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Pub. No. TWSE0005-1, NOVEMBER 2004 
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Pub. No. TWSE0005-1, NOVEMBER 2004 
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GROUP INDEX 
ELECTRICAL ....................................... 
FOREWORD 
This Shop Manual is published for the information and 
guidance of personnel responsible for maintenance of 
Mitsubishi Fuso truck, and includes procedures for adjust- 
ment and maintenance services. 
We earnestly look forward to seeing that this manual is 
made full use of in order to perform correct services with 
no wastage. 
As this Shop Manual is published as a supplement to the 
following Shop Manuals, please refer to the following for 
information not included in this manual. 
Chassis CANTER '01.... ... ............ Pub. No. TWSE0005 
Inaddition to this manual, you can also refer to the follow- 
ing manuals when performing services: 
Diesel Engine 4D3 . .......... ... ......... Pub. No. TWDE0004 
Diesel Engine 4M4 ........... .......... .. Pub. No. TWDE0003 
For more details, please consult your nearest authorized 
Mitsubishi dealer or distributors. 
Kindly note that the specifications and maintenance ser- 
vice figures are subject to change without prior notice in 
line with improvement which will be effected from time to 
time in the future. 
Applicable models 
FE 
©2004 Mitsubishi Fuso Truck & Bus Corporation 
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GROUP 54 ELECTRICAL 
For other details except for items described below, please refer to shop manual chassis 
CANTER'01 (Pub.No.TWSE0005) Group 54 electrical. 
0G 
E 
N 
E 
R 
A 
L 
DIAGNOSIS CODES .............................................................................. 54-0-2 
STRUCTURE AND OPERATION ........................................................... 54-0-4 
4 METER CIRCUIT 
SPEEDOMETER CIRCUIT............................................................ 54-4-2 
10 PARTS INSTALLATION POSITIONS 
PARTS INSTALLATION POSITIONS ....................................................54-10-2 
13 ON-VEHICLE INSPECTION AND ADJUSTMENT 
INSPECTION OF SLD ECU.........................................................54-13-2 
412 
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54-0-1 
0 GENERAL 
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54-0-2 
1. Cautions to Observe when Performing Inspections 
CAUTION 
The battery voltage must be the standard voltage. 
Make sure no harness connector or component connector is loose. Before disconnecting any connector, 
place the starter switch in the LOCK position and wait 20 seconds. 
After making a repair, delete the diagnosis code using the Multi-Use Tester or memory clear switch. 
As a general rule, inspection work should be performed with the starter switch in the LOCK position. 
However, it may be necessary to perform certain tasks with the starter switch in the ON position. At these 
times, be careful not to cause short circuits between connector terminals and between terminals and the 
vehicle body. 
Indicated component resistances may not fall within the standard ranges if they are unduly affected by 
the temperature and/or by the accuracy of the tester. Standard values in the text are given on the assump- 
tion of room temperature (10 to 35°C). 
After rectification of an abnormality, the system's ability or inability to automatically return to normal con- 
trol from the control during fault that begins when a fault occurs depends upon the diagnosis code, i.e., 
the fault location. When the system resumes normal control, the warning lamp goes off. 
Even when an abnormality has been rectified and the system has automatically returned to normal con- 
trol, the diagnosis code corresponding to the fault location remains in the memory of the electronic con- 
trol unit as a past diagnosis code. 
Following a fault that does not permit an automatic return to normal control from the control during fault 
that begins when a fault occurs, it is necessary to clear the diagnosis code from memory in order for the 
system to recover. 
DIAGNOSIS CODES 
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54 
54-0-3 
2. Readout of Diagnosis Codes 
2.1 Diagnosis codes 
Only the current diagnosis codes are displayed. 
(1) Current diagnosis code 
It is the diagnosis code that electronic control unit memorizes because of a failure that occurred after turning ON 
the starter switch (during the power of electronic control unit is ON), and it is the state before the code will change 
to a past diagnosis code. 
2.2 Readout of diagnosis code 
The readout of diagnosis code is made by reading the blinking of SLD warning lamp. The diagnosis code contin- 
ues to be displayed until a section of failure returns to normal. 
SLD: Speed limitation devices 
When the starter switch is turned ON from OFF position, SLD 
warning lamp will start displaying the diagnosis code of fault by 
blinking, that is, turning ON for 0.5 sec and OFF for 1 sec alter- 
nately. 
The readout of diagnosis code is made by reading the frequency 
and the time of blinking of the warning lamp. 
The blinking time differs between the tens place and the ones 
place of the diagnosis code. 
The tens place: every 0.5 sec 
The ones place: every 0.2 sec 
The diagnosis code will be displayed in sequence. First, the tens 
place and then the ones place. 
One diagnosis code is displayed once. When two or more diag- 
nosis codes are displayed, there will be an interval of blinking for 
1.3 sec between the diagnosis codes. 
Diagnosis codes will be repeatedly displayed in the ascending 
order of the code number. 
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54-0-4 
3. Speed Limitation Devices (SLD) 
3.1 Outline 
Speed Limitation Devices (SLD) is controlled by SLD ECU and its function is to control the vehicle speed not to ex- 
ceed 90 km/h regardless of operation of the accelerator. 
SLD ECU has functions such as the diagnosis function that makes self-diagnosis of its main components and warns 
the driver if there is a failure. 
3.2 Electronically controlled system 
(1) System block diagram 
3.3 Failure diagnosis function 
SLD ECU diagnoses at all times whether the accelerator pedal position sensor, the inside of ECU, etc. Failed or 
not, and if it is judged that there is a failure, it will be notified to the driver by displaying the information of fault on 
the meter cluster as well as memorizing the failed section as a diagnosis code, and starts control during the fail- 
ure. 
In the control during the failure, the functions of the system will be limited to secure the safety of the vehicle and 
the driver. The diagnosis code can be read out from the blinking of the warning lamp. 
Parts name 
Major function and operation 
Accelerator pedal position 
sensor 
Accelerator pedal position 
sensor-1 
Detection of accelerator pedal application 
Accelerator pedal position 
sensor-2 <4D3> 
Accelerator pedal switch 
Detection of accelerator pedal release/application 
Vehicle speed sensor 
Detection of vehicle speed 
SLD ECU 
Control of speed limitation 
Engine ECU 
Control of engine 
Warning lamp 
Display of system failure 
STRUCTURE AND OPERATION 
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54 
54-0-5 
3.4 SLD ECU connection diagram 
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