Page 1841 of 4323
I28461
ECM:
E5
TACH
I28569C5±23
Combination Meter:
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1639
1833 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check harness and connector (ECM ± combination meter).
PREPARATION:
(a) Disconnect the C5 connector of the combination meter.
(b) Disconnect the E5 connector of the ECM.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection (Symbol)Specified Condition
C5±23 ± E5±1 (TACH)Below 1 W
C5±23 ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Replace ECM (See page IN±35).
Page 1842 of 4323
I28560
F19
Fuel SenderCombination Meter
C6 C5
12 26
11
C6 BB1
J8
J/C
IEJ49 J48
BB1
1F 1D96
BR W±B Y±B Y±B Y±BVV V
1 4
2 3AG J/C
A G
AJ49 J48 DI±1640
± DIAGNOSTICSCOMBINATION METER SYSTEM
1834 Author: Date:
2005 SEQUOIA (RM1146U)
Malfunction in fuel receiver gauge
CIRCUIT DESCRIPTION
The fuel sender has a variable resistance mechanism. The resistance decreases when the fuel amount in-
creases, and the resistance increases when the fuel amount decreases.
The fuel receiver gauge changes based on the resistance of the fuel sender.
WIRING DIAGRAM
DID91±01
Page 1843 of 4323

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1641
1835 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the hand±held tester and start from step 3 when not using the
hand±held tester.
1 Perform active test by hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand±held tester main switch ON.
CHECK:
From the display on the tester, perform the ºACTIVE TESTº.
METER:
ItemTest DetailsDiagnostic Note
FUEL GAUGEEMPTY, 1/2, FULLConfirm that the vehicle is stopped and engine is
idling.
OK:
Fuel receiver gauge readings change according to hand±held tester operation.
NG Replace combination meter
(See page IN±24).
OK
2 Read value of hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand±held tester main switch ON.
CHECK:
Operate the hand±held tester according to the steps on the display and select ºDATA LISTº.
METER:
ItemMeasurement Item /
Range (Display)Normal ConditionDiagnostic Note
FUEL GAUGEFuel Input /
Min.: 0 Max.: 255Tester indication changes accord-
ing to the fuel receiver gauge
angle.
OK:
Fuel value signal displayed on the tester is almost the same as the needle indication.
NG Replace combination meter
(See page IN±24).
OK
Page 1844 of 4323
I28574
F
Float
E
321
DI±1642
± DIAGNOSTICSCOMBINATION METER SYSTEM
1836 Author: Date:
2005 SEQUOIA (RM1146U)
3 Inspect fuel receiver gauge.
PREPARATION:
Remove the fuel sender gauge assy.
CHECK:
(a) Measure the resistance between terminals 2 and 3 of the
connector according to the value(s) in the table below.
OK:
Float levelSpecified condition
F3 to 5 W
E107.5 to 112.5 W
NG Replace fuel sender gauge.
OK
Page 1845 of 4323
I28569C5±26
Combination Meter:
I28570C6±12
Combination Meter:
C6±11
I28575
Fuel Sender Gauge
Connector Front View:
F19
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1643
1837 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check harness and connector (Fuel sender gauge ± combination meter).
PREPARATION:
Disconnect the combination meter connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified condition
C5±26 ± F19±2AlwaysBelow 1 W
C6±11 ± F19±3AlwaysBelow 1 W
C6±12 ± Body groundAlwaysBelow 1 W
C5±26 ± Body groundAlways10 kW or higher
C6±11 ± Body groundAlways10 kW or higher
NG Repair or replace harness or connector.
OK
Replace combination meter
(See page IN±35).
Page 1846 of 4323

DI±1644
± DIAGNOSTICSCOMBINATION METER SYSTEM
1838 Author: Date:
2005 SEQUOIA (RM1146U)
Malfunction in engine coolant temperature receiver gauge
CIRCUIT DESCRIPTION
The ECM receives an engine coolant temperature signal from the engine coolant temperature sensor and
sends it to the A/C ECU.
The combination meter receives the signal from the A/C ECU through multiplex communication. Therefore,
if a malfunction occurs in the engine coolant temperature receiver gauge, there may be a malfunction in the
multiplex communication system, air conditioning system, or engine system.
(Multiplex communication system: See page DI±1892)
(Air conditioning system: See page DI±2301)
(Engine system: See page DI±9)
INSPECTION PROCEDURE
1 Perform active test by hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand±held tester main switch ON.
CHECK:
From the display on the tester, perform the ºACTIVE TESTº.
METER:
ItemTest DetailsDiagnostic Note
COOLANT TEMPHIGH / NORMAL / LOW (OFF)Confirm that the vehicle is stopped and engine is
idling.
OK:
Engine coolant temperature receiver gauge readings change according to hand±held tester op-
eration.
OK Go to engine system or air conditioning system
(See page DI±9 or DI±2301).
NG
Replace combination meter
(See page IN±35).
DID92±01
Page 1847 of 4323
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1645
1839 Author: Date:
2005 SEQUOIA (RM1146U)
Operating light control rheostat does not change light brightness
CIRCUIT DESCRIPTION
Illumination intensity of the meter is increased by turning the knob of the light control rheostat switch clock-
wise, and it is decreased by turning the knob counterclockwise.
DID93±01
Page 1848 of 4323
I28561
R6
Rheostat
To Each
Illumination Parts
To Each
Illumination Parts
Instrument Panel J/B
Combination Meter
I18
Ignition SW J8
J/C
Sub J/B No. 3
F10
Fusible Link Block
Engine Room J/B
Battery
IET
ILL±
E
TR
IG C5
C612 22
24
C6
Illumination 1F
1J 1C1D 1H
1C
1C8
2
11 9
34 13
6
IGN1
AM11H 1E
1C4
1 1F
1L 6
7 56
12
2DECU±IG
2188
3A 3E
8
4
51 3 4
5 6
ALT
AM2 IG2
AM2 11
2C A
A
AM1 IG1
G
W±G
W±B
BR W±G
W±G
W±BW±G
B±R
B±YB±O
B±R
W
W±L
W±RB±R
BW±RB DI±1646
± DIAGNOSTICSCOMBINATION METER SYSTEM
1840 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM