Engine JAC HFC4DA1-2C. Manual - part 38

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines 

 

151

z  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 

 

 

A13 

Signal terminal of CKP sensor 

 

A14 

Negative signal terminal of CKP sensor 

 

A56 

Shielded terminal of CKP sensor 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines 

 

152

Fault Tree: 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check the sensor connection.

Connector fault 

Repair accordingly. 

Check the ECU connector.

Connector fault 

Repair accordingly. 

Repair the harness. 

Electrical fault 

Check continuity and insulating property.

The new sensor is connected.

Does the problem still exist?

Replace the target wheel. 

The new target wheel is installed.

Does the problem still exist?

Get the Technical Support. 

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

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines 

 

154

Fault Tree: 

 

Check the sensor connection. 

Connector fault 

Repair accordingly. 

Visually check the sensor. 

Sensor fault 

Replace the sensor. 

Check the ECU connector. 

Connector fault 

Repair accordingly. 

Repair accordingly. 

Repair the harness. 

Signal fault 

Check the signals of camshaft and crankshaft 

sensor with oscilloscope if possible. 

Check continuity and insulating property. 

Electrical fault 

Check the target wheel of camshaft.

Fault of target wheel 

Replace the target wheel. 

Check the positioning of camshaft target wheel.

False positioning of camshaft target wheel 

Correct the positioning of target wheel. 

Get the Technical Support.