Buell ECM

The Buell DDFI-2 Engine Control Module (ECM) fitted to XB9 and XB12 models from 2003 to 2007 connects via two 12-pin Deutsch DT sockets: a black socket (DT06-12SB) carrying power, ground, and output signals, and a gray socket (DT06-12SA) carrying sensor inputs and serial communications. Both sockets are located under the seat on most XB variants. ECM serial communication operates at TTL voltage levels (0–5 V), not standard RS-232 (±12 V); applying standard RS-232 directly to the diagnostic port risks ECM damage. The DDFI-3 generation (2008–2010 XB and 1125R models) uses a different connector family — two 34-pin AMP Superseal 1.0 mm sockets — and is not covered by this pinout.

Notes

• The black socket (DT06-12SB) carries switched +12 V ignition power, ECM ground, and all actuator/output lines (fuel pump, injectors, coils, bank angle sensor, tachometer, and check engine lamp).
• The gray socket (DT06-12SA) carries the +5 V sensor supply, sensor return ground, and all sensor input signals together with the serial communications lines.
• ECM serial communication is TTL-level RS-232 (0–5 V). Standard RS-232 interface voltage levels (±12 V) must not be applied; doing so risks permanent ECM damage.
• The 4-pin Deutsch diagnostic (data link) connector (DT04-4P) provides the serial interface: pin 1 = ECM receive (TTL), pin 2 = ground, pin 3 = ECM transmit (TTL), pin 4 = +12 V.
• The ASCII diagram above shows a 6-position view for orientation only; each physical socket has 12 pins (24 pins total across both connectors).
• DDFI-3 ECMs (2008–2010 XB and 1125R models) use two 34-pin AMP Superseal 1.0 mm sockets (black: 2-1437285-3; gray: 3-1437290-9) and have entirely different pin assignments from those shown here.

Signals

Black socket (b-prefix pins)

• b1 — +12 V switched ignition power
• b2 — ECM ground
• b3 — Fuel pump control output
• b4 — Check engine lamp output
• b5 — Front injector control output
• b6 — Front ignition coil control output
• b7 — Rear ignition coil control output
• b8 — Rear injector control output
• b9 — Exhaust valve motor feedback (XB12 models only; not connected on XB9)
• b10 — Bank angle sensor input
• b11 — Coil ground return
• b12 — Tachometer output

Gray socket (g-prefix pins)

• g1 — +5 V sensor supply
• g2 — Throttle position sensor (TPS) signal input
• g3 — Camshaft position sensor input
• g4 — Oxygen sensor input
• g5 — +12 V unswitched (direct battery)
• g6 — Cooling fan control output
• g7 — Sensor ground return
• g8 — Vehicle speed sensor input
• g9 — Engine temperature sensor input
• g10 — Intake air temperature sensor input
• g11 — Serial receive data (ECM Rx, TTL level)
• g12 — Serial transmit data (ECM Tx, TTL level)

References

• 2008 Buell XB Models Electrical Diagnostics Manual (99493-08Y)
• 2008 Buell 1125R Electrical Diagnostic Manual (99949-08Y)

Category:Car Connectors