12
Main harness 25 Pin D Sub
Black 20 gauge (computer ground). Ground to aircraft structure or ground strip close to the EM-5.
Important! Makes sure this connection is good.
Red 20 gauge ECU power. Switched 12V. Fused with 2 to 5 Amp fuse.
Important! Makes sure this connection is good.
Plug in the mixture knob, white 3 pin plug.
Green 20 gauge, pin 12: This supplies a 5V tach signal output to your tach or EIS.
Yellow 20 gauge, pin 22: This supplies a 12V tach signal output to your tach or EIS.
Gray 20 gauge and O2 sensor or Wideband meter hookup, pin 24
On the SDS main harness there is a single gray 20 gauge wire which you can connect to a wideband
O2 sensor controller. Connection is required when you want to display the AFR (air/fuel ratio) in the
SDS programmer or use Closed loop and Lean Warning functions in the SDS computer. The SDS can
run without an O2 sensor if this is desired but a wideband should be used to accurately tune the
system. Recommended Wideband O2 air/fuel sensor & controller is the AEM #30-0310.
AEM hookup to SDS is as follows:
AEM Red to switched 12V through 5A breaker or fuse.
AEM Black to ground buss or chassis ground.
AEM White to SDS main harness gray wire.
AEM Brown connect to same place as SDS ECU pin 18 ground wire.
Mounting the AEM O2 sensor, mount sensor minimum 12 inches from the exhaust port, and minimum
12 inches from exhaust tip. Sensor may overheat too close to port, and may pickup air when too close
to exhaust tip.
TPS (throttle position sensor signal) On dual ECU 4cyl systems you will only connect the TPS to the
Primary ECU while the backup ECU will not need any connection to the TPS. On Dual 6 cylinder
systems, the orange wire from the backup ECU harness will connect to the white TPS wire on the
primary ECU.
Purple and brown wires are for future use and not connected at this time.
Hall sensor 9 pin D Sub
Plugs into the middle DB-9 port on the ECU. On Dual ECU systems, the primary harness and Hall
sensor cable is color coded green and the backup ones are color coded red.
DB-9 Pin#, function, Tefzel cable color:
5, +5V, orange stripe
4, Trigger, solid white
3, Ground, blue stripe
8, Sync signal, green stripe.
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