2001 TOYOTA SEQUOIA ESP
[x] Cancel search: ESPPage 918 of 4323
DIDCZ±01
DI±716
± DIAGNOSTICSAIR SUSPENSION SYSTEM
910 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
HINT:
If a normal system code is displayed during the DTC check but the problem still occurs, check the cir-
cuits for each problem symptom in the order given in the table below and proceed to the relevant trou-
bleshooting page.
Inspect the fuse before inspecting the suspected areas as shown in the chart below.
Inspect each malfunction circuit in numerical order for the corresponding symptom.
If the malfunction still exists even after checking and confirming that all the circuits are normal, replace
the suspension control ECU.
SymptomSuspected AreaSee page
Vehicle height control function does not operate.
If the compressor remains on for an excessive period of
time or turns on and off repeatedly, the system control will
be halted for up to 70 minutes, after which the system will
return to normal operation.
1. Air tube is seized
2. Power source circuit
3. IG signal circuit
4. Crankshaft position sensor circuit
5. Height control mode select switch circuit
6. Height control switch circuit
7. Height control sensor circuit
8. Leveling solenoid valve circuit
9. Gate solenoid valve circuit
10.Exhaust solenoid valve circuit
11. AIR SUS relay circuit
12.Height control compressor circuit
13.Suspension control ECU
±
DI±761
DI±793
DI±210
DI±778
DI±774
DI±731
DI±740
DI±736
DI±744
DI±747
DI±752
IN±35
Illuminated position of height control indicator lamp does not
change by the height control switch operation.
1. Power source circuit
2. Crankshaft position sensor circuit
3. Height control mode select switch circuit
4. Height control switch circuit
5. Height control sensor circuit
6. Leveling solenoid valve circuit
7. Gate solenoid valve circuit
8. Exhaust solenoid valve circuit
9. AIR SUS relay circuit
10.Height control compressor circuit
11. Speed sensor circuit
12.CAN communication circuit
13.Suspension control ECUDI±763
DI±761
DI±793
DI±210
DI±778
DI±774
DI±731
DI±740
DI±736
DI±744
DI±783
DI±1065
IN±35
Hunting of vehicle height occurs.
1. Air leakage (Height control cylinder assy rear)
2. Height control sensor circuit
3. Suspension control ECUSA±156
DI±731
IN±35
Vehicle height control operates, but vehicle height is uneven.
1. Air leakage
2. Clogging of the air tube
3. Height control sensor link sub±assy
4. Height control sensor circuit
5. Gate solenoid valve circuit
6. Suspension control ECUSA±156
±
SA±156
DI±731
DI±736
IN±35
Vehicle height control operates, but vehicle height is high or
low (Vehicle height in NORMAL mode differs from the standard
value).1. Height control sensor link sub±assy
2. Height control sensor circuit
3. Suspension control ECUSA±156
DI±731
IN±35
When vehicle height control is adjusted, it stops at extremely high
or low position.1. Height control sensor circuit
2. Height control sensor link sub±assy
3. Suspension control ECUDI±731
SA±156
IN±35
Page 919 of 4323
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±717
911 Author: Date:
2005 SEQUOIA (RM1146U) Height control manual indicator lamp condition is abnormal.
1. Power source circuit
2. Height control mode select switch circuit
3. Height control manual indicator lamp circuit
4. Suspension control ECUDI±763
DI±778
DI±789
IN±35
Height control indicator lamp condition is abnormal.
1. Power source circuit
2. Height control indicator lamp circuit
3. Suspension control ECUDI±763
DI±785
IN±35
DTC check cannot be completed.
1. Power source circuit
2. CAN communication system
3. Height control manual indicator lamp circuit
4. Suspension control ECU
5. ECMDI±763
DI±782
DI±789
IN±35
IN±35
Input signal check (test mode) cannot be completed.
1. Power source circuit
2. CAN communication system
3. Suspension control ECU
4. Translate ECUDI±763
DI±783
IN±35
IN±35
Vehicle height is extremely low when vehicle is parked.
Although, especially in a cold district, the vehicle height
may become lower due to a drop in air temperature in the
height control cylinder assy, but this is not abnormal.
1. Air leakage
2. Height control cylinder assy
3. Height control sensor link sub±assy
4. Leveling solenoid valve circuit
5. Exhaust valve circuit
SA±156
±
SA±156
DI±740
DI±744
Compressor motor continues to operate.
Due to the air tube freezing, vehicle height may not rise.
1. Air leakage
2. Air tube clogged
3. Height control cylinder assy
4. Height control sensor link sub±assy
5. Height control sensor circuit
6. Leveling solenoid valve circuit
7. Exhaust valve circuit
8. AIR SUS relay circuit
9. Height control compressor circuit
10.Suspension control ECU
SA±156
±
±
SA±156
DI±731
DI±740
DI±744
DI±747
DI±752
IN±35
Page 931 of 4323
DIDDG±01
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±729
923 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Inspect the fuse before inspecting the suspected areas as shown in the chart below.
If no abnormality is found when the parts are inspected, inspect the suspension control ECU.
If a trouble code is displayed during the DTC check, check the circuit listed for that code. For details
of each code, refer to the ºSee pageº under respective DTC No. in the DTC chart.
DTC No.
(See Page)Detection ItemTrouble Area
Manual
Indicator
Lamp*
1Memory*2
C1714/14
(DI±731)Open or short in left rear height
control sensor circuitHeight control sensor sub±assy
Height control sensor circuit
Suspension control ECU
C1733/33
(DI±736)Open or short in gate solenoid
valve circuitGate solenoid valve (Height control valve)
Gate solenoid valve (Height control valve) circuit
Suspension control ECU
C1734/34
(DI±740)Open or short in leveling sole-
noid valve circuitLeveling solenoid valve (Height control valve)
Leveling solenoid valve (Height control valve) circuit
Suspension control ECU
C1735/35
(DI±744)Open or short in exhaust sole-
noid valve circuitExhaust solenoid valve (Height control compressor)
Exhaust solenoid valve (Height control compressor) circuit
Suspension control ECU
C1741/41
(DI±747)Open or short in AIR SUS relay
circuitAIR SUS relay
AIR SUS relay circuit
Suspension control ECU
C1742/42
(DI±752)Lock, open or short in height
control compressor circuitHeight control compressor assy
Height control compressor circuit
Suspension control ECU
C1751/51*3
(DI±757)
Continuous electric current to
height control compressor circuit
Height control compressor assy
Height control compressor circuit
Height control sensor circuit
Height control sensor sub±assy
Relief valve
AIR SUS relay circuit
Air leakage from the air tube or each valve
Clogging in the air tube or each valve
Suspension control ECU
X
C1761/61
(DI±761)ECU malfunction
Power source circuit
Suspension control ECU
Communication circuit
/ X
C1774/74
(DI±763)Power source drop
Battery
Power source circuit
Suspension control ECU
XX
U0100/65
(DI±782)Lost communication with ECM/
PCMECM
Suspension control ECU
Communication circuit
XX
U0122/67
(DI±783)Lost communication with TL
ECUTranslate ECU
Suspension control ECU
Communication circuit
XX
U0132/71
(DI±784)Lost communication with ride
level control moduleSuspension control ECU
Communication circuitXX
Page 933 of 4323
DIDDK±01
F19441
SHB H15
Height Control Sensor Sub±assy
1 G±OSuspension Control ECU
SBL
BM1G±O 5
IN118
G±O
S2515
SHRL2
GR±L
BM16
IN117
S2517
GR±LGR±L
SHRL
SHG3
L±R
BM17
L±RL±R
IN116
S2519
SGL
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±731
925 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT INSPECTION
DTC C1714/14 Left Rear Height Control Sensor Circuit
CIRCUIT DESCRIPTION
A magnetic circuit installed on the shaft inside the height control sensor rotates around the linear IC. The
linear IC outputs voltage corresponding to the level of magnetic strength generated by the magnetic circuit.
As a result, voltage corresponding to the shaft rotation angle is supplied to the suspension control ECU.
DTC No.DTC Detecting ConditionTrouble Area
C1714/14
Either of the following conditions is detected:
1. With the ignition switch ON, a voltage of the height control
sensor sub±assy is 4.7 V or more or 0.3 V or less for 1 sec.
or more.
2. With the ignition switch ON, a voltage of the height control
sensor sub±assy is 5.5 V or more or 4.3 V or less for 0.5
sec. or more.
Height control sensor sub±assy
Height control sensor circuit
Suspension control ECU
HINT:
Once the ECU stores DTC C1714/14 in the memory, vehicle height control is suspended until a normal
signal is input to the ECU from the height control sensor sub±assy. However, control resumes if the
ignition switch is turned OFF, and then turned ON again.
When the suspension control ECU detects a malfunction in the height control sensor, the height control
indicator lamp ºNº comes on or blinks, and control of the height control sensor ºUPº and ºDOWNº opera-
tion is halted.
WIRING DIAGRAM
Page 1002 of 4323
DIDJW±01
F19887
Tire Pressure Monitor Valve Sub±assy
Tire Pressure
Warning Reset
Switch
Tire Pressure
Monitor ECU
Meter
DLC3
Tire Pressure Monitor Valve Sub±assyTire Pressure Monitor Receiver Assy
DI±800
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
994 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
1. DESCRIPTION OF SYSTEM
(a) A tire pressure monitor valve sub±assy equipped with a tire pressure sensor and a transmitter and is
installed in a tire wheel assy. The sensor measures the tire pressure and the measured value and
transmitter ID are transmitted to the tire pressure monitor receiver assy on the body as radio waves
and then sent to the tire pressure monitor ECU from the tire pressure monitor receiver. If the transmitter
ID has already been registered, the ECU compares the measured air pressure value with the standard
value. When the value is less than the standard value registered in the tire pressure monitor ECU, the
warning lamp on the combination meter comes on.
To address the differences in the air pressure settings by the type of tires, or the differences in
pressure between the front and rear tires, a tire pressure warning reset switch has been newly
adopted.
Along with the adoption of the tire pressure warning reset switch, the warning operation has been
changed.
TPWS transmitters with different bending angles as the tire pressure monitor valve sub±assy
have been provided for steel wheels with center ornaments. (They are not interchangeable with
aluminum wheels or steel wheels with full wheel caps.)
2. WHEN TIRE PRESSURE WARNING LAMP IS LIT
(a) When the warning lamp does not go off, or when it comes on during driving, check tire pressure. If the
warning lamp is lit even though the tire pressure is correctly adjusted, the tire could be punctured.
(b) Under the following conditions, the system may not function properly.
The areas, facilities or devices that use similar radio frequencies are located in the vicinity of the
vehicle.
A radio device of similar frequency is used in the vehicle.
A lot of snow or ice is stuck to the vehicle, especially onto the wheels and around the wheel
houses.
The battery of the sensor has been depleted.
The tires without tire pressure monitor valve sub±assy are used.
Tire chains are used.
Page 1003 of 4323
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±801
995 Author: Date:
2005 SEQUOIA (RM1146U)
When the spare tire is not within the receivable range of the electric wave, a signal may not be
received because spare tires are fixed. Accordingly, the system may not function properly. If
there is a possibility that the TPWS system does not receive a signal from the spare tire, rotate
the tire 90°.
HINT:
If any other wheels than the specified ones are used, the system may not function properly because
the radio waves are differently transmitted from the tire pressure sensor.
Depending on the tire type, the system may not function properly even though the specified wheels
are used.
(c) The average use life of the grommet of the tire pressure monitor valve sub±assy is approximately 5
years, at which time it must be replaced.
(d) After removing and installing the ECU or a sensor, output a diagnosis code and check that it is a normal
code.
3. FUNCTION OF COMPONENTS
ComponentsFunction
Tire pressure monitor valve sub±assy
Combined as a single unit with a disc wheel air valve, it measures tire pressure and
temperature and transmits an ID number for measurement value and identification.
Built±in the battery.
Tire pressure monitor receiver assyReceives and transmits a necessary signal from the transmitter to the tire pressure
monitor ECU.
Tire pressure monitor ECU
Receives the signal from the receiver and identifies it as vehicle's own signal. If the
measurement value is equal to or lower than the specified value, it transmits a sig-
nal so that the air pressure warning lamp on the combination meter comes on.
Tire pressure warning lampLocated in the combination meter, it informs the driver of lowered tire air pressure
and system failure.
Tire pressure warning reset switchEnters the initialization mode for tire or wheel replacement, or tire rotation
4. TIRE PRESSURE WARNING RESET SWITCH
By operating the tire pressure warning reset switch, the tire pressure monitor ECU can be set to issue
a warning at an inflation pressure that corresponds to the type of tires. Therefore, the dealer must set
the warning threshold to the proper value in order to comply with the local regulations.
Operate the tire pressure warning reset switch only after the inflation pressures of all 5 tires (including
the spare) have been adjusted on the vehicle.
To initialize the system, press and hold the tire pressure warning reset switch for 3 seconds or longer
with the ignition switch ON. After the system has been initialized, the warning lamp blinks 3 times (1
second ON, 1 second OFF).
During initialization, the tire pressure monitor valve sub±assy measures the inflation pressure of the
tires, and registers the signals that are transmitted into the tire pressure monitor ECU at a frequency
of one per minute. The initialization process is completed when the signals from the 5 tires have been
received.
The initialization process is canceled if the ignition switch is turned OFF during initialization. To initialize
again, the tire pressure warning reset switch must be pressed again. For this reason, once the tire pres-
sure warning reset switch has been pressed, turning OFF the ignition switch is not recommended for
a minimum of 20 minutes.
Page 1015 of 4323
± 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
Page 1027 of 4323
DIDK6±01
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±825
1019 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
If no abnormality is found when the parts are inspected, inspect the tire pressure monitor ECU.
If a malfunction code is displayed during the DTC check, inspect the circuit listed for that code. For
details of each code, refer to the ºSee pageº under respective ºDTC No.º in the DTC chart.
DTC chart of Tire Pressure Warning:
DTC No.
(See Page)Detection ItemTrouble Area
C2111/11
(DI±827)Transmitter ID1 operation stop
Tire pressure monitor valve sub±assy
Tire pressure monitor receiver assy
Tire pressure monitor ECU
C2112/12
(DI±827)Transmitter ID2 operation stop
Tire pressure monitor valve sub±assy
Tire pressure monitor receiver assy
Tire pressure monitor ECU
C2113/13
(DI±827)Transmitter ID3 operation stop
Tire pressure monitor valve sub±assy
Tire pressure monitor receiver assy
Tire pressure monitor ECU
C2114/14
(DI±827)Transmitter ID4 operation stop
Tire pressure monitor valve sub±assy
Tire pressure monitor receiver assy
Tire pressure monitor ECU
C2115/15
(DI±827)Transmitter ID5 operation stop
Tire pressure monitor valve sub±assy
Tire pressure monitor receiver assy
Tire pressure monitor ECU
C2121/21
(DI±834)Transmitter ID1 not received
Tire pressure monitor valve sub±assy
Tire pressure monitor receiver assy
Tire pressure monitor ECU
Wire harness
C2122/22
(DI±834)Transmitter ID2 not received
Tire pressure monitor valve sub±assy
Tire pressure monitor receiver assy
Tire pressure monitor ECU
Wire harness
C2123/23
(DI±834)Transmitter ID3 not received
Tire pressure monitor valve sub±assy
Tire pressure monitor receiver assy
Tire pressure monitor ECU
Wire harness
C2124/24
(DI±834)Transmitter ID4 not received
Tire pressure monitor valve sub±assy
Tire pressure monitor receiver assy
Tire pressure monitor ECU
Wire harness
C2125/25
(DI±834)Transmitter ID5 not received
Tire pressure monitor valve sub±assy
Tire pressure monitor receiver assy
Tire pressure monitor ECU
Wire harness
C2141/41
(DI±842)Transmitter ID1 error
Tire pressure monitor valve sub±assy
Tire pressure monitor ECU
Tire pressure monitor receiver assy
C2142/42
(DI±842)Transmitter ID2 error
Tire pressure monitor valve sub±assy
Tire pressure monitor ECU
Tire pressure monitor receiver assy
C2143/43
(DI±842)Transmitter ID3 error
Tire pressure monitor valve sub±assy
Tire pressure monitor ECU
Tire pressure monitor receiver assy
C2144/44
(DI±842)Transmitter ID4 error
Tire pressure monitor valve sub±assy
Tire pressure monitor ECU
Tire pressure monitor receiver assy
C2145/45
(DI±842)Transmitter ID5 error
Tire pressure monitor valve sub±assy
Tire pressure monitor ECU
Tire pressure monitor receiver assy