FUSO Diagnosis Engine diagnosis principles and check

Model£ºFUSO
Year£ºJun£¬2007
Chassis Model£ºFV51JK
Engine Model£º6M70
VIN£ºJL6ERK6BX7K034727
Engine diagnosis principles and check£º

¡¡¡¡¡¡With the development of technology and atmospheric environmental protection, diesel vehicles are gradually applying electronic controlled engine Euro III, Euro IV etc.. During repair, auto diagnostic scanner is required for diagnosis and inspection, some inspection methods and steps for using Fcar scanner to diagnose FUSO(Pic.1) will be introduced as below:
1£® Connection of scanner
A, First connect, testing cable to OBD test head and main unit.
B, Find diagnostic socket location of this vehicle(See Pic.2)
C, Connect diagnostic socket and turn ignition switch to ON
D, Turn on Power switch of Fcar scanner
2£® Diagnosis and inspection steps of engine
A Enter menu and select ¡¾Diesel¡¿¡ª¡ª¡¾FUSO¡¿¡ª¡¾V5.1¡¿¡ª¡ª¡¾Engine system¡¿¡ª¡ª¡¾Version infomation¡¿¡ª¡ª¡¾Software No. E918¡¿¡ª¡ª¡¾Read DTC¡¿¡ª¡ª¡¾System normal¡¿¡ª¡ª¡¾Clear DTC¡¿¡ª¡ª¡¾DTC clear success¡¿¡ª¡ª¡¾Read data stream£¨like Table 1£©¡¿¡ª¡ª¡¾Actuation test£¨like table 2£©¡¿
B Engine data stream£¨Table 1 FUSO¡¢6M70£©
Name of data stream High speed Idle speed Static
01 Engine speed rpm 1965 464 0
05 Fuel Quantity ¨G 65.6 10.0 0
08 Actual fuel rail pressure¨G 68.9 25.0 0
09 Injection timing CA 1.1 0.0 0
0A Pilot injection time CA 11.6 3.0 0
0B Pilot injection amount mg/st 9.2 5.0 1.0
0D Acceleration V 0.0 0.0 0.0
0E Acceleration V 3.650 0.840 0.00
10 Vehicle speed km/h 0.0 0.0 0.0
11 Idle speed V 9.387 2.940 0.000
12 Water temperature ¡ãC 83.6 75.9 32.6
13 Fuel temperature ¡ãC 50.8 56.5 35.3
14 Air temperature¡ãC 40.3 34.4 31
15 Q resistor 7 7 7
16 Air pressure kpa 110 100 100
17 Boost pressure kpa 320 100 000
18 Battery voltage V 28.60 28.20 24.6
23 PTO Acceleration ¨G 0.0 0.0 0.0
24 PTO Acceleration V 3.650 0.840 0.00
25 PTO resistor 1 1 1
35 ASC setting speed km/h 0.0 0.0 0.0
D actuation test£¨Table 2 FUSO¡¢6M70£©

Light bulb¡ÑRed means light on¡¢¡Ñgreen means light off£¬
Engine speed red 530¡¢568¡¢means Engine speed increase£¬Engine speed green 464£¬means decrease/Idle£¬
Red¡Ì means works¡¢Green ¡Á means pause£¬

Name of sensor light£¨¡Ñ symbol of bulb£© Engine speed rpm Start¡Ì Pause¡Á
A6 Power retarder M/V-R ¡Ñ 464
A7 Exhaust brake M/V ¡Ñ 530 464 ¡Ì ¡Á
A8 Auxiliary brake S/L ¡Ñ 464
A9 ASC light ¡Ñ ¡Ñ 464 ¡Ì ¡Á
AA Auxiliary brake P/L ¡Ñ 464
AB DIAG light£¨R£© ¡Ñ ¡Ñ 464 ¡Ì ¡Á
AC DIAG light£¨U£© ¡Ñ ¡Ñ 464 ¡Ì ¡Á
AD A/C signal ¡Ñ 568 464 ¡Ì ¡Á
AE Idle boost cancel ¡Ñ 464
B2 Fuel leak check ¡Ñ 464
B3 VGT test ¡Ñ 464


Note: Actuation test must be performed under condition that control setting matching, sensor and line are confirmed normal, otherwise, it will leads to operation failure. If operation still failed in case of system normal, then means this vehicle not installed with actuation test system and no such function

3, Maintenance experience

¡¡¡¡¡¡To perform vehicle engine system diagnosis and inspection, you must be familiar with usage of auto diagnostic tool and diagnostic methods and steps, such as check engine data stream, compare engine speed, high speed, idle speed, static state, working condition, so as to judge sensor is good or not.
¡¡¡¡¡¡Actuation test is used for check control unit and parts whether work normal and also a method for Fcar scanner to judge the cause for fault.

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