Fuel injectors, based on signals from the ECM, inject fuel into the engine cylinders. The amount of fuel supplied depends on the opening time of the injectors, i.e. on the width of the voltage pulse applied to the injector winding.
Checking with a stethoscope
1. When the engine is idling, use a stethoscope to check the operation of the injectors for clicks. With an increase in the frequency of rotation of the crankshaft, clicks should be heard more often.
Attention! Ensure that clicks from the adjacent injector are not transmitted through the line to the inoperative injector.
2. In the absence of a stethoscope with your finger, check the operation of the nozzles by the presence of clicks. If there are no clicks, check the reliability of connecting the connectors to the injectors and the output voltage of the control unit.
Measuring resistance between connector pins
1. Disconnect the connector from the fuel injector and measure the resistance between the connector pins. Resistance: 15.9±0.35 ohm at 20°C.
2. Connect the connector to the fuel injector.