Hyundai Tucson: 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 (x)1.5 [20°C(68°F)] ...

Injector Schematic Diagrams
Circuit Diagram (M/T) (A/T) ...

Other information:

Hyundai Tucson (LM) 2010-2015 Service Manual: Instrument Cluster Components and Components Location
Components (1) Components (2) ...

Hyundai Tucson (LM) 2010-2015 Service Manual: Relay Box (Passenger Compartment) Description and Operation
Description SJB (Smart Junction Box) 1. Specification ItemRequirementRemarkRated voltageDC 12VxVoltage rangeDC 8 ~ 16VNormal operating in this rangeStorage temperature-40°C ~ +95°CxOperating temperature-30°C ~ +85°CxOperating humidity85%PCB, Damp proofing, Coating, etc.Dark currentMax. 2 ...

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