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

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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

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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.