Electronic throttle

Bosch DBW, 6-pin ETB · output · Actuator

H-bridge motor plus two TPS tracks in one body. The two Race Core H-bridges are either this, or a stepper idle — not both. Pedal is a separate sensor.

Typical parts: Bosch motorsport 40 / 54 / 60 / 68 mm ETB; GM 90 mm LS ETB (different 6-pin — confirm)

Warning — XOR with stepper. ETB 1± and ETB 2± are one job. Electronic throttle or bipolar stepper idle. Not both on one Race Core.

Device pinout

Looking into the rear of the plug (wire side), polarising key at the top. Two rows: 1 2 3 over 6 5 4. Bosch motorsport 32–40–54–60 mm family.

• Connector: Bosch 6-way on the throttle body
• Layout (looking into the part): 1 · 2 · 3 / 6 · 5 · 4; polarising key top

Wiring notes

• Bosch 46 mm and 52 mm bodies swap motor and pot pins — read the Bosch pin-layout sheet for that bore. Do not assume this page.
• TPS 2 5 V should come from 5 V Sens 2 (C10) if the body brings a second 5 V cavity; on this 6-pin family both pots share pin 3. Still split APP across Sens 1 / Sens 2.
• If the blade drives the wrong way, swap the two motor wires (B7 / B6).
• Calibrate APP, then TPS, then command a few percent duty. 100 % duty against a closed stop kills the H-bridge.
• Stepper idle cannot share this ECU. Cable throttle + stepper is the other article.

Failure modes

• Blade drives shut when you ask for open: swap the two motor wires (B7 and B6).
• Throttle fault at small openings: TPS 1 and TPS 2 are not both calibrated, or they share a 5 V rail with a shorted pedal track.
• H-bridge thermal fault: the blade was driven into the stop at high duty. Calibrate before you command more than a few percent.
• Stepper idle and this throttle on one ECU: they want the same two H-bridges. Pick one.

See also

• APP pedal
• Stepper idle