Hyundai Sonata: Engine Control System / Injector Troubleshooting

Signal Waveform
The three waveforms below are taken from the #1 and #4 injectors. The top waveform is from the high side (feed side) of the #1 and #4 injectors, while the middle waveform is from the low side (ground side) of the #1 injector and the bottom waveform is from the low side of the #4 injector.
The middle waveform is the same as the top waveform because there is no ground for the circuit. With no current flowing in the circuit, the #1 injector is not energized and fuel does not flow.
The bottom waveform shows that ground is supplied and there is a voltage drop across the #4 injector. With current flowing in the circuit, the #4 injector is energized and fuel flows.

Injector Specifications
Specification ItemSpecificationCoil Resistance (?)1.5 ± 0.075 [20°C(68°F)] ...

Injector Schematic Diagrams
Circuit Diagram ...

Other information:

Hyundai Sonata LF 2014-2019 Service Manual: Lift And Support Points
General Information     When heavy rear components such as suspension, fuel tank, spare tire, tailgate and trunk lid are to be removed, place additional weight in the luggage area before hoisting. When substatial weight is removed from the rear of the vehicle, the center o ...

Hyundai Sonata LF 2014-2019 Service Manual: Components and Components Location
Component 1. Steering column2. Multifunction switch3. Screw4. Clock spring ...

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