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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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Page 5284 of 6020

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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Page 5285 of 6020

ELECTRICAL-BODY AND CHASSIS 8A-347
ENGINE COOLANT TEMPERATURE GAUGE (4JJ1-TC/4JK1-TC)
Refer to “Inspection and Repair” in this Manual for a detailed description of the coolant temperature gauge self-
diagnosis procedure.
1. No engine coolant temperature indicates at all
Checkpoint Trouble Cause Countermeasure
Replace the engine coolant
temperature sensor
Engine coolant temperature
sensor malfunction
NG
Replace the meter assembly
Gauge function
1. Disconnect the sensor 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 3
E41
and 16
B23
Open circuit or poor connector
contact
NG
NG
OK
OK
Engine coolant temperature
sensor continuity between
connector 3
E41 and the
ground
2. Engine coolant temperature gauge incorrect readings in all ranges
Replace the sensor
The sensor malfunction
NG
Engine coolant temperature
sensor resistance between
connector 3
E41 and the
ground when disconnecting
the connector (Specified
resistance should indicate)
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Page 5286 of 6020
8A-348 ELECTRICAL-BODY AND CHASSIS
TEMPERATURE GAUGE AND THERMO UNIT (HFV6)
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 8 B96
and 16
B23
Open circuit or poor connector
contact
NG
NG
OK
OK
PIM (Thermo unit) continuity
between connector 8
B96
and the ground
2. Temperature gauge incorrect readings in all ranges
Replace the thermo unit
Thermo unit malfunction
NG
PIM (Thermo unit) resistance
between connector 8
B96
and the ground when
disconnecting the connector
(Specified resistance should
indicate)
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Page 5287 of 6020
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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Page 5288 of 6020
8A-350 ELECTRICAL-BODY AND CHASSIS
FUEL GAUGE AND FUEL TANK UNIT (HFV6)
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 and 17
B96
Open circuit or poor connector
contact
NG
NG
OK
OK
PIM (Tank unit) continuity
between connector 17
B96
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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