How to Measure the Crankshaft Position Sensor of a Jetta?
1 Answers
The measurement method for the Jetta crankshaft position sensor is as follows: 1. Check the normal gap between the crankshaft position sensor and the pulse wheel (target wheel), which should be greater than 0.5mm and less than 1.2mm. If the pulse wheel is installed incorrectly, being too large or too small, it may cause signal deviation; 2. Turn off the ignition switch, disconnect the crankshaft position sensor connector, and measure the resistance between terminal 1 and terminal 2 of the sensor, which should be between 400 and 600 ohms. If the reading is not within this range, it can be determined that the crankshaft position sensor itself is faulty and should be replaced. The two signal wires of the crankshaft position sensor are insulated from the shielding wire; 3. Turn on the ignition switch and measure the voltage of the two signal wires to ground, which should be 1.4V. This is the preset voltage on the signal wires by the engine control unit. When starting the engine, the signal voltage of the crankshaft position sensor should be close to 1.6V. If there is an open or short circuit inside the sensor, in the signal lines, or inside the engine control unit, it will prevent the computer from receiving the crankshaft position signal, thereby causing the engine to fail to start.
