TOYOTA SEQUOIA 2001 Service Repair Manual

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

I28569
C5±3
C5±28
Combination Meter:
I28570
C6±12
C6±24
C6±23
Combination Meter:
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1631
1825 Author: Date:
2005 SEQUOIA (RM1146U)
2 Inspect combination meter (Power source).
PREPARATION:
Disconnect the combination meter connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Terminal NoConditionSpecified condition
C6±12 ± Body groundAlwaysBelow 1 W
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Terminal NoConditionSpecified condition
C6±23 ± Body groundAlways10 to 14 V
C5±28 ± Body groundIgnition switch ON10 to 14 V
C6±24 ± Body groundIgnition switch ON10 to 14 V
C5±3 ± Body groundIgnition switch ST10 to 14 V
NG Repair or replace harness or connector.
OK
Replace combination meter
(See page IN±35).

I28558
C612
W±B
Battery AW
58BR
IECombination Meter
W±L I18
Ignition SW
2 1
AM1 IG1
B±Y
W Instrument Panel J/B
AM1
21 47
6 1 6
9 1C
1C
1D 1E
1L
1FR±L
R±LSub J/B No. 3
3B 3A515C524
C610 R±L
Y±RY
Y±RY
13
23 19
26
IG4
IG4
IG4
GAUGE
B V1
Vehicle Speed Sensor
(Combination Meter)
F10
Fusible Link Block
J8
J/C DI±1632
± DIAGNOSTICSCOMBINATION METER SYSTEM
1826 Author: Date:
2005 SEQUOIA (RM1146U)
Malfunction in speedometer
CIRCUIT DESCRIPTION
The speedometer detects vehicle speed based on a 4±pulse signal from the vehicle speed sensor.
WIRING DIAGRAM
DID8Z±01

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1633
1827 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
SPEED METER0 / 40 (24) / 80 (48) / 120 (72) / 160 (96) /
200 (120) km/h (mph)The needle position should be within the accept-
able tolerance.
OK:
Speedometer 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
SPEED METER
Vehicle Speedometer /
Min.: 0 km/h (0 mph)
Max.: 255 km/h (158 mph)Almost the same as actual vehicle
speed (When driving)
OK:
Vehicle speed displayed on the tester is almost the same as the actual vehicle speed.
OK Replace combination meter
(See page IN±35).
NG

N02332
1
2 3
DI±1634
± DIAGNOSTICSCOMBINATION METER SYSTEM
1828 Author: Date:
2005 SEQUOIA (RM1146U)
3 Inspect vehicle speed sensor.
PREPARATION:
(a) Disconnect the vehicle speed sensor connector.
(b) Connect the positive (+) lead from the battery to terminal
1 and the negative (±) lead to terminal 2.
(c) Connect the positive (+) lead from the tester to terminal
3 and the negative (±) lead to terminal 2.
(d) Rotate the shaft.
CHECK:
Check that voltage between terminals 2 and 3 changes from
approx. 0 V to16 V or more.
OK:
Voltage changes from approx. 0 V to 16 V
HINT:
The voltage should change 4 times for every revolution of the
speed sensor shaft.
NG Replace vehicle speed sensor.
OK

I28569
Combination Meter:
C5±24
I28570
Combination Meter:
C6±12
C6±10
I28573
Vehicle Speed Sensor
Wire Harness Side:
V1
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1635
1829 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check harness and connector (Vehicle speed sensor ± combination meter and
vehicle speed sensor ± battery).
PREPARATION:
Disconnect the combination meter connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified condition
C5±24 ± V1±3AlwaysBelow 1 W
C6±10 ± V1±2AlwaysBelow 1 W
C6±12 ± Body groundAlwaysBelow 1 W
C5±24 ± Body groundAlways10 kW or higher
C6±10 ± Body groundAlways10 kW or higher
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Tester connectionConditionSpecified condition
V1±1 ± Body groundIgnition switch OFFBelow 1 V
V1±1 ± Body groundIgnition switch ON10 to 14 V
NG Repair or replace harness or connector.
OK
Replace combination meter
(See page IN±35).

I28559
E5 C5 ECU
TACHCombination Meter
23 J/C
J14D
J15F
Y±G Y±G 1 DI±1636
± DIAGNOSTICSCOMBINATION METER SYSTEM
1830 Author: Date:
2005 SEQUOIA (RM1146U)
Malfunction in tachometer
CIRCUIT DESCRIPTION
The indication on the tachometer is based on information that the ECM receives from the crankshaft position
sensor.
WIRING DIAGRAM
DID90±01

± 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