Diagnostic socket is standard OBD-II 16-pin connector
Vehicle model: Shanghai Sunlong bus
Year model: 2010
6HK1E3S Engine type: Isuzu 6HK1E3S

Fault phenomenon
Slight shaking and loud noise of engine, acceleration badness, exhaust pipe has little black smoke, MIL not on
Diagnostic socket is standard OBD-II 16pin connector

Fault checking analysis:
Because this vehicle has electronically controlled high pressure common rail systems, it needs some advanced electronic tools to quickly and effectively deal with the engine system faults. Such as: digital multimeter, decoder, oscilloscopes and other electronic tools. Isuzu 6HK1E3S engine maintenance provides user with internationally accepted testing interface, the detection interface is generally under lower left, right corner of instrument panel or near the fuse holder. Shanghai Sunlong Automobile detection interface is installed close to fuse holder, shown in Figure 1-1. According to detection interface vehicle configured with, select electronic detection tools (such as Fcar diagnostic scanner), first connect Fcar scanner main unit with main testing cable, other end connecting with vehicle detection interface, as shown in Figure 1-2. Turn the ignition switch to ON gear or start the engine, switch on Fcar scanner main unit power switch to start the main unit, select in sequence on Fcar scanner:
Diesel cars - Sunlong bus-V5.5-6HK1E3S first read fault, see the electronic control system with or without current or historical fault codes, Fcar scanner display "system normal" consistent with MIL result on the instrument, indicating this fault may have two causes: 1, the fault is mechanical failure, 2, the failure is a comprehensive failure, need to analyze according to running data of vehicle. First, to rule out mechanical failure, check the engine oil tank exhaust volume is normal, water tank no water shortages, but according to engine operating conditions to analyze the engine does have a fault exists, mechanical parts, no problem, electronic control system no fault code, then such faults belongs to comprehensive faults. Namely electronic control system components cannot monitor work abnormal (fault code trigger condition is not met, but affect the normal operation of the engine).For components that cannot be monitored by electronic control system, running condition of each component can be known through checking data stream and function test on diagnostic scanner. After the engine starts, select read data stream on Fcar scanner menu, read data stream shown in Table 1-1.
Data stream name High speed Idle speed Static
Engine speed RPM 2000 884 0
Desired idle speed RPM 2000 884 0
Fuel rail pressure PSI 0~1 0.0 0.0
Fuel rail pressure sensorV 3 1.8 2.0
Feedback mode(Fuel rail pressure) 5 5 5
Regulator command(Fuel rail pressure)% 28 28 28
Regulator feedback(Fuel rail pressure)MA 917 917 917
Engine coolant temperature sensorV 85 50 50
Intake temperature sensorV 1.8 1.6 1.6
Intake temperature ° 45 40 32
Fuel temperature sensor V   1.7 1.7
Fuel temperature ° 45 40 40
Barometer pressure sensor V 3.3 2.3 2.3
Barometer pressure PSA 16 14 14
Required turbocharger position% 37 37 37
Boost pressure command % 0 0 0
Boost pressure sensor V 1.0 1.0 1.0
Boost pressure PSI 14 14 14
EGR position % 0 0 0
EGR line valve command % 0 0 0
EGR position 1 ON ON ON
EGR position 2 ON ON ON
EGR position 3 OFF OFF OFF
Inlet valve position % 90 24 20
Inlet valve position sensor V 4.4 3.2 3
Intake throttle valve line valve command % 0 0 0
ABS command controlled APP(Throttle pedal position)% 100 100 10
Vehicle speed MPH 0 0 0
Fuel compensation cylinder 1mm3/st -1.1 -1.1 -1.1
Fuel compensation cylinder 2mm3/st -5.1 -8.1 -8.1
Fuel compensation cylinder 3mm3/st -1.4 -3.4 -3.4
Fuel compensation cylinder 4mm3/st -0.3 -0.3 -0.3
Fuel compensation cylinder 5mm3/st -2.5 -5.5 -5.5
Fuel compensation cylinder 6mm3/st -0.0 -0.0 -0.0
Engine running state 10 3 0
Engine heating switch OFF OFF OFF
Ignition key ON switch ON ON ON
Ignition key START switch OFF OFF OFF
Brake pedal switch 1 OFF OFF OFF
Brake pedal switch 2 OFF OFF OFF
Clutch pedal switch ON ON ON
Neutral switch ON ON ON
Parking brake switch ON ON ON
Exhaust brake switch OFF OFF OFF
Exhaust brake valve command  OFF OFF OFF
Deceleration brake switch OFF OFF OFF
Deceleration brake relay command  OFF OFF OFF
Idle speed boost sensor V 3.6 3.6 3.6
Air conditioning signal ON ON ON
Exhaust brake cut off request mode ABS component No No No
Glow plug relay command  OFF OFF OFF
Glow plug light command  OFF OFF OFF
Ignition voltage V 28.4 28.4 28.4
Battery voltage V 28.4 28.4 28.4
Sensor 1(Accelerator pedal position)V 3 1.5 1.5
Sensor 2(Accelerator pedal position)V 1.5 0.74 0.74
Throttle pedal position% 70 0 0
Fuel rail pressure P 120 50 30
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