Page 255 - Foton Workshop Manual - Aumark (BJ1099)

ENGINE CONTROL SYSTEM - PHASE SENSOR 11-29
PHASE SENSOR

1. Principle of work
The phase sensor is also the camshaft position sensor. This sensor is composed of
a hall sensor and a rotor made of steel plate. The hall sensor is fixed. The rotor is
installed on camshaft. The rotor is a cylindrical steel blade with the range of 180° .
There is no output signal when the blade covers hall sensor, otherwise, there is an
output signal. Since that two semi-cycles of camshaft are equal to two hole cycles
of crankshaft, the compression top dead center and exhaust top dead center of 11
crankshaft can be identified.
2. Function and installation
Phase sensor is applied to match with speed sensor to provide crankshaft phase
information for ECU, namely, to identify the compression top dead center and
exhaust top dead center of the first cylinder.
Phase sensor is installed at the camshaft cover.
3. Fault phenomenon and judgment method
(a). Fault phenomenon: Emission exceeds standard, and fuel consumption increases,
etc..
(b). General causes for faults:
Man-made fault.
(c). Precautions for maintenance:
• Use press-in method rather than hammering method in maintenance process.
• Clean the surface of installation site after removal, and ensure that there is no oil
contamination.

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