Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
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instrument circuit and determine whether there is short-circuit or open-circuit between circuit and the grounding wire,
whether there is short-circuit or open-circuit to power supply, and whether the circuit is consistent with the given pin
definition.
7. Diagnosis interface
1) Overview
The diagnosis interface is located in the electric box beneath the driver’s side instrument panel and is used to connect
the special diagnosis instrument.
2) Working Principle
This is one data transmission interface for communication with ECU and is one standard OBD interface.
3) Measurement analysis
4) Malfunction Mode
Short-circuit or open-circuit between engine control unit and diagnosis interface.
Working failure of engine control unit.
5) Troubleshooting:
Use Sunray special diagnosis instrument to check the trouble code and determine the malfunction position. Mainly
check the circuit from engine control unit to diagnosis interface circuit and determine whether there is short-circuit or
open-circuit between circuit and the grounding wire, whether there is short-circuit or open-circuit to power supply,
and whether the circuit is consistent with the given pin definition.
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