4JH1 ISUZU KB P190 2007 Workshop Repair Manual

8A-288 ELECTRICAL-BODY AND CHASSIS

PARTS LOCATION 4JH1-TC






















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8A-296 ELECTRICAL-BODY AND CHASSIS

CIRCUIT DIAGRAM 4JH1-TC (LHD) (JR405E) Sheet 1/2


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ELECTRICAL-BODY AND CHASSIS 8A-297

CIRCUIT DIAGRAM 4JH1-TC (LHD) (JR405E) Sheet 2/2









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ELECTRICAL-BODY AND CHASSIS 8A-307
PARTS LOCATION 4JH1-TC























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8A-336 ELECTRICAL-BODY AND CHASSIS

CIRCUIT DIAGRAM 4JH1-TC (LHD) Sheet 1/3


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ELECTRICAL-BODY AND CHASSIS 8A-337

CIRCUIT DIAGRAM 4JH1-TC (LHD) Sheet 2/3



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8A-338 ELECTRICAL-BODY AND CHASSIS

CIRCUIT DIAGRAM 4JH1-TC (LHD) Sheet 3/3



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8A-346 ELECTRICAL-BODY AND CHASSIS
TEMPERATURE GAUGE AND THERMO UNIT (4JA1T(L), 4JH1-TC, C24SE)
1. No temperature indicates at all

Checkpoint Trouble Cause Countermeasure


Replace the thermo unit

Thermo unit malfunction

NG


Replace the case baseboard
assy

Gauge function
1. Disconnect the unit connector then connect
3.4W bulb to wire harness
side with ground
2. Check indicating point when starter SW . is ON
position (Temperature
should indicate)

Gauge malfunction


Repair open circuit or
connector contact
Continuity between 1 E19
(C24SE : 1
E65 ) and 16
B23 (C24SE : 13 B24 )


Open circuit or poor connector
contact

NG
NG
OK
OK
Thermo unit continuity
between connector 1
E19
(C24SE : 1
E65 ) and the
ground



2. Temperature gauge incorrect readings in all ranges


Replace the thermo unit

Thermo unit malfunction

NG

Thermo unit resistance
between connector 1
E19
(C24SE: 1
E65 ) and the
ground when disconnecting
the connector (Specified
resistance should indicate)



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ELECTRICAL-BODY AND CHASSIS 8A-349
FUEL GAUGE AND FUEL TANK UNIT (C24SE, 4JJA1T(L), 4JH1-TC, 4JJ1-TC/4JK1-TC)
1. No fuel level indicates at all

Checkpoint Trouble Cause Countermeasure


Replace the tank unit

Open circuit inside the tank
unit

NG
Thermo unit malfunction

Replace the case baseboard
assy

Fuel gauge function
1. Disconnect the tank unit connector then connect
3.4W bulb to wire harness
side
2. Check indicating point when starter SW . is ON
position (Fuel level should
indicate)

Gauge malfunction


Repair open circuit or
connector contact
Continuity between
connectors 17
B23 (C24SE :
14
B24 ) and 3
F2


Open circuit or poor connector
contact

NG
NG
OK
OK

Tank unit continuity between
connector 3
F2 and ground




2. Fuel gauge gives incorrect readings in all ranges

Replace the tank unitTank unit malfunction
NG
Tank unit resistance position
with the float at checking
points (Specified resistance
should indicate)


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ELECTRICAL-BODY AND CHASSIS 8A-357

Without tachometer (4JA1T(L)/4JH1-TC)




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With tachometer (4JA1T(L)/4JH1-TC)




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