TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±859
1053 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check DTC (See page DI±820).
CHECK:
(a) Check for a DTC.
OK:
DTC is not output.
HINT:

It is necessary to register an ID when replacing the tire pressure monitor ECU.

Read ID on the DATA LIST before removing the tire pressure monitor ECU. Register the ID to the new
tire pressure monitor ECU (see page DI±805).
NG Replace tire pressure monitor ECU
(See page SA±20).
OK
End

DI±860
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1054 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C2177/77 Initialization Incomplete
CIRCUIT DESCRIPTION
Initialization is necessary after replacing either ECU, tires with different tire pressure or tire pressure monitor
valve sub±assy, after rotating the tires, or when a new vehicle is delivered.
DTC No.DTC Detection ConditionTrouble Area
C2177/77Initialization is not complete after vehicle speed of 5mph
(8km/h) or more continues for 20 minutes or more (total).

Tire pressure monitor valve sub±assy

Tire pressure monitor ECU

Tire pressure monitor receiver assy

Wire harness
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 7.
A
2 Clear DTC (See page DI±820).
NEXT
DIDKD±01

± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±861
1055 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check DTC (See page DI±820).
CHECK:
Check for a DTC.
OK:
DTC C2177/77 is not output.
NG Go to step 4.
OK
Perform initialization (See page DI±808).
4 Check tire pressure warning lamp.
PREPARATION:
Turn the ignition switch to the ON position.
CHECK:
Check the tire pressure warning lamp comes on for 3 seconds and goes off.
RESULT:
Does not come onA
Comes onB
B Go to step 2.
A

F19136
Tire Pressure Monitor ECU:
T17
IND
F19755
C5±20C5
Combination
Meter
F19138
Tire Pressure Monitor ECU:
T17
IND
GND2
DI±862
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1056 Author: Date:
2005 SEQUOIA (RM1146U)
5 Check harness and connector (Tire pressure monitor ECU ± Combination meter).
PREPARATION:
Disconnect the tire pressure monitor ECU T17 connector and
C5 combination meter connector.
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 and connector.
OK
6 Inspect tire pressure monitor ECU.
PREPARATION:
Connect the tire pressure monitor ECU T17 connector.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Tester connectionConditionSpecified condition
T17±6 (IND) ±
T17±16 (GND2)Immediately after turning
the ignition switch ON
(within 3 seconds)
8 to 16V
NG Replace tire pressure monitor ECU
(See page SA±20).
OK
Repair or replace combination meter
(See Page DI±1610).

± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±863
1057 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check tire pressure warning lamp.
PREPARATION:
(a) Turn the ignition switch to the ON position.
(b) Enter TEST MODE (see page DI±810).
(c) Press the tire pressure warning reset switch for 1 second or more after switching to TEST MODE.
CHECK:
Does the tire pressure warning lamp come on while pressing the tire pressure warning reset switch?
RESULT:
Comes onA
Does not come onB
B Go to step 14.
A

DI±864
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1058 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check tire pressure warning lamp.
HINT:
Check all tires, including the spare, one at a time in this order: FR, FL, RR RL, Spare.
PREPARATION:
(a) Turn the ignition switch to the ON position.
(b) Rapidly reduce the pressure of the tires to approximately 120 kPa (1.2 kgf/cm
2, 35 psi).
(c) Check that the tire pressure warning lamp comes on for 1 second while rapidly reducing the pressure
or immediately after reducing the pressure.
(d) Note the check results.
(e) Set the tire pressure to the specified value.
CHECK:
Check that the tire pressure warning lamp comes on when each of the wheels is inspected.
RESULT:
Does not come on (All wheels)A
Does not come on (Some wheels)B
Comes on (All wheels)C
B Replace tire pressure monitor receiver assy
(See page SA±13).
HINT:
Replace the tire pressure monitor valve sub±assy for which the
tire pressure warning lamp did not come on during inspection.
C Perform initialization (See page DI±808).
A

F19136
Tire Pressure Monitor ECU:
T17
RF5V
GND2RDA
F19137
Tire Pressure Monitor Receiver Assy:
T19
+5V
GNDRDA
F19138
Tire Pressure Monitor ECU:
T17
RF5V
GND2
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±865
1059 Author: Date:
2005 SEQUOIA (RM1146U)
9 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:
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
10 Inspect tire pressure monitor ECU.
PREPARATION:
Connect the tire pressure monitor ECU T17 connector.
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

DI±866
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1060 Author: Date:
2005 SEQUOIA (RM1146U)
11 Replace tire pressure monitor receiver assy (See page SA±13).
NEXT
12 Check DTC (See page DI±820).
PREPARATION:
Clear the DTCs.
CHECK:
Check for a DTC.
OK:
DTC is not output.
OK End
NG
13 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

F19884
Tire Pressure Warning Reset Switch
(harness side connector)
Tire Pressure Monitor ECU:T18
CALSW
T17
F19144
Tire Pressure Warning Reset Switch
ON
OFF2
1
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±867
1061 Author: Date:
2005 SEQUOIA (RM1146U)
14 Check harness and connector (Tire pressure warning reset switch ± Tire pres-
sure monitor ECU).
PREPARATION:
Disconnect the tire pressure warning reset switch connector
T18 and tire pressure monitor ECU connector T17.
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
15 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

F19138
Tire Pressure Monitor ECU:
T17
CALSW
GND2
DI±868
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1062 Author: Date:
2005 SEQUOIA (RM1146U)
16 Inspect tire pressure monitor ECU.
PREPARATION:
Connect the tire pressure monitor ECU T17 connector.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Tester connectionConditionSpecified condition
T17±10 (CALSW) ±
T17±16 (GND2)IG Switch ON to OFF8 to 16 V
NG Repair or replace harness or connector.
OK
17 Check DTC (See page DI±820).
PREPARATION:
Clear the DTCs.
CHECK:
Check for a DTC.
OK:
DTC is not output.
OK End
NG