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: Relay Box (Engine Compartment) Components and Components Location
Component Location [Engine room junction block] [Metal Core Block (PCB)] ...

Hyundai Sonata LF 2014-2019 Service Manual: Heated Steering wheel Repair procedures
Inpection 1. Measure a resistance of NTC and Heated pad. A. NTC resistance(Black / Yellow, Black) - 10.0 k? ± 10% (25°C) B. Heated pad resistance (Yellow, Black) - 1.6 ~ 2.0 ? ± 10% 2. Measure a temperature. A. The temperature of wheel surface grip must rise from -20°C to 20° ...

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