TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±809
1003 Author: Date:
2005 SEQUOIA (RM1146U)
(d) Confirm that initialization is complete using the hand±
held tester.
(e) Check that the pressure for each tire is displayed in INIT
THRESHOLD 1 to 5.
(f) Initialization is complete.

DIDKL±01
D05981DLC3
Hand±Held
Tester
F19915
DI±810
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1004 Author: Date:
2005 SEQUOIA (RM1146U)
TEST MODE PROCEDURE
1. ENTER TEST MODE
HINT:

Operation of the tire pressure warning reset switch can be
checked in TEST MODE.

During TEST MODE, the system is not initialized by push-
ing the tire pressure warning reset switch. The circuit of
the tire pressure warning reset switch can be inspected
during this mode.
(a) Make sure that the ignition switch is off.
(b) Connect the hand±held tester to DLC3.
(c) Turn the ignition switch to the ON position.
(d) Select the TEST MODE on hand±held tester.
(e) Perform tire pressure warning reset switch test.
(1) Push the tire pressure warning reset switch.
(2) Check the tire pressure warning indicator lamp.
Test SignalNormal Condition
Tire Pressure Warning Reset Switch
Switch ON: TPWS indicator come on

Switch OFF: TPWS indicator blinking

D05981DLC3
Hand±Held
Tester
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±811
1005 Author: Date:
2005 SEQUOIA (RM1146U)
2. PERFORM SIGNAL CHECK
HINT:

When entering signal check, the tire pressure monitor
ECU sets all the signal check DTCs first.
After completing signal check for each inspection item,
the DTCs that are determined normal by the tire pressure
monitor ECU will be erased.
The DTCs for other inspection items may not be erased
when only a certain signal is inspected.

When signal check returns back to normal mode, all the
signal check DTCs will be erased.
(a) Make sure that the ignition switch is off.
(b) Connect the hand±held tester to DLC3.
(c) Turn the ignition switch to the ON position.
(d) Select the SIGNAL CHECK on hand±held tester.

F19181
DI±812
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1006 Author: Date:
2005 SEQUOIA (RM1146U)
(e) Drive the vehicle at 12mph (20 km/h) or more for 10 se-
conds or more.
(f) Loosen the valve core and rapidly reducing the pressure
(20 kPa above/15 sec.).
HINT:
The transmitter ID can be transmitted by rapidly reducing the
tire air pressure.
(g) Check that the tire pressure warning system test mode
DTCs are erased.
SIGNAL
CHECK DTCTest SignalSignal Check DTC Clear Condition
C2181C2185Transmitter DataReceive DATA from the transmitter which has a registered ID
in TPWS ECU
C2191Vehicle Speed SignalVehicle speed of 12 mph (20 km/h) or more is detected for 3
seconds or more
(h) Result
HINT:
After the signal check is complete, check for a DTC and signal check DTC to confirm the system status.
SIGNAL CHECK DTC is outputRepair the faulty part and enter SIGNAL CHECK again
SIGNAL CHECK DTCs are clearedNo problem
(i) End of SIGNAL CHECK
After completing test mode (SIGNAL CHECK), turn the ignition switch OFF and disconnect the tester.

± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±813
1007 Author: Date:
2005 SEQUOIA (RM1146U)
DTC of SIGNAL CHECK (TEST DIAGNOSIS) function:
If a malfunction code is displayed during the test mode DTC check, check the circuit listed for that code. For
details of each code, refer to the ºSee Pageº under respective ºDTC No.º in the chart.
DTC No.
(See Page)Detection ItemTrouble Area
C2181/81
(DI±834)Transmitter ID1 not received

Tire pressure monitor receiver assy

Each tire pressure monitor valve sub±assy

Tire pressure monitor ECU

Wire harness
C2182/82
(DI±834)Transmitter ID2 not received

Tire pressure monitor receiver assy

Each tire pressure monitor valve sub±assy

Tire pressure monitor ECU

Wire harness
C2183/83
(DI±834)Transmitter ID3 not received

Tire pressure monitor receiver assy

Each tire pressure monitor valve sub±assy

Tire pressure monitor ECU

Wire harness
C2184/84
(DI±834)Transmitter ID4 not received

Tire pressure monitor receiver assy

Each tire pressure monitor valve sub±assy

Tire pressure monitor ECU

Wire harness
C2185/85
(DI±834)Transmitter ID5 not received

Tire pressure monitor receiver assy

Each tire pressure monitor valve sub±assy

Tire pressure monitor ECU

Wire harness
C2191/91
(DI±870)Vehicle speed signal error

Vehicle speed sensor

Combination meter assy

Tire pressure monitor ECU

Wire harness

DIDK1±01
DI±814
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1008 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during DTC check but the problem still occurs, check the circuits for each prob-
lem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
SymptomSuspected AreaSee page
Tire pressure warning system does not operate.
1. Tire pressure monitor valve sub±assy
2. Tire pressure monitor receiver assy
3. Power source circuit
4. Tc terminal circuit
5. Combination meter assy
6. Tire pressure monitor ECU±
±
DI±878
DI±888
BE±55
±
DTC check cannot be done.
1. Power source circuit
2. Tc terminal circuit
3. Tire pressure monitor ECUDI±878
DI±888
±
Tire pressure warning lamp malfunctions (Does not light up).
1. Power source circuit
2. Tire pressure warning lamp circuit
3. Combination meter assy
4. Tire pressure monitor ECUDI±878
DI±873
BE±55
±
Tire pressure warning lamp malfunctions (Remains ON).
1. Tire pressure check
2. Tire pressure monitor ECU connector poorly connected
3. Tire pressure warning lamp circuit
4. Combination meter assy
5. Tire pressure monitor ECUSA±3
±
DI±873
BE±55
±
Tire pressure warning lamp malfunctions (Blinking).
1. Check DTC
2. Tc terminal circuit
3. Test mode (SIGNAL CHECK)
4. Tire pressure monitor ECUDI±820
DI±888
DI±810
±
Initialization cannot be done.
1. Test mode (SIGNAL CHECK)
2. Tire pressure warning reset switch
3. Tire pressure monitor ECUDI±810
DI±875
±

DIDK2±01
F19129
T17
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±815
1009 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
HINT:
Inspect the connectors from the back side while the connectors are connected.
Symbols (Terminal No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
IG (T17±2) ±
GND (T17±11)B±R ± W±BIG power sourceIG switch ON10 to 14 V
SPD (T17±3) ±
GND (T17±11)G±O ± W±BVehicle speed signalVehicle is runningPulse generation
SIL (T17±4) ±
GND (T17±11)G±R ± W±BDiagnosis tester commu-
nication lineIG switch ON, when com-
munication is not per-
formed with a tester
8 V or more
IND (T17±6) ±
GND (T17±11)GR±L ± W±BTire pressure warning lamp
output signalIG switch ON, tire pressure
warning lamp ON8 V or more
IND (T17±6) ±
GND (T17±11)GR±L ± W±BTire pressure warning lamp
output signalIG switch ON, tire pressure
warning lamp OFFBelow 1.5 V
RDA (T17±7) ±
GND (T17±11)V ± W±BTire pressure monitor re-
ceiver input signalIG switch ON, when the
tire pressure monitor re-
ceiver is not connected
10 to 14 V
RF5V (T17±8) ±
GND (T17±11)L ± W±BTire pressure monitor re-
ceiver power sourceIG switch ON4.5 to 5.5 V
CAL SW (T17±10) ±
GND (T17±11)GR ± W±BTire pressure warning re-
set SWIG switch ON
Tire pressure warning re-
set SW OFF
10 to 14 V
CAL SW (T17±10) ±
GND (T17±11)GR ± W±BTire pressure warning re-
set SWIG switch ON
Tire pressure warning re-
set SW ON
Below 1.5 V
GND (T17±11) ±
Body groundW±B ± Body groundGroundAlwaysBelow 1 W
TC (T17±12) ±
GND (T17±11)P±B ± W±BTc terminalWhen terminal TC is not
connected.8 V or more
GND2 (T17±16) ±
GND (T17±11)BR±R ± W±BTire pressure monitor re-
ceiver groundAlwaysBelow 1 W

D13491
DLC3:
BAT
SIL CG
DIDK3±01
F19148
Combination Meter
Tire Pressure
Warning Lamp DI±816
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1010 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSIS SYSTEM
1. CHECK BATTERY VOLTAGE
Battery voltage: 11 to 14 V
If the voltage is below 11 V, recharge the battery before pro-
ceeding.
2. CHECK DLC3
The vehicle's tire pressure monitor ECU uses ISO 9141±2 for
communication. The terminal arrangement of DLC3 complies
with SAE J1962 and matches the ISO 9141±2 format.
Verify the conditions listed in the table below:
Terminal No.Disc.Connection / Voltage or ResistanceCondition
7SILBus + Line / Pulse generationDuring transmission
4CGChassis Ground to Body Ground / 1 W or lessAlways
16BATBattery Positive to Body Ground / 10 to 14 VAlways
HINT:
If the hand±held tester display shows UNABLE TO CONNECT
TO VEHICLE when the cable of the hand±held tester is con-
nected to DLC3, the ignition switch is turned to the ON position
and the tester is operated, there is a problem on the vehicle side
or tester side.

If communication is normal when the tester is connected
to another vehicle, inspect DLC3 on the original vehicle.

If communication is still not possible when the tool is con-
nected to another vehicle, the problem is probably in the
tester itself, so consult the Service Department listed in
the tester's instruction manual.
3. DIAGNOSIS SYSTEM
(a) Warning lamp
(1) The tire pressure warning lamp blinks when there is
any malfunction in the tire pressure warning sys-
tem.
NOTICE:
When the malfunction has been corrected, the tire pres-
sure warning lamp does not come on.
(b) DTCs (Normal mode)
(1) DTCs are memorized in the tire pressure monitor
ECU and read by the blinks of the tire pressure
warning lamp or using the hand±held tester (see
page DI±820.
(c) Test mode
(1) By switching from normal mode into test mode (in-
put signal check), you can inspect the tire pressure
monitor receiver assy, each tire pressure monitor
valve sub±assy and vehicle speed sensor (see
page DI±810).

F19148
Combination Meter
Tire Pressure
Warning Lamp
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±817
1011 Author: Date:
2005 SEQUOIA (RM1146U)
4. CHECK WARNING LAMP
(a) Turn the ignition switch to the ON position.
(b) Check that the tire pressure warning lamp comes on for
3 seconds.
If the warning check result is not normal, proceed to the trouble-
shooting for the tire pressure warning lamp circuit.
Trouble AreaSee page
Tire pressure warning lamp circuitDI±873

Immediately after
turning the IG ON
Always
Comes on
for 3 sec.Goes off Comes onOutput
DTC Blinks
(*1)Blinks
(*2)Blinks
(*3)











 Normal
Low tire pressure
System fail
ECU connector poorly
connected
TC ground
(There is no DTC)
TC ground
(There is DTC)
Test mode
F19135
ON
OFF0.5 sec.
0.5 sec. DI±818
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1012 Author: Date:
2005 SEQUOIA (RM1146U)
5. TIRE PRESSURE WARNING LAMP CHART
HINT:
The table below indicates the state of the tire pressure warning lamp after the ignition switch is turned ON.
*1: Comes on and goes off repeatedly at 0.5 second intervals.