General Precautions of EFI System Maintenance
F-50
63. P0328 High signal circuit voltage of shock sensor
Description about Malfunction Cause:
The knock sensor is installed on the engine body. The engine vibrates in different frequency of vibration
under different operating conditions, and generates voltage signals containing various frequencies. The
voltage signal may not only reflect whether or not the engine has experienced knock but also reflect the
background noise value of the engine (the noise of mechanical parts). When the engine is operating normally
and the knock sensor is working normally, the background noise value will fluctuate within the specified
range. Once the background noise value is lower than the set threshold, the system then believes that
malfunction exists with the mechanical parts of the engine.
Malfunction Diagnostic Guide:
Required Equipment: (Diagnostic Instrument with EOBD Diagnostic Function)
Step I: Use diagnostic instrument to read the malfunction information
Read Result I Read Result II
MIL Lamp On P-CODE Present MIL Lamp Off P-CODE Present
P0328
P0328
Maintenance tips:
The malfunction has been confirmed, and the following
problems may possibly exist
1) Serious wear on some parts of engine, and
mechanical parts of engine (piston ring, piston pin,
bearing bush, and clearance between parts, etc) to
be inspected
Maintenance tips:
The malfunction has not been finally confirmed,
and wait for the system to fulfill self-diagnosis.
64. P0340 Phase Sensor Installation Position Improper
Description about Malfunction Cause:
The operation principle for phase sensor is to use a Hall component to induce a signal wheel to rotate along
with the camshaft, thus to monitor the position of camshaft. The phase signal received by ECU shall be
changing alternately on a regular basis between the high level and the low level, and ECU shall determine that
malfunction exists with the phase signal, when only slow change in high and low levels is detected.
Schematic Diagram:
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