Page 597 of 4323
± DIAGNOSTICSENGINE
DI±395
589 Author: Date:
2005 SEQUOIA (RM1146U)
The ECM must establish a closed throttle valve position learning value to perform fuel cut. If the battery
terminal has been reconnected, the vehicle must be driven over 10 mph (16 km/h) to allow the ECM
to learn the closed throttle valve position.
When the vehicle is driven:
The output voltage of the A/F sensor may be below 0.56 V during fuel enrichment. For the vehicle, this
translates to a sudden increase in speed with the accelerator pedal fully depressed when trying to over-
take another vehicle. The A/F sensor is functioning normally.
The A/F sensor is a current output element; therefore, the current is converted into a voltage inside
the ECM. Measuring the voltage at the connectors of the A/F sensor or ECM will show a constant volt-
age result.
NG Go to step 9.
OK
4 Perform confirmation driving pattern.
NEXT
5 Check whether DTC output recurs (DTC P2195, P2196, P2197 or P2198)
CHECK:
(a) On the hand±held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / PENDING CODES.
(b) Read DTCs.
RESULT:
Display (DTC Output)Proceed To
P2195, P2196, P2197 or P2198A
No outputB
B Go to step 5.
A
Page 780 of 4323
D14218
ECM
R
D
2 3 E78
STAR/NSW
11
E5
E521
E519
E510 J52
J52
J52
J52
J52
J52 J/C
J51
J51
J51
J51
J51
J51B
L±Y
B±Y
W±R
L
LG LGL W±RB±YL±Y
L±R
L±R
B±Y W±L
W BG±R* G±R P
PL
RL
NL
DL
2L
LL IG49
1D 1C
IPOGAUGE
IG1
AM1 74
8
7
1C
1L16AM1
2 1 ALT
BatteryF10
FL BlockCowl Side J/B LHI18
Ignition SW Cowl Side J/B RHTo 4WD Control ECU
To Translate ECU To Starter RelayP1
Park/Neutral Position SW
*: 4WD 21 N
8 54
5
6
1
9
7
3
8AEG GF HA H
C C
F
E
2
RB DI±578
± DIAGNOSTICSAUTOMATIC TRANSMISSION
772 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM
Page 898 of 4323
DIDCF±01
F19439
Crankshaft
Position SensorEngine Room R/B No. 3
Engine Room J/B
Instrument
Panel J/B
STOP Fuse
IGN1 Fuse
ECU±IG Fuse
Stop Light
Switch
Combination Meter
Height Control Switch Body ECU
ECM Engine Room R/B No. 2
Suspension Control ECU
Translate ECU
4LO Switch
2WD/4HI Switch
Height Control Mode Select SwitchIgnition Switch Height Control Indicator Fusible Link Block
AIR SUS Fuse
AM2 Fuse
Height Control Manual IndicatorCenter Diff. Lock Switch
DLC3
Vehicle Speed Sensor
Vehicle Speed Sensor
AIR SUS Relay
AIR SUS No. 2 Fuse DI±696
± DIAGNOSTICSAIR SUSPENSION SYSTEM
890 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION
Page 900 of 4323
DIDCI±01
F19438
Height Control Sensor
Sub±assy
Height Control Mode
Select Switch
Body ECU
Stop Light Switch
Front Door Courtesy
Light Switch (Driver)
Front Door Courtesy
Light Switch
(Passenger)
Rear Door Courtesy
Light Switch (LH)
Rear Door Courtesy
Light Switch (RH)
Back Door Courtesy
Light SwitchCombination Meter
Leveling Solenoid Valve
AIR SUS Relay
DLC3
ECM
Translate ECU Compressor/
Height Control Dryer
Exhaust Solenoid Valve Height Control Valve
Compressor Assy Gate Solenoid Valve IG
BBAT
SBL2
SHRL
SGL2VN
HI
NR
LO
TD
UPSW
DWSW
Door
STPSLRR
SLRL
RC
RM+
RM±
SLEX
SIL
CANH
CANL
CANSuspension
Control ECU Height Control Switch
GND From IG SwitchFrom Battery
From
Battery DI±698
± DIAGNOSTICSAIR SUSPENSION SYSTEM
892 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM
Page 901 of 4323
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±699
893 Author: Date:
2005 SEQUOIA (RM1146U)
Input and output signals of each ECU.
Transmitting ECUReceiving ECUSignalCommunication method
ECM
Translate ECU
Suspension control
ECU
Engine speed signal
Transmission signal
Shift position signal
L4 switch signal
TC signal
CAN
Translate ECUSuspension control
ECUVehicle wheel speed signal
TS signalCAN
Suspension control ECUTranslate ECUAir suspension setting signalCAN
Page 904 of 4323
DI±702
± DIAGNOSTICSAIR SUSPENSION SYSTEM
896 Author: Date:
2005 SEQUOIA (RM1146U)
3. FUNCTION OF MAIN COMPONENTS
ComponentOutline
Height Control Mode Select SwitchUsed to select vehicle height control mode (Auto/Manual).
Used to operate or stop auto leveling control.
Height Control SwitchAuto mode: Used to select vehicle height (HIGH, NORMAL, LOW).
Manual mode: Used to select vehicle height optionally.
Height Control SensorConverts the vertical change of the rear axle, in proportion to the standard, to sig-
nals and detects vehicle height.
Height Control Indicator Lamp (Combination Meter)Auto mode: Target vehicle height is displayed (HIGH, NORMAL, LOW).
Manual mode: Current vehicle height is displayed (HIGH, NORMAL, LOW).
Height Control Manual Indicator Lamp (Combination Meter)
Comes on during manual mode.
Blinks when the suspension control ECU detects a system malfunction.
Blinks during test mode.
Displays output DTC.
Stop light SwitchDetects braking condition.
Used to clear DTCs.
Pneumatic Cylinder (Height Control Cylinder Assy)Supports the vehicle body and adjusts the vehicle height.
Height Control Compressor Assy (Compressor/Height Con-
trol Dryer)The compressor generates compressed air that is necessary to raise vehicle
height and supplies it to the height control cylinder assy.
The dryer removes moisture from the compressed air.
Exhaust Solenoid ValveDrains the air in the height control cylinder assy when vehicle height is lowered.
(Built into the height control compressor assy)
Leveling Solenoid ValveOpens or closes the passage between the height cylinder assy and height control
compressor assy.
Gate Solenoid ValveOpens or closes the passage between the right and left height control cylinder assy
(Built into the leveling solenoid valve).
Suspension Control ECU
Estimates vehicle condition based on the signals from sensors and switches, and
outputs the control signals to the compressor and valves.
Blinks the height control manual indicator light when a system malfunction is de-
tected.
Air Suspension RelaySupplies power to the height control compressor assy.
Door Courtesy Switch (Body ECU)Detects whether the 5 doors, including the back door, are opened or closed, and
sends the signals to the suspension control ECU.
ECMSends the engine speed signal, etc. to the suspension control ECU through CAN
communication.
Speed Sensor (Skid Control ECU)Sends the vehicle wheel speed signal, etc. to the suspension control ECU through
CAN communication via the translate ECU.
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
