Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
153
12.
DTC P0340 No signal from phase sensor
P0341 False signal from phase sensor
Fault Description: The camshaft position (CMP) sensor is a Hall Effect switch. The ECU shall supply 5V voltage to
the 5V reference voltage circuit and also supply grounding for the low reference voltage circuit. The CMP sensor shall
provide a signal voltage to ECU by coordinating with 1X variable reluctance rotor. The ECU shall make use of this
signal voltage to determine the camshaft position. The CMP sensor links the crankshaft with the camshaft position to
facilitate ECU to determine which cylinder the fuel should be injected to. During the rotation of camshaft, the variable
reluctance rotor changes the magnetic field generated by the magnet in sensor and send a signal to ECU via the signal
circuit. The CMP sensor circuit is directly connected to ECU. The CMP sensor can also be adopted to tell which
cylinder has misfire. The circuits between CMP sensor and ECU include:
High reference voltage circuit of CMP sensor
Ground circuit
Camshaft position signal circuit
When no occurrence of minimum camshaft position synchronization is detected by ECU or there is failure in CMP
sensor signal circuit, DTCs shall be generated.
Diagnosis Hint: Prior to maintenance, all fragments should be removed from the connector surfaces. Prior to
diagnosis or replacement, please check the connector gaskets to ensure they are properly installed to avoid ingress of
any pollutant.
Poor terminal connection – Check the harness connector for any loose terminal, mismatching, damaged keeper,
improper form or damage, poor contact between terminal and wire. Check if the matched terminal is adopted. Check
if the test tension is appropriate.
Harness damage – Check the harness for any damage. If the harness appears normal, observe the indication on the
diagnostic tool while moving relevant connector and harness of the sensor. If the indication changes, there must be
failure in that part.
Check if the ground and connection of ECU and engine is reliable and clean. If the DTC is determined to be
intermittent failure, please refer to the fault records to find out when the previous DTC is set.
Terminal ECU
A08 Signal terminal of phase sensor
A57 Negative signal terminal of phase sensor
A35 Shielded terminal of phase sensor
Camshaft position
sensor
5V power supply
CMP signal
Ground
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