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
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