2001 TOYOTA SEQUOIA Page 18

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).

± 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

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).

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

I28577
Wire Harness Connector
Front View:
R6
IG
T
E
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1647
1841 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 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
LIGHT RHEOSTATLight Control Rheostat /
Min.: 0 Max.: 255Light control rheostat switch is
Dark (0) " Bright (255)
OK:
Light brightness can be changed within the specified range by manual operation.
OK Replace combination meter.
(See page IN±35)
NG
2 Check harness and connector (Power source circuit).
PREPARATION:
Disconnect the R6 light control rheostat switch connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Terminal No. (Symbol)ConditionSpecified condition
R6±5 (E) ± Body groundAlwaysBelow 1 W
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Terminal No. (Symbol)ConditionSpecified condition
R6±4 (T) ± Body groundLight control switch
TAIL or HEAD10 to 14 V
R6±1 (IG) ± Body groundIgnition switch ON10 to 14 V
NG Repair or replace harness or connector.
OK

I28569
Combination Meter:
C5±22
I28577
Light Control Rheostat Switch
Wire Harness Front View:
R6
TR
I28571
Combination Meter :
C5±22
DI±1648
± DIAGNOSTICSCOMBINATION METER SYSTEM
1842 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check harness and connector (Light control rheostat switch ± combination me-
ter).
PREPARATION:
Disconnect the C5 and E4 connectors of the combination me-
ter.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection (Symbol)Specified Condition
C5±22 ± R6±3 (TR)Below 1 W
C5±22 ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
4 Inspect combination meter.
PREPARATION:
Reconnect the combination meter connector.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Tester connectionConditionSpecified condition
C5±22 ± Body groundIgnition switch ON, light
control switch OFF " ONBelow 1 V " 10 to 14 V
NG Replace combination meter
(See page IN±35).
OK

I28576
270°
Bright
0°
DarkR6
TR ILL±
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1649
1843 Author: Date:
2005 SEQUOIA (RM1146U)
5 Inspect light control rheostat switch.
PREPARATION:
(a) Reconnect the light control rheostat switch connector.
(b) Turn the ignition switch ON.
(c) Turn the light control switch to the TAIL or HEAD position.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Tester connection
(Symbol)ConditionSpecified condition
R6±3 (TR) ± Body ground
Rheostat knob turned fully
counterclockwise "
fully clockwise
Below 1 V " 10 to 14 V
R6±6 (ILL±) ± Body
groundRheostat knob turned fully
counterclockwise "
fully clockwise
Below 1 V " 10 to 14 V
NG Replace light control rheostat switch.
OK
Replace combination meter
(See page IN±35).

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1651
1845 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the hand±held tester and start from step 2 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
SEAT BELT BUZZROFF / ONConfirm that the vehicle is stopped and engine is
idling.
D BELT REMINDOFF / ONConfirm that the vehicle is stopped and engine is
idling.
OK:
Switch condition (ON/OFF) can be switched by ACTIVE TEST.
NG Replace combination meter
(See page IN±35).
OK