Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
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Section V. Fault Diagnosis for Electronic-Controlled Common Rail Diesel Engines
z Prior to disconnecting or reconnecting the power cord of engine control module (ECM), be sure to turn off the
ignition switch, in order not to damage the ECM.
z All types of engine DTCs are stored in the ECM memory.
z The engine DTCs should be cleared after the maintenance.
Common DTCs and Troubleshooting Methods for Electronic Control Systems of Diesel Engines
1.
DTC P0475 The exhaust brake valve control line is open.
P0476 The ECU internal driver module of exhaust brake valve control line is
overheating.
P0477 The exhaust brake valve control line is short to ground.
P0478 The exhaust brake valve control line is short to high level.
Fault Description: The engine control unit (ECU) shall actuate the exhaust braking after processing the signal
received from the exhaust brake switch and also check if the exhaust brake feedback signal matches with the ECU
control command. If not, DTC shall be reported.
Diagnosis Hint: The intermittent failure may be caused by poor contact of wire, abrasion of the insulation or damage
of the wire inside insulation.
Check for the following conditions:
z Poor contact of ECU or exhaust brake valve – Check the harness connector
– Loose terminal
– Poor matching and connection
– Breakage of keeper
– Distortion or damage of terminal
– Poor contact between terminal and wire
z Damage of harness – Check the harness for any damage
Terminal ECU
K29 Exhaust brake actuator
Exhaust brake actuato
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