Vehicle model: Huanghai Bus
Year: Oct., 2004
Engine type:ISC0268
VIN: LDD24E03840004329
Diagnostic principle and steps of imported Cummins ISC.In order toprevent short circuit and open circuit of engine communication line,this vehicle manufacturer designed 2 kind of diagnostic sockets:round 8-pin and Goods fonts 3-pin connector,which brings inconvenience to maintenance technician.The diangostic  procedure as below                           

Diagnose with 9-pin diagnostic connector:
Find 9-pin diagnostic connector position of this vehicle;connect diagnostic socket,place ignition switch in ON position after confirm normal connection;Turn on power switch of Fcar automotive scan tools.Check whether instrument fault light abnormal or not;Enter menu to select【Diesel】—【Cummins—【V5.8】—【Cummins diesel engine】—【Cummins ISC engine_24V】there are following functions:【Read DTC】—【Clear DTC—【Read data stream】

Use 3-pin diagnostic connector to diagnose:
Find 3-pin diagnostic position of this vehicle,which located in nearby of computer board output line oil filter besided engine.To measure pin voltage with multimeter to confirm communication line;(Pin voltage see Table 1)use diagnostic line to connect with jumper box and OBD code reader main unit;
Connect with 3-pin diagnostic socketcand jumper box pin(connection method of universal jumper box and diagnostic pin as shown in Table 2)
Due to 3-pin connector without peripheral device power supply, cigar lighter line or battery terminal line are required to supply power to peripheral device (namely automotive code scanners);
Note: Must use power supply on the same vehicle, ensuring above 12V, otherwise impact between voltages will result in failure to diagnose system.
Entry to menu to select【Diesel】—【Cummins】—【V5.8】—【Cummins diesel engine】—【Cummins ISC engine-24V】,there are following functions:【Read DTC】—【Clear DTC】—【Read data stream】
 
 
 
 
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