2001 TOYOTA SEQUOIA engine

I28557
I18
Ignition SWInstrument Panel J/BCombination Meter
Engine Room J/B
Sub J/B No. 4
IEBattery J8
J/CIA5 F10
Fusible
Link BlockC6
C5 C6
C6
C5 1F
1J
1C1D
1H
1C
1C1D
1D
1J
1J
2C 2D
222C
4B 4A AM2IG2
ST2
(*1) (*2)
W±B
W±R
B±R
B±WBR
B±O W±R
B±R
W±R W±RB±R
B±R B
AB
B
BB 893
98
2
1 1
1 4
5Short Pin
ECU±B
AM2
STA 4 5
8 211 9
37 6
53 396
IGN1
IGN212
23
24
28
Engine Room R/B
*1: Head (USA)
*2: Tail (CANADA)
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1629
1823 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

DI±1630
± DIAGNOSTICSCOMBINATION METER SYSTEM
1824 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check fuse.
CHECK:
Measure the resistance of the IGN2 fuse and IGN1 fuse in the instrument panel J/B.
OK:
Below 1 W
CHECK:
Measure the resistance of the STA fuse in the engine room R/B.
OK:
Below 1 W
CHECK:
Measure the resistance of the ECU±B fuse and AM2 fuse in the engine room R/B.
OK:
Below 1 W
NG Inspect for short circuit in harness and all com-
ponents connected to fuse.
OK

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1637
1831 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 to the 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
TACHOMETER0 rpm / 1,000 rpm / 2,000 rpm / 3,000 rpm / 4,000
rpm / 5,000 rpm / 6,000 rpm / 7,000 rpmConfirm that the vehicle is stopped and engine is
idling.
OK:
Tachometer readings change according to hand±held tester operation.
NG Replace combination meter
(See page IN±35).
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
TACHO METEREngine RPM /
Min.: 0 rpm Max.: 12,750 rpmAlmost the same as actual engine
speed (When engine is running)
OK:
Engine speed displayed on the tester is almost the same as the actual engine speed.
OK Replace combination meter
(See page IN±35).
NG

I28571
C5±23
Combination Meter:
I28567
GND
DI±1638
± DIAGNOSTICSCOMBINATION METER SYSTEM
1832 Author: Date:
2005 SEQUOIA (RM1146U)
3 Inspect combination meter.
PREPARATION:
(a) Check the input signal waveform.
(1) Remove the combination meter with the connectors
connected.
(2) Connect the oscilloscope to terminal C5±23 and
body ground.
(3) Start the engine.
CHECK:
Check signal waveform according to the condition(s) in the
table below.
ItemCondition
Tool setting5 V/DIV, 10 ms/DIV
Vehicle conditionEngine idle speed
OK:
Waveform appears as shown in the illustration.
HINT:
As engine speed increases, the cycle of the signal waveform
narrows.
OK Replace combination meter
(See page IN±35).
NG

± 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

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

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

I28562
Combination Meter
Instrument Panel J/B
Engine Room J/B I18
Ignition SW Front Seat
Inner Belt
(Buckle
SW LH)
*1: w/ Power Seat
*2: w/o Power Seat Battery
BH IEJ8
J/C
F10
FLB BI2J24
J/C
4
5
BB B
B
AC5
C6
12 24
C64
Seat
BeltBuzzer
2D2C 11
AM2 1F 1C
1D1H
1C
1J 211
9 3
7
6 IGN1
56
AM2 IG2
W±BB±O
BR
W±R W±B
(*1)(*2)
W±B
(*1) W±B
(*1)(*1) (*2) (*1)(*1) (*1) G±Y G±YG±Y
(*2)
1 33 213
B16 B16 B16 B16
W±RG±Y
B±R W±RBI2 IN1
313
W±B
(*2)
DI±1650
± DIAGNOSTICSCOMBINATION METER SYSTEM
1844 Author: Date:
2005 SEQUOIA (RM1146U)
Seat belt warning for driver's seat does not operate
CIRCUIT DESCRIPTION
A buzzer and indicator are included in the seat belt warning system. When the ignition switch is ON and the
seat belt on the driver side is not fastened, both the buzzer and indicator operate.
The buzzer and indicator are built into the combination meter.
WIRING DIAGRAM
DID94±01