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Hitachi DFC306 is an electrically controlled feedback carburetor, used on A12 engine for Sunny Truck beginning October 1989.

For the 1981 carburetor, see DCF306

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1 Overview
- 1.1 Connector 1
- 1.2 Connector 2
2 ECU
3 ECU Control
4 Specifications
5 Manifold
6 Applications
7 DFC306-46
8 Vanette

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Overview

Feedback carburetor DFC306 is the carburetor on 1989-1994 JDM A12 engines. It requires a special water heated Intake Manifold and #ECU control for the electronic feedback (closed-loop mixture control).

At first glance, it looks like other A-series carburetors with automatic choke (DCH306-series), but it has large electrical connectors

The most obvious feature may be this extended flange, with electric valve on one end, and water-contact area on other end
Album 10188

ID - behind sight-glass

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Connector 1

Lower Valve

Mixture Control Solenoid (MCS) Valve

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Connector 2

IACV-FICD SOLENOID VALVE
Idle Air Control Valve - FICD

Electric Choke

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ECU

Factory Nissan 1200 ECU controls the electronic feedback carb via input from O2 sensor. For 1990-1994 Nissan Sunny Truck (R-B122).

22604-95W00 Control Unit Assembly, engine
            ｺﾝﾄﾛ-ﾙ ﾕﾆﾂﾄ ｱﾂｾﾝﾌﾞﾘ-,ｴﾝｼﾞﾝ

Post 498227

18-pin connector (with 2 missing pins)
Post 498227

Post 498227

52
22604-95W00
FBM-N13
<4-digit serial number>
Hitachi, Ltd. Tokyo Japan

Post 498227

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ECU Control

ECU takes input signals from engine including water temp and O2 sensor and adjust the air/fuel mixture via the carburetor solenoid.

Carburetor electrical connector includes the automatic choke wire and Feedback Solenoid wires

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Specifications

Model: DFC306-26
Air horn entrance (inside diameter - outside diameter) 54-59 mm
Primary nozzle system (primary) secondary side (secondary)
Zenith Stromberg protruding type
Throttle Bore (mm) 26/30
Venturi (mm) 23/27
Venturi in diameter (inner - outer diameter) (mm) - 13-16
Venturi small diameter (inner - outer diameter) (mm) 8-16 7-10
Nozzle diameter (inner diameter - outside diameter) (mm) 2.1-3.0 2.8-4.0
92 main jet size 120 (# engraved)
Diameter 43 80 slow jet (# engraved)
Economizer diameter bleed 95 140 (# engraved)
90 main jet diameter correction (# engraved) -
Slow diameter air bleed correction for 230 (# engraved) -
Main air bleed size 70 60 (# engraved)
155 slow air bleed size 80 (# engraved)
All 閉角 degree throttle valve 9 20 (degrees)
Float chamber fuel pressure (kg/cm2) 0.24
Float level standard (from the top of the float chamber) (mm) 21
Idle port (mm) 1.6
Opening fast idle (dimension G) 1.35 (0.84) (degrees)
Auto choke choke system
Two-stage diaphragm complete explosion
爆開 complete degree automatic choke at low temperatures 
* (dimension R) 25 (1.66) (degrees)
At high temperatures 33 (2.48) (degrees)
Choke set temperature (℃) 16

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Manifold

Water-heated carburetor requires a special manifold.

1989-up Datsun 1200 manifold with extended-length carb flange
Album 7887

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Applications

DFP306-5

DFC306-3  16010-11M07 Nissan B11 Sunny E15S.MT-(GL,LT).F5 8410-8412
DFC306-3A 16010-11M08 Nissan B11 Sunny E15S.MT-(GL,LT).F5 8412-
DFC306-4  16010-12M07 Nissan N12 Pulsar E15S.AT 8403-8412, B11 E15S.AT 8410-8412
DFC306-4A 16010-12M08 Nissan N12 Pulsar E15S.AT 8412-8604, B11 E15S.AT 8412-
DFC306-4B 16010-12M09 Nissan N12 Pulsar E15S.AT 8604-
DFC306-5  16010-52A00 B12 Sunny E15S.2WD.MT 8509-8601
DFC306-5A 16010-52A01 B12 Sunny E15S.4WD.MT 8509-8601, E15S.MT 8601-8604
DFC306-5B 16010-52A02 B12 Sunny E15S.MT 8604-8709
DFC306-6  16010-52A10 B12 Sunny E15S.2WD.AT 8509-8601
DFC306-6A 16010-52A11 B12 Sunny E15S.4WD.AT 8509-8601, E15S.AT 8601-8604
DFC306-6B 16010-52A12 B12 Sunny E15S.AT 8604-8709
DFZ306-31 16010-47A05 VB11 AD Van E15S.MT 8805-
DFC306-46 16010-19B00 K10 {{wiki|Nissan Micra)) with Nissan_MA_engine#MA12Sᵂ (MT.F5)
DFC306-46 16010-19B10 Nissan K10 Micra (K10) MA12S (AT.F3) 
DFC306-54 K10 Nissan Be-1ᵂ with MA10Sᵂ engine AT

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