FUSO Diagnosis Engine diagnosis principles and check

FUSO Diagnosis Engine diagnosis principles and check
Model:FUSO
Year:Jun,2007
Chassis Model:FV51JK
Engine Model:6M70
VIN:JL6ERK6BX7K034727
Engine diagnosis principles and check:
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 scanneris
required for diagnosis and inspection, some inspection methods and steps
for using Fcar car scannerto diagnose FUSO(Pic.1) will be introduced as
below:
1. Connection of scanner
A, First connect, testing cable to OBDtest 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 【Diesel】——【FUSO】—【V5.1】——【Engine system】
——【Version infomation】——【Software No. E918】——【Read DTC】——
【System normal】——【Clear DTC】——【DTC clear success】——【Read data
stream(like Table 1)】——【Actuation 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 ℅ 65.6 10.0 0
08 Actual fuel rail pressure℅ 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
9.2
mg/st
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 °C 83.6 75.9 32.6
13 Fuel temperature °C 50.8 56.5 35.3
14 Air temperature°C 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 ℅ 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⊙Red means light on、⊙green means light off,
Engine speed red 530、568、means Engine speed increase,Engine speed
green 464,means decrease/Idle,
Red√ means works、Green × means pause,

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