on the gauge is off) the black wire is also grounded. It is only when the system is energized and the switch on the gauge is depressed that the circuit switches open. This is a problem when first starting the car. It triggers a CEL when starting the car some times.

What I really need for this to be perfectly effective, is a circuit that is OPEN at all times UNLESS the fail safe is TRIGGERED. The only time that circuit should be closed (grounded) is when the system triggers fail safe, or the HFS-6 is switched off at the gauge.

[Richard L]

Originally Posted by Team Scream

So you are saying join the black and brown together and solder them to the orange wire (test mode connector +) at the ecu? That seems like a loop will be created. The black is listed as normally closed and the brown is listed as normally open

No and No.

I made a mistake. start aqain,
black wire to ground and white wire to the failsafe pin of your equipment (green connector).

Orange wire is not used

make sure DR0 is set.