TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±869
1063 Author: Date:
2005 SEQUOIA (RM1146U)
18 Replace tire pressure monitor ECU and check DTC.
PREPARATION:
(a) Replace the tire pressure monitor ECU (see page SA±20).
(b) Clear the DTCs.
CHECK:
Check for a DTC.
OK:
DTC is not output.
NG Replace tire pressure monitor valve sub±assy
(See page SA±16).
OK
End

F19792
Combination Meter
Tire Pressure Monitor ECU
To BatterySPD G±O3
T17 C520
IEInstrument Panel J/BG±O
J8
J/C
AIF 10
1
1H11
T17GND
IG W±B W±B
T17 J17
J/C
BB
2 DI±870
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1064 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C2191/91 Vehicle Speed Signal Error
CIRCUIT DESCRIPTION
The tire pressure monitor ECU receives a speed signal from the combination meter. This DTC is stored upon
entering test mode but erased when a vehicle speed signal of 12 mph (20 km/h) is detected for 3 seconds
or more. The DTC is output only in test mode.
DTC No.DTC Detecting ConditionTrouble Area
C2191/91Speed sensor circuit malfunction.

Vehicle speed sensor

Combination meter assy

Tire pressure monitor ECU

Wire harness
WIRING DIAGRAM
DIDKE±01

F19136
Tire Pressure Monitor ECU:
T17
SPD
F19755
C5±20Combination
Meter
C5
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±871
1065 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
NOTICE:
It is necessary to register an ID code after replacing the tire pressure monitor valve sub±assy and/or
the tire pressure monitor ECU (see page DI±805).
HINT:
When not using the hand±held tester, go to step 2.
1 Read value on hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position, and push the hand±held tester main switch ON.
(c) Select the item below in the DATA LIST, and read its value displayed on the hand±held tester.
TIRE PRESSURE:
ItemNormal Condition
VEHICLE SPEEDActual vehicle speed
CHECK:
Check that the values indicated on the tester and the combination meter are the same.
OK:
Indicates actual speed.
OK Replace tire pressure monitor ECU
(See page SA±20).
NG
2 Check harness and connector (Tire pressure monitor ECU ± Combination meter
assy).
PREPARATION:
Disconnect the combination meter assy C5 connector and tire
pressure monitor ECU T17 connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
T17±3 (SPD) ± C5±20Below 1 W
T17±3 (SPD) ± Body ground10 kW or higher

F19138
Tire Pressure Monitor ECU:
SPD
GND
T17
9 to 14 V
0
Turn the wheel
DI±872
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1066 Author: Date:
2005 SEQUOIA (RM1146U)
NG Repair or replace harness or connector.
OK
3 Inspect tire pressure monitor ECU.
PREPARATION:
Remove the tire pressure monitor ECU with connectors still
connected.
CHECK:
Check voltage.
(1) Shift the shift lever to neutral.
(2) Jack up one of the front wheels.
(3) Turn the ignition switch to the ON position.
(4) Measure the voltage between terminals SPD and
GND of the tire pressure monitor ECU when the
front wheel is turned slowly.
OK:
Voltage is generated intermittently.
HINT:
As the vehicle speed (wheel revolution speed) increases, a
cycle of the waveform narrows.
NG Check combination meter assy (Speed signal
circuit) (See page SA±20).
OK
Replace tire pressure monitor ECU
(See page SA±20).

F19174
Combination MeterTire Pressure
Monitor ECU
Engine Room J/B I18
Ignition SW IGN1
B±O
IG2 AM2 1C11
Battery 2
1H
T17 C5GR±L
Tire Pressure
B±R
B 56
54AM2 24
6IND Instrument Panel J/B
C620
2D1
2C1 1C3
1J7
F10
Fusible Link BlockInstrument Panel J/B
W±R
W±R
B
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±873
1067 Author: Date:
2005 SEQUOIA (RM1146U)
Tire Pressure Warning Lamp Circuit
CIRCUIT DESCRIPTION
If the ECU detects trouble, the tire pressure warning lamp comes on and tire pressure monitor is cancelled
at the same time. At this time, the ECU records a DTC in memory.
Connect terminals Tc and CG of the DLC3 to make the tire pressure warning lamp blink and output the DTC.
WIRING DIAGRAM
DIDKF±01

F19136
Tire Pressure Monitor ECU:
T17
IND
F19755
C5±20
Combination
Meter
C5
DI±874
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1068 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
NOTICE:
It is necessary to register an ID code after replacing the tire pressure monitor valve sub±assy and/or
the tire pressure monitor ECU (see page DI±805).
HINT:
This procedure must be performed according to the PROBLEM SYMPTOMS TABLE.
1 Check harness and connector (Tire pressure monitor ECU ± Combination meter
assy).
PREPARATION:
Disconnect the tire pressure monitor ECU T17 connector and
C5 combination meter.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
T17±6 (IND) ± C5±20Below 1 W
T17±6 (IND) ± Body ground10 kW or higher
NG Repair or replace harness or connector (Com-
bination meter to tire pressure monitor ECU).
OK
Proceed to next circuit inspection shown in problem symptoms table (See page DI±814).

F19790
Combination MeterTire Pressure
Monitor ECU
Engine Room J/B I18
Ignition SWIGN1
B±O
IG2AM2 1C11
Battery 2
1HT17
C5GR±L
Tire Pressure
B±R
B 56
54AM2 24
6IND Instrument Panel J/B
C620
2D1
2C1 1C3
1J7
F10
Fusible Link BlockInstrument Panel J/B
W±R
W±R
B
T17 T18 Tire Pressure
Warning Reset SW
G±R
CALSW
GND
T17 1H
1H
1F7
1 10
W±B11 10 Instrument Panel J/B
W±B
A J8
J/C
IE1 2
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±875
1069 Author: Date:
2005 SEQUOIA (RM1146U)
Tire Pressure Warning Reset Switch Circuit
CIRCUIT DESCRIPTION
Receiving the signal from the tire pressure warning reset switch, the tire pressure monitor ECU indicates the
initialization of the pressure warning system.
WIRING DIAGRAM
DIDKG±01

F19144
Tire Pressure Warning Reset Switch
ON
OFF2
1
DI±876
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1070 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
NOTICE:
It is necessary to register an ID code after replacing the tire pressure monitor valve sub±assy and/or
tire pressure monitor ECU (see page DI±805).
1 Check tire pressure warning reset switch function.
CHECK:
Perform the tire pressure warning reset switch test in TEST MODE PROCEDURE (see page DI±810).
OK:
Reset switch ON: Tire pressure warning lamp comes on.
Reset switch OFF: Tire pressure warning lamp blinks.
NG Go to step 2.
OK
End.
2 Inspect tire pressure warning reset switch.
PREPARATION:
Disconnect the tire pressure warning reset switch connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the tire
pressure warning reset switch when the tire pressure warning
switch is ON and OFF.
OK:
Switch ConditionSpecified Condition
ONBelow 1 W
OFF10 kW or higher
NG Replace tire pressure warning reset switch.
OK

F19884
Tire Pressure Warning Reset Switch
(harness side connector)
Tire Pressure Monitor ECU:T18
CALSW
T17
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±877
1071 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check harness and connector (Tire pressure warning reset switch ± Tire pres-
sure monitor ECU)
PREPARATION:
Disconnect the tire pressure warning reset switch T18 connec-
tor and tire pressure monitor ECU T17 connector .
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
T17±10 (CALSW) ± T18±1Below 1 W
T17±10 (CALSW) ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Replace tire pressure monitor ECU
(See page SA±20).

F19175
Tire Pressure
Monitor ECU
IG
GND T17
11 B±R
I18
Ignition SW
2
AM1
8 W
BatteryT172 8
3C
A
A J37
J/C
B±R
IG11 ECU±IG B±R
B±Y
1
52 AM1
ALT
BW±B
A
J8
J/C W±BW±L
F10
Fusible Link BlockInstrument Panel J/B8
3A
4
1F4
1C
1
1L6
1C Instrument Panel J/B
IE10
1F1
1H Instrument Panel J/B Sub J/B No. 3 DI±878
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1072 Author: Date:
2005 SEQUOIA (RM1146U)
ECU Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the tire pressure monitor ECU. It also supplies power to the tire pressure monitor
receiver via the ECU.
WIRING DIAGRAM
DIDKH±01