Hyundai Genesis Coupe 2.0L Theta II MFI Wiring Diagram SD313-1 - Fuel Injection
Electrical wiring diagram of the MFI engine control system showing ECU, relays, injectors and oxygen sensor circuits.
This is page SD313-1 of the MFI (Multiport Fuel Injection) Control System wiring diagram for the Hyundai Theta II 2.0L engine (G4KF-GSL), sheet 1 of a multi-page set. It shows the power distribution from the E/R (engine room) junction box RH, including the ECU-1 10A, ECU 30A, F/PUMP 20A, SNSR-1 10A, INJECTOR 15A, and SNSR-2 15A fuses, all on a hot-at-all-times bus. Circuits pass through joint connectors (JCH82, JCH83, JCH84) to the Engine Control Relay and Fuel Pump Relay (both PHOTO 19). The fuel pump relay feeds the fuel pump motor within the fuel sender assembly via connectors EC21, EF11, and F39, grounding at GF03. The lower half details the upstream and downstream oxygen sensors (connectors CHG16/CHG17) with heater and signal wiring, and injectors #1–#4 (connectors CHG24-1 through CHG24-4). ECM connector CHG-K pin assignments are shown: pin 6 memory power, 64 engine control relay control, 38/16 sensor signal/ground, 93/94 sensor heaters, 85/84 sensor ground/signal, 25/26/28/27 injectors #1/#3/#2/#4, and 70 fuel pump relay control. Wire colors (P, G, R, Y, O, W, B, Gr, L, R/W) are labeled throughout, and cross-references point to sheets SD313-2, SD313-3, and SD450-1.
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Frequently asked questions
- What fuses power the MFI control system on the 2.0L Theta II engine?
- The diagram shows ECU-1 10A, ECU 30A, F/PUMP 20A, SNSR-1 10A, INJECTOR 15A, and SNSR-2 15A fuses in the E/R Junction Box RH, all fed from a hot-at-all-times bus.
- Which ECM pins control the fuel injectors?
- On ECM connector CHG-K: pin 25 controls Injector #1, pin 26 Injector #3, pin 28 Injector #2, and pin 27 Injector #4.
- What connector goes to the fuel pump motor?
- The fuel pump relay output runs through connectors EC21, EF11, and F39 to the fuel pump motor in the fuel sender & fuel pump motor assembly, with ground at GF03.
- What are the oxygen sensor connectors on this engine?
- The upstream (UP) oxygen sensor uses connector CHG16 and the downstream (DOWN) oxygen sensor uses connector CHG17; each has SNR (sensor) and HTR (heater) circuits.
- Which ECM pin controls the fuel pump relay?
- ECM pin 70 (wire color G) is labeled Fuel Pump Relay Control.
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