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FOREWORD 
This Shop Manual is published for the information and 
guidance of personnel responsible for maintenance of 
ROSA series bus, 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. 
In addition to this manual, you can also refer to the follow- 
ing manuals when performing service: 
• Diesel Engine ROSA BE6 4D3 
........ ....... ............ ....... . Pub. No. TWDE0217 
• Petrol Engine ROSA BC6 4G64 
........ ....... ............ ....... . Pub. No. TWDE9507-1 
• Chassis ROSA BE6. BC6 
........ ....... ............ ....... . Pub. No. TWSE0329 
• Electrical ROSA BE6. BC6 
.. ................... .............. Pub. No. THSE0314 
For more details, please consult your nearest authorized 
Mitsubishi dealer or distributor. 
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. 
Dec. 2003 
Applicable model 
BE 
BC 
©2003 Mitsubishi Fuso Truck & Bus Corporation Printed in Japan 
GROUP INDEX 
HOW TO READ THIS MANUAL 
PRECAUTIONS FOR MAINTENANCE 
OPERATIONS ........................ .... ....... .... 
POWER, CHARGE AND GROUND .. .... 
ENGINE STARTING, 
PREHEATING AND STOPPING ........... 
LIGHTING ... ....... .... ... .... .... ... .... .... ... .... .. 
METER ... .... ....... .... ... .... .... ... .... .... ... .... .. 
INDICATOR AND WARNING ............... 
BODY SIDE ELECTRICAL .... .... .. ... .... .. 
CHASSIS ELECTRICAL ...................... 
ENGINE AND TRANSMISSION 
ELECTRICAL ... .... ....... .... ....... .... ....... .... 
OTHERS ................................................ 
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CONTENTS 
HOW TO READ THIS MANUAL 
HOW TO READ THIS MANUAL .... ... .... ... 54-00-1 
How this manual is complied .......................... 54-00-2 
How this manual is structured ....................... 54-00-3 
Terms and units ............................................. 54-00-14 
Connectors .................................................... 54-00-16 
PRECAUTIONS FOR MAINTENANCE 
OPERATIONS .... .... ....... .... ....... .... ....... ... 54-00-70 
54-01 POWER, CHARGE AND 
GROUND 
SPECIFICATIONS .... ... .... .... ... .... .... ... .... ... 54-01-2 
STRUCTURE AND OPERATION ...... .... . 54-01-3 
TROUBLESHOOTING ............ .... ....... ... 54-01-10 
ON-VEHICLE INSPECTION AND 
ADJUSTMENT 
Alternator inspection ..................................... 54-01-12 
Regulator inspection ...................................... 54-01-13 
BATTERY ............ .... ...................... 54-01-14 
FUSE .. ....... .... ....... .... ....... .... ....... ... 54-01-18 
ALTERNATOR ............................. 54-01-22 
POWER SUPPLY CIRCUIT .......... 54-01-40 
RESERVE POWER CIRCUIT ....... 54-01-50 
BATTERY CHARGING 
CIRCUIT .. .... .... ... .... .... ... .... .... ... .... . 54-01-54 
GROUND .... .... ... .... .... ... .... .... ... .... . 54-01-58 
54-02 ENGINE STARTING, 
PREHEATING AND 
STOPPING 
SPECIFICATIONS .... ... .... .... ... .... .... ... .... ... 54-02-2 
STRUCTURE AND OPERATION .. ... .... ... 54-02-3 
TROUBLESHOOTING .. .... ....... .... ....... ..... 54-02-5 
STARTER ... .... ... .... .... ... .... .... ... .... ... 54-02-6 
ENGINE START CIRCUIT <BE>... 54-02-20 
IGNITION CIRCUIT <BC> ............. 54-02-24 
ENGINE STOP CIRCUIT <BE> ..... 54-02-26 
ENGINE PREHEATING 
CIRCUIT <BE> ............. ....... .... ....... 54-02-29 
54-03 LIGHTING 
SPECIFICATIONS .................................... 54-03-2 
STRUCTURE AND OPERATION ............. 54-03-4 
TROUBLESHOOTING . ... .... .... ... .... .... ... .... 54-03-6 
ON-VEHICLE INSPECTION AND 
ADJUSTMENT 
Headlamp aiming .............................................. 54-03-9 
HEADLAMP CIRCUIT ................... 54-03-14 
FOG LAMP CIRCUIT .................... 54-03-18 
TAIL LAMP, CLEARANCE LAMP, 
AND LICENSE PLATE LAMP 
CIRCUIT ......................................... 54-03-22 
STOP LAMP CIRCUIT .................. 54-03-26 
TURN-SIGNAL LAMP AND 
HAZARD LAMP CIRCUIT ...... ....... 54-03-30 
BACKUP LAMP CIRCUIT .... ......... 54-03-34 
INTERIOR LIGHTING CIRCUIT .... 54-03-38 
ILLUMINATION LAMP CIRCUIT .. 54-03-42 
MARKER LAMP CIRCUIT ............ 54-03-44 
STEP LAMP CIRCUIT ................... 54-03-48 
54-04 METER 
SPECIFICATIONS .................................... 54-04-2 
TROUBLESHOOTING . ... .... .... ... .... .... ... .... 54-04-3 
METER CLUSTER .... .... ... .... .... ... .... 54-04-4 
TACHOMETER CIRCUIT .............. 54-04-10 
SPEEDOMETER CIRCUIT ............ 54-04-14 
TACHOGRAPH CIRCUIT ............. 54-04-18 
FUEL GAUGE CIRCUIT ................ 54-04-20 
WATER TEMPERATURE GAUGE 
CIRCUIT ......................................... 54-04-24 
100 
101 
104 
106 
110 
115 
125 
130 
201 
210 
213 
215 
220 
300 
310 
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325 
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340 
345 
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349 
378 
401 
410 
412 
415 
420 
425 
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54-05 INDICATOR AND 
WARNING 
TROUBLESHOOTING .. .... ....... .... ....... ..... 54-05-2 
ON-VEHICLE INSPECTION AND 
ADJUSTMENT 
Inspection of the brake fluid tank 
assembly ........................................................... 54-05-4 
PARKING BRAKE CIRCUIT ... .... ... 54-05-6 
BRAKE WARNING CIRCUIT ......... 54-05-8 
ENGINE OIL PRESSURE 
CIRCUIT .. .... .... ... .... .... ... .... .... ... .... . 54-05-12 
BRAKE PAD WEAR INDICATION 
CIRCUIT .. .... .... ... .... .... ... .... .... ... .... . 54-05-16 
54-06 BODY SIDE ELECTRICAL 
SPECIFICATIONS .... ... .... .... ... .... .... ... .... ... 54-06-2 
SWITCHES 
(FOR USE BY PASSENGERS) ....................... 54-06-4 
MOTORS, ACTUATORS .. .... ... .... ... 54-06-8 
RELAYS ............... .... ....... .... ....... ... 54-06-12 
CONTROL UNITS, UNIT .... ..... .... . 54-06-18 
BUZZER, HORN .... .... ... .... .... ... .... . 54-06-20 
CIGARETTE LIGHTER CIRCUIT .. 54-06-22 
AUDIO CIRCUIT .. .... ....... .............. 54-06-24 
WIPER AND WASHER CIRCUIT .. 54-06-32 
HORN CIRCUIT . .... .... ... .... .... ... .... . 54-06-34 
HEATER CIRCUIT .......... .... ....... ... 54-06-38 
AIR CONDITIONER CIRCUIT ...... 54-06-44 
AUTOMATIC DOOR CIRCUIT ..... 54-06-52 
SEAT BELT CIRCUIT ................... 54-06-60 
CLOCK CIRCUIT ............... .... ....... 54-06-64 
BOTTLE COOLER CIRCUIT ........ 54-06-68 
ROOF VENTILATION CIRCUIT .... 54-06-72 
REAR WIPER AND WASHER 
CIRCUIT ......................................... 54-06-74 
54-07 CHASSIS ELECTRICAL 
SWITCHES ...................................... 54-07-2 
MOTORS AND ACTUATORS ......... 54-07-6 
BUZZERS AND HORN ................... 54-07-8 
MAGNETIC VALVE, SOLENOID .. 54-07-10 
OTHERS ........................................ 54-07-14 
EXHAUST BRAKE 
CIRCUIT <BE> ....... .... ....... .... ....... . 54-07-16 
54-08 ENGINE AND 
TRANSMISSION 
ELECTRICAL 
ENGINE ELECTRICAL . ... .... .... ... .... 54-08-2 
TRANSMISSION ELECTRICAL ..... 54-08-6 
54-09 OTHERS 
STRUCTURE AND OPERATION ............. 54-09-2 
MULTIPURPOSE TIMING 
CONTROL UNIT CIRCUIT .............. 54-09-4 
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625 
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652 
510 
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510 515 
515 
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616 
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652 
675 
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910 
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54-00-1 
HOW TO READ THIS MANUAL 
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54-00-2 
How this manual is complied 
• This manual is divided into the nine main groupes listed below. 
• Each group consists of specifications, information on structure and operation, troubleshooting instructions and service 
instructions in that order. The service instructions are divided according to index numbers. They consist of on-vehicle 
inspection and adjustment instructions, circuit drawings, vehicle layout drawings, service standards, T tightening 
torques, K lubricants and sealants, J special tools and service procedures in that order. 
• Page numbers start from 1 in each main group. 
Main 
group 
No. 
Group denomination 
Contents 
1 
Power, Charge and Ground 
• Battery and alternator 
• Power supply circuit from battery to fuses 
• Indication of devices and sub-circuits connected to fuses 
• Indication of frame grounding locations and ground sub-circuits 
2 
Engine Starting Preheating and 
Stopping 
•S 
t 
a 
r 
t 
e 
r 
• Engine starting, preheating and stopping circuits 
3 
Lighting 
• Headlamps and all other lamps 
• Lighting circuits 
4 
Meter 
• Speedometer, water temperature gauge, fuel gauge and other 
meters 
• Meter circuits 
5 
Indicator and Warning 
Indicator and warning circuits 
6 
Body Side Electrical 
• Electrical components fitted in the body (for example, combination 
switch, wiper relay, control unit, and buzzer) 
• Electrical devices and the related circuits fitted in (or related to) the 
body (for example, cigarette lighter, wipers, and heater) 
7 
Chassis Electrical 
• Electrical components fitted on the chassis (for example, fuel level 
sensor, back buzzer and 3-way magnetic valve, etc) 
• Electrical devices and the related circuits fitted on (or related to) 
the chassis (for example, exhaust brake system) 
8 
Engine and Transmission Electrical 
• Electrical components fitted on the engine and transmission (for 
example, engine revolution sensor, water temperature sensor, 
transmission neutral switch, etc) 
• Electrical devices and the related circuits fitted on (or related to) 
the engine and transmission (for example, transmission power 
take-off, etc) 
9 
Others 
Integrated control units used for system control Multipurpose timing 
control unit 
HOW TO READ THIS MANUAL 
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54-00-3 
54-00 
How this manual is structured 
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54-00-4 
0.85 
HOW TO READ THIS MANUAL 
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