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What is the crankshaft position sensor

Update:05 Feb 2021
Summary:

The function of the crankshaft position sensor is to de […]

The function of the crankshaft position sensor is to determine the position of the crankshaft, that is, the rotation angle of the crankshaft. It usually works with the camshaft position sensor to determine the basic ignition timing. We all know that the engine starts to ignite at the end of the compression stroke, so how does the engine computer know which cylinder should be ignited? It is calculated by the signals of the crankshaft position sensor and the camshaft position sensor. Through the crankshaft position sensor, you can know Which cylinder piston is at the top dead center, through the camshaft position sensor, you can know which cylinder piston is in the compression stroke. In this way, the engine computer knows when to fire which cylinder.

Disassembly
The crankshaft position sensor is installed on the gearbox clutch housing, located behind the left side of the engine block. The crankshaft position sensor is fastened with two bolts. The crankshaft position sensor is cushioned on the bottom surface of the crankshaft position sensor with adhesive paper pads or cardboard pads for adjustment. The depth of the sensor, once the engine is started (after the crankshaft position sensor is installed), the excess part of the paper pad should be cut off. The new spare sensor will carry this gasket. If the original crankshaft position sensor is reinstalled, or the gearbox and clutch housing are replaced, a new gasket must be installed.

When disassembling, near the rear of the intake manifold, remove the sensor harness from the main harness, remove the nut that fixes the crankshaft position sensor wire clip on the oil pipe mounting bolt, remove the crankshaft position sensor mounting bolt, and remove the crankshaft position For the sensor, remove the clamp of the crankshaft position sensor wire harness. When installing, install the protruding head of the crankshaft position sensor into the hole of the gearbox housing to make the end face flush. Install and tighten the two mounting bolts of the crankshaft position sensor with a torque of 17-21N·m. The two bolts that fix the crankshaft position sensor to the gearbox are specially made to ensure that there is a correct gap between the sensor and the flywheel. It is not allowed to install other bolts instead of special bolts. Connect the wire plug to the crankshaft position sensor, install the sensor harness clip, install the clip on the fuel pipe mounting bolt, and screw on the mounting nut of the clip.