Operation Instructions: 1. Turn off the vehicle’s engine. 2. Connect the black clip to the negative terminal of the vehicle battery and the red clip to the positive terminal. 3. Locate the fuel injector to be tested, disconnect its electrical connector, and connect the tester’s two pulse output terminals to the injector’s electrical connector. 4. Press the MODE SET button to select the desired pulse mode. The display shows the current mode. 5. After selecting the mode, press the PULSE button. The tester outputs pulse(s) to the injector, and the pulse signal indicator lights up. At any time, press the PULSE button again to stop pulse output. Injector Tester Specifications: Power Supply: 12V vehicle battery Operating Environment: 0–40°C, relative humidity < 80% Storage Environment: –10°C to 50°C, relative humidity < 85% Test Cable Length: 41.5 cm (16.3 inches) Product Dimensions: 147 × 82 × 29 mm Material: ABS Color: Black Mode s: Mode 1: Outputs 1 pulse with a width of approximately 250 ms. Mode 2: Outputs 50 pulses, each with a width of approximately 7 ms. Mode 3: Outputs 100 pulses, each with a width of approximately 3.5 ms. Mode 4: Outputs continuous pulses at a rate of 50 pulses per ~1450 ms; each pulse width is approximately 7 ms. Package Contents: 1 × Injector Tester