Page 1037 of 4323
F19171
Tire Pressure
Monitor ECU Tire Pressure Monitor
Valve Sub±assy Front LH
Tire Pressure Monitor
Valve Sub±assy Rear LH Tire Pressure Monitor
Valve Sub±assy Front RH
Tire Pressure Monitor
Valve Sub±assy Rear RHJ29A
H
J30 3
4
5 BD2
5
1
4 +5V
RDA
GNDL
V
BR±R T19
Tire Pressure
Monitor Receiver
BD2
BD2L
VL
RF5V
RDA
GND2
Tire Pressure Monitor
Valve Sub±assy SpareJ29C J29B
I
J30
J
J30 BR±RBR±R J/C
T178
T177
T1716 V
: Radio Signal
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±835
1029 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT DESCRIPTION
The tire pressure monitor valve sub±assy constantly sends radio waves to the tire pressure monitor receiver
assy. If the battery for the tire pressure monitor valve sub±assy is depleted, or if the tire pressure monitor
receiver assy is defective or comes off, the DTC will be output. DTCs C2121/21 to C2125/25 can only be
deleted by the tester. DTCs C2181/81 to C2185/85 can be deleted when the transmitter sends a force trans-
mission signal or the test mode ends. DTCs C2181/81 to C2185/85 are output only in the test mode.
DTC No.DTC Detecting ConditionTrouble Area
C2121/21
C2122/22
C2123/23
C2124/24
C2125/25A DTC is detected when the ECU receives no signals for
51 minutes or more, the vehicle speed is 5 mph (8 km/h) or
higher, and the ECU receives no signals for 12 minutes or
more.Tire pressure monitor receiver assy
Each tire pressure monitor valve sub±assy
Tire pressure monitor ECU
Wire harness
C2181/81
C2182/82
C2183/83
C2184/84
C2185/85
Malfunction in the transmitting/receiving circuit
Tire pressure monitor receiver assy
Each tire pressure monitor valve sub±assy
Tire pressure monitor ECU
Wire harness
HINT:
It is necessary to perform the procedure to identify the tire pressure monitor valve sub±assy that is malfunc-
tioning because it cannot be identified by the output DTC.
WIRING DIAGRAM
Page 1038 of 4323
DI±836
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1030 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:
Set the tire pressure to the specified value.
1 Check tire pressure warning lamp.
PREPARATION:
Turn the ignition switch to the ON position.
CHECK:
Check the tire pressure warning lamp.
RESULT:
Does not blinkA
Comes on and goes off repeatedly at 0.5 second intervalsB
B Go to step 4.
A
2 Clear DTC (See page DI±820).
NEXT
3 Check DTC (See page DI±820).
CHECK:
Check for a DTC.
OK:
DTC is not output.
NG Go to step 4.
OK
Check problem symptoms table
(See page DI±814).
Page 1039 of 4323
F19136
Tire Pressure Monitor ECU:
T17
RF5V
GND2RDA
F19137
Tire Pressure Monitor Receiver Assy:
T19
+5V
GNDRDA
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±837
1031 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check DTC (See page DI±820).
CHECK:
Check if DTCs C2121/21, C2122/22, C2123/23, C2124/24 and C2125/25 are all output.
No Go to step 10.
Ye s
5 Check harness and connector (Tire pressure monitor receiver assy ± Tire pres-
sure monitor ECU).
PREPARATION:
Disconnect the tire pressure monitor receiver assy T19 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±7 (RDA) ± T19±1 (RDA)Below 1 W
T17±8 (RF5V) ± T19±5 (+5V)Below 1 W
T17±16 (GND2) ± T19±4 (GND)Below 1 W
T17±7 (RDA) ± Body ground10 kW or higher
T17±8 (RF5V) ± Body ground10 kW or higher
T17±16 (GND2) ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Page 1040 of 4323
F19138
Tire Pressure Monitor ECU:
T17
RF5V
GND2
DI±838
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1032 Author: Date:
2005 SEQUOIA (RM1146U)
6 Inspect tire pressure monitor ECU.
PREPARATION:
(a) Connect the tire pressure monitor ECU T17 connector.
(b) Turn the ignition switch to the ON position.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Tester ConnectionConditionSpecified Condition
T17±8 (RF5V) ±
T17±16 (GND2)Ignition Switch ON4.5 to 5.5 V
NG Check power source circuit
(See page DI±878).
OK
7 Replace tire pressure monitor receiver assy (See page SA±13).
HINT:
Perform the inspection using parts from a normal vehicle when possible.
NEXT
8 Check DTC (See page DI±820).
PREPARATION:
Clear the DTCs.
CHECK:
Check for a DTC.
OK:
DTC is not output.
OK End
NG
Page 1041 of 4323
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±839
1033 Author: Date:
2005 SEQUOIA (RM1146U)
9 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
10 Set tire pressure to normal value.
PREPARATION:
Set the tire pressure of all wheels to the specified value.
Tire sizeFrontRearSpare
P245 / 70 R 16220 kPa (2.2 kgf/cm2, 32 psi)240 kPa (2.4 kgf/cm2, 35 psi)240 kPa (2.4 kgf/cm2, 35 psi)
P265 / 70 R 16220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)
P265 / 65 R 17220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)
NEXT
11 Identify transmitter corresponding to DTC (See page DI±881).
NEXT
Page 1042 of 4323
F19140
Example:
A
BFront
F19139
Example:
Front
A
DI±840
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1034 Author: Date:
2005 SEQUOIA (RM1146U)
12 Interchange tires.
PREPARATION:
Interchange tire ºAº with a defective tire pressure monitor valve
sub±assy with tire ºBº with a normal one.
HINT:
If tire ºAº (left front ) is identified in step 11.
NEXT
13 Set tire pressure to normal value.
PREPARATION:
Set the tire pressure of all wheels to the specified value.
Tire sizeFrontRearSpare
P245 / 70 R 16220 kPa (2.2 kgf/cm2, 32 psi)240 kPa (2.4 kgf/cm2, 35 psi)240 kPa (2.4 kgf/cm2, 35 psi)
P265 / 70 R 16220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)
P265 / 65 R 17220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)
NEXT
14 Forcibly transmit transmitter ID.
PREPARATION:
Remove the valve core of tire ºAº, rapidly reduce the tire pres-
sure and forcibly transmit the transmitter ID of the tire pressure
monitor valve sub±assy.
NEXT
Page 1043 of 4323
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±841
1035 Author: Date:
2005 SEQUOIA (RM1146U)
15 Check DTC again (See page DI±820).
CHECK:
Check for a DTC.
OK:
DTC is not output.
HINT:
If a DTC is output, replace the identified tire pressure monitor valve sub±assy.
Before installing a new tire pressure monitor valve sub±assy, read and write down its transmitter ID.
Register the transmitter ID after replacement and then set the tire pressure to the specified value (see
page DI±805).
NG Replace tire pressure monitor valve sub±assy
(See page SA±16).
OK
Replace tire pressure monitor receiver assy
(See page SA±13).
Page 1044 of 4323
DI±842
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1036 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C2141/41 Transmitter ID1 Error
DTC C2142/42 Transmitter ID2 Error
DTC C2143/43 Transmitter ID3 Error
DTC C2144/44 Transmitter ID4 Error
DTC C2145/45 Transmitter ID5 Error
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C2141/41
C2142/42
C2143/43
C2144/44
C2145/45
If an ºERRORº signal is received 3 times consecutively, the
tire pressure monitor valve sub±assy will be judged as de-
fective and these DTCs will be output.
This will happen under the situations where the inflation
pressure is out of the specified range 0 to 637.5 kPa (0 to
6.48 kgf/cm
2, 0 psi to 92.2 psi), the temperature inside the
tire is out of the specified range ±40 to 215C (±40 to 419
F), or an error occurs in the tire pressure monitor valve
sub±assy, etc.
Tire pressure monitor valve sub±assy
Tire pressure monitor ECU
Tire pressure monitor receiver assy
HINT:
It is necessary to perform the procedure to identify the tire pressure monitor valve sub±assy that is malfunc-
tioning because it cannot be identified by the output DTC.
DIDK9±01
