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 scanner is required for diagnosis and inspection, some inspection methods and steps for using Fcar car 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 【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 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 °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 of bulb）		Engine speed rpm		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.

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