2001 TOYOTA SEQUOIA Service Repair Manual

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Page 929 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DIDDE±01
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±727
921 Author: Date:
2005 SEQUOIA (RM1146U)
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
By accessing the DATA LIST displayed by the hand±held tes

DIDDE±01
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±727
921 Author: Date:
2005 SEQUOIA (RM1146U)
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
By accessing the DATA LIST displayed by the hand±held tester, you can read the value of the switches and
sensors and so on without removing any parts. Reading the DATA LIST is the first step of troubleshooting
and is one method to shorten labor time.
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Following the display on the tester, read the DATA LIST.
AIR SUSPENSION:
ItemMeasurement Item / Range (Dis-
play)Normal ConditionDiagnostic Note
VEHICLE SPD
Vehicle speed reading / min.: 0
km/h (0 mph), max.: 255 km/h
(158 mph)
Actual vehicle speedSpeed indicated on the combina-
tion meter
FR WHEEL SPD
Wheel speed (Front right) reading /
min.: 0 km/h (0 mph), max.: 255
km/h (159 mph)
Actual vehicle speedSpeed indicated on the speedome-
ter
FL WHEEL SPD
Wheel speed (Front left) reading /
min.: 0 km/h (0 mph), max.: 255
km/h (159 mph)
Actual vehicle speedSpeed indicated on the speedome-
ter
IG VOLTAGEECU power supply voltage / min.:
0 V, max.: 25.5 VActual ECU power supply voltage:
10 to 14 V±
POWER VOLTAGE+B power source voltage / min.: 0
V, max.: 25.5 VActual battery power supply volt-
age: 10 to 14 V±
STEERING ANG
Steering angle sensor reading /
min.: ±49150.5 deg, max.: 49152
degActual steering angle /
Left turn: reading increases
Right turn: reading increasesZero point is set at the point when
battery is connected
ENGINE SPDCrankshaft position sensor read-
ing / min.: 0 rpm, max.: 25,500 rpmActual engine speedSpeed indicated on the combina-
tion meter
HEIGHT SW DOWNHeight control switch (DOWN) /
ON or OFFON: Height control switch
ºDOWNº button pressed
OFF: ±
±
HEIGHT SW UPHeight control switch (UP) / ON or
OFFON: Height control switch ºUPº
button pressed
OFF: ±
±
HEIGHT SW HOLDHeight control mode select switch
/ ON or OFFON: Height control mode select
switch pressed
OFF: ±
±
STOP LIGHT SWStop light switch / ON or OFFON: Brake pedal depressed
OFF: Brake pedal released±
DOOR SWDoor courtesy light switch / ON or
OFFON: Open each door
OFF: Close all doors±
L4 SW4LO switch / ON or OFFON: 2WD/4HI switch pressed
OFF: ±±
TSTS terminal / ON or OFFON: During test mode
OFF: Normal mode±
TCTC terminal / ON or OFFON: DTC recorded
OFF: No DTC recorded±
SOL SLRLHeight control valve solenoid (Lev-
elling solenoid valve) / ON or OFFON: Leveling solenoid operated
OFF: Leveling solenoid not oper-
ated
±
SOL SLRGHeight control valve solenoid
(Gate solenoid valve) / ON or OFFON: Gate solenoid operated
OFF: Gate solenoid not operated±

Page 930 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±728
± DIAGNOSTICSAIR SUSPENSION SYSTEM
922 Author: Date:
2005 SEQUOIA (RM1146U) MAIN RELAY
MAIN relay / ON or OFFON: MAIN relay operated
OFF: MAIN relay not operated±
MOTOR RELAYAIR SUS rela

Page 931 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual 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

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 932 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±730
± DIAGNOSTICSAIR SUSPENSION SYSTEM
924 Author: Date:
2005 SEQUOIA (RM1146U)
HINT:
*
1: For codes marked with a ºº in the ºManual Indicator Lampº column, the height control manual ind

Page 933 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual 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
SG

Page 934 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±732
± DIAGNOSTICSAIR SUSPENSION SYSTEM
926 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Proceed to troubleshooting following the flow chart, regardless of whether or not

Page 935 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual F19456
Wire Harness Connector
Front View:
H15
SHB
SHG
F16805
S25
Suspension Control ECU
Wire Harness View:
SGL
SBL
F19456
Height Control Sensor Sub±assy
Connector Front View:
SHG H15
SHB
± DIAGNO

Page 936 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual F16805
S25
Suspension Control ECU
Wire Harness View:
SHRL
F19456
Height Control Sensor Sub±assy
Connector Front View:
H15
SHRL
DI±734
± DIAGNOSTICSAIR SUSPENSION SYSTEM
928 Author: Date:
2005

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