Engine JAC HFC4DA1-2C. Manual — part 36

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

143

Fault Tree:

Turn off the ignition switch and check the fuel

injector connector.

Connector fault

Repair accordingly.

Disconnect the fuel injector and turn on the ignition

switch.

Does the problem still exist?

Refer to “Inspection of Fuel Injector

Wiring” listed below.

Clear the DTC, turn off the ignition switch, reconnect

the fuel injector and turn on the ignition switch.

Does the problem reoccur?

Replace relevant fuel injector and

update the ECU data.

Repeat the above procedures for other fuel injectors.

Check the wiring of fuel injector.

Check the ECU connector.

Connector fault

Repair accordingly.

Check continuity and insulating property.

Electrical fault

Repair the harness.

Get the Technical Support.

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

144

8.

DTC P0203

The

3

rd

cylinder fuel injector circuit is open.

P0267

The low end of the 3

rd

fuel injector is short to the high end.

P0268

The low end of the 3

rd

fuel injector is short to the high level.

P0269

Other errors of the 3

rd

cylinder fuel injector

P1204

The forward error correction of the 3

rd

fuel injector is too large.

P1205

The reverse error correction of the 3

rd

fuel injector is too large.

P1210

The dynamic forward error correction of the 3

rd

fuel injector is too large.

P1211

The dynamic reverse error correction of the 3

rd

fuel injector is too large.

P1239

Other errors of the 3

rd

cylinder fuel injector

P123A

Other errors of the 3

rd

cylinder fuel injector

P123B

Other errors of the 3

rd

cylinder fuel injector

Fault Description: The ECU controls the switching-on circuit of fuel injector directly. The ECU controls the time for
switching on each fuel injector via adopting a device named “Driver” to supply PWM current to each fuel injector
control circuit. The driver owns a feedback circuit, which is monitored by ECU to verify if the control circuit is open
or short. If any failure in the fuel injector control circuit is detected by ECU, the fuel injector control circuit DTC shall
be generated.

Diagnosis Hint: For the failure in wire connector shall trigger the setting of DTC, be sure to check the connectors
relevant to this diagnostic procedure for short circuit of terminal or poor contact of wire, prior to replacement of any
component. Observe the state parameter of relevant fuel injector on the diagnostic tool while shaking the wire and
connector relevant to the test. If any intermittent failure is existed in the tested wire or connector, the relevant failure
shall be displayed on the diagnostic tool.

Performing compression test is helpful for locating the intermittent failure.

Terminal ECU

A01 1

st

fuel injector “High”

A46 1

st

fuel injector “Low”

1

st

fuel injector “High”

1

st

fuel injector “Low”

3

rd

cylinder

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

145

Fault Tree:

Turn off the ignition switch and check the fuel

injector connector.

Connector fault

Repair accordingly.

Disconnect the fuel injector and turn on the ignition

switch.

Does the problem still exist?

Refer to “Inspection of Fuel Injector

Wiring” listed below.

Clear the DTC, turn off the ignition switch,

reconnect the fuel injector and turn on the ignition

switch.

Does the problem reoccur?

Replace relevant fuel injector and

update the ECU data.

Repeat the above procedures for other fuel injectors.

Check the wiring of fuel injector.

Check the ECU connector.

Connector fault

Repair accordingly.

Check continuity and insulating property.

Electrical fault

Repair the harness.

Get the Technical Support.

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

146

9.

DTC P0204

The

4

th

cylinder fuel injector circuit is open.

P0270

The low end of the 4

th

fuel injector is short to the high end.

P0271

The low end of the 4

th

fuel injector is short to the high level.

P0272

Other errors of the 4

th

cylinder fuel injector

P1206

The forward error correction of the 4

th

fuel injector is too large.

P1207

The reverse error correction of the 4

th

fuel injector is too large.

P1212

The dynamic forward error correction of the 4

th

fuel injector is too large.

P1213

The dynamic reverse error correction of the 4

th

fuel injector is too large.

P123C

Other errors of the 4

th

cylinder fuel injector

P123D

Other errors of the 4

th

cylinder fuel injector

P123E

Other errors of the 4

th

cylinder fuel injector

Fault Description: The ECU controls the switching-on circuit of fuel injector directly. The ECU controls the time for
switching on each fuel injector via adopting a device named “Driver” to supply PWM current to each fuel injector
control circuit. The driver owns a feedback circuit, which is monitored by ECU to verify if the control circuit is open
or short. If any failure in the fuel injector control circuit is detected by ECU, the fuel injector control circuit DTC shall
be generated.

Diagnosis Hint: For the failure in wire connector shall trigger the setting of DTC, be sure to check the connectors
relevant to this diagnostic procedure for short circuit of terminal or poor contact of wire, prior to replacement of any
component. Observe the state parameter of relevant fuel injector on the diagnostic tool while shaking the wire and
connector relevant to the test. If any intermittent failure is existed in the tested wire or connector, the relevant failure
shall be displayed on the diagnostic tool.

Performing compression test is helpful for locating the intermittent failure.

Terminal ECU

A17 2

nd

fuel injector “High”

A33 2

nd

fuel injector “Low”

2

nd

fuel injector “High”

2

nd

fuel injector “Low”

4

th

cylinder