Page 5276 of 6020
8A-338 ELECTRICAL-BODY AND CHASSIS
CIRCUIT DIAGRAM 4JH1-TC (LHD) Sheet 3/3
RTW 78AXF005601
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Page 5277 of 6020
ELECTRICAL-BODY AND CHASSIS 8A-339
CIRCUIT DIAGRAM 4JA1T (L) (LHD) Sheet 1/4
RTW 78AXF020401
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Page 5278 of 6020
8A-340 ELECTRICAL-BODY AND CHASSIS
CIRCUIT DIAGRAM 4JA1T (L) (LHD) Sheet 2/4
RTW 78AXF020501
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Page 5279 of 6020
ELECTRICAL-BODY AND CHASSIS 8A-341
CIRCUIT DIAGRAM 4JA1T (L) (LHD) Sheet 3/4
RTW 78AXF020601
BACK TO CHAPTER INDEX TO MODEL INDEXISUZU KB P190 2007
Page 5280 of 6020
8A-342 ELECTRICAL-BODY AND CHASSIS
CIRCUIT DIAGRAM 4JA1T (L) (LHD) Sheet 4/4
RTW 78AXF020701
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Page 5281 of 6020
ELECTRICAL-BODY AND CHASSIS 8A-343
TROUBLESHOOTING
SPEEDOMETER
1. Speedometer and odometer do not function
Checkpoint Trouble Cause Countermeasure
Replace the vehicle speed
sensor
Vehicle speed sensor
malfunction
NG
Repair an open circuit in the
circuit or a poor connection at
the connectors Continuity between the vehicle
speed sensor and the meter,
or the fuse C14 (10A) and the
ground
Open circuit or poor connector
contact
Replace the case baseboard
assy
Use a meter tester to check
the speedometer function
Speedometer malfunction
NG
NG
OK
OK
Check the vehicle speed
sensor output
(4 pulses/1 rotation)
2. Speedometer pointer fluctuates
(May be wide fluctuation)
Replace the vehicle speed
sensor, or repair an open
circuit in the circuit or a
connectors Vehicle speed sensor
malfunction, or open circuit or
poor connector contact
NG
Replace the case baseboard
assy
Use a meter tester to check
the speedometer function
Speedometer malfunction
NG
OK
Check the speed sensor
output by using the
oscilloscope
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Page 5282 of 6020
8A-344 ELECTRICAL-BODY AND CHASSIS
3. Speedometer pointer jumps erratically
Checkpoint Trouble Cause Countermeasure
Replace the vehicle speed
sensor, or repair an open
circuit in the circuit or a poor
connection at the connectors Vehicle speed sensor
malfunction, or open circuit or
poor connector contact
NG
Replace the meter assembly
Use meter tester to check the
speedometer function
Speedometer malfunction
NG
OK
Check the vehicle speed
sensor output by using the
oscilloscope
Inspection of a Waveform by Oscilloscope
(Reference)
RTW 780SH000101
1. Connect a resistance of 1.3 to 5k ohm (1.4W or more)
between the harness side connectors 40
B23 and 16
B24 of the meter.
2. Install a speedometer tester.
3. Turn on the starter SW .
RTW 580SH002201
4. Check the waveform at the time when the vehicle speed is
at 60km/h.
4. Trip odometer does not reset
Replace the meter assembly
Faulty reset mechanism
NG
Check at other kilometer
figures given by meter tester
(Reset should be made to
zero kilometer)
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Page 5283 of 6020
ELECTRICAL-BODY AND CHASSIS 8A-345
TACHOMETER
1. Meter pointer fluctuates
(May be wide fluctuation)
Replace the meter assembly
Tachometer malfunction
NG
Use a meter tester to check
the tachometer function
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