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 Owners Manual: Battery
WARNING To prevent SERIOUS INJURY or DEATH to you or bystanders, always follow these precautions when working near or handling the battery: Always read and follow instructions carefully when handling a battery. Wear eye protection designed to protect the eyes from acid splashes. Keep all flame ...

Hyundai Sonata LF 2014-2019 Service Manual: Front Stabilizer Bar Repair procedures
Inspection 1. Raise the vehicle, and make sure it is securely supported. 2. Remove the wheel cap (A).     Be careful not to damage to the wheel cap (A) when removing the it. 3. Remove the front wheel and tire (A) from front hub. Tightening torque : 88.3 ~ 107.9N. ...

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