Toyota Sequoia (2005). Manual — part 233
DIDDE–01
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
DI–727
921
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:
Item
Measurement Item / Range (Dis-
play)
Normal Condition
Diagnostic Note
VEHICLE SPD
Vehicle speed reading / min.: 0
km/h (0 mph), max.: 255 km/h
(158 mph)
Actual vehicle speed
Speed 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 speed
Speed 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 speed
Speed indicated on the speedome-
ter
IG VOLTAGE
ECU power supply voltage / min.:
0 V, max.: 25.5 V
Actual ECU power supply voltage:
10 to 14 V
–
POWER VOLTAGE
+B power source voltage / min.: 0
V, max.: 25.5 V
Actual battery power supply volt-
age: 10 to 14 V
–
STEERING ANG
Steering angle sensor reading /
min.: –49150.5 deg, max.: 49152
deg
Actual steering angle /
Left turn: reading increases
Right turn: reading increases
Zero point is set at the point when
battery is connected
ENGINE SPD
Crankshaft position sensor read-
ing / min.: 0 rpm, max.: 25,500 rpm
Actual engine speed
Speed indicated on the combina-
tion meter
HEIGHT SW DOWN
Height control switch (DOWN) /
ON or OFF
ON: Height control switch
”DOWN” button pressed
OFF: –
–
HEIGHT SW UP
Height control switch (UP) / ON or
OFF
ON: Height control switch ”UP”
button pressed
OFF: –
–
HEIGHT SW HOLD
Height control mode select switch
/ ON or OFF
ON: Height control mode select
switch pressed
OFF: –
–
STOP LIGHT SW
Stop light switch / ON or OFF
ON: Brake pedal depressed
OFF: Brake pedal released
–
DOOR SW
Door courtesy light switch / ON or
OFF
ON: Open each door
OFF: Close all doors
–
L4 SW
4LO switch / ON or OFF
ON: 2WD/4HI switch pressed
OFF: –
–
TS
TS terminal / ON or OFF
ON: During test mode
OFF: Normal mode
–
TC
TC terminal / ON or OFF
ON: DTC recorded
OFF: No DTC recorded
–
SOL SLRL
Height control valve solenoid (Lev-
elling solenoid valve) / ON or OFF
ON: Leveling solenoid operated
OFF: Leveling solenoid not oper-
ated
–
SOL SLRG
Height control valve solenoid
(Gate solenoid valve) / ON or OFF
ON: Gate solenoid operated
OFF: Gate solenoid not operated
–
DI–728
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
922
MAIN RELAY
MAIN relay / ON or OFF
ON: MAIN relay operated
OFF: MAIN relay not operated
–
MOTOR RELAY
AIR SUS relay / ON or OFF
ON: Compressor operated
OFF: Compressor not operated
–
RR HEIGHT
Right rear height control sensor
reading / min.: –3276.7 mm
(–129.004 in.), max.: 3276.8 mm
(129.008 in.)
Always: 0 mm (0 in.)
–
RL HEIGHT
Left rear height control sensor
reading / min.: –3276.7 mm
(–129.004 in.), max.: 3276.8 mm
(129.008 in.)
2WD:
Min.: –15 mm (–0.59 in.)
Max.: 40 mm (1.57 in.)
4WD:
Min.: –30 mm (–1.18 in.)
Max.: 40 mm (1.57 in.)
–
#CODES
Number of DTC recorded / min.: 0,
max.: 255
Min.: 0, Max.: XX
–
2.
ACTIVE TEST LIST
HINT:
Perform the ACTIVE TEST using the hand–held tester to operate the sensors, relays and solenoids without
removing any parts. Performing the ACTIVE TEST is the first step of troubleshooting and is one of the meth-
ods to shorten labor time. It is possible to display the DATA LIST during the ACTIVE TEST.
(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, perform the ACTIVE TEST.
AIR SUSPENSION:
Item
Vehicle Condition / Test Details
Diagnostic Note
RR HEIGHT
Turn height control switch / UP or DOWN
–
LEVEL SOL REAR
Turn leveling solenoid valve / ON or OFF
Operation sound of solenoid (clicking sound) can
be heard
GATE SOL REAR
Turn gate solenoid valve / ON or OFF
Operation sound of solenoid (clicking sound) can
be heard
MOTOR RELAY
Turn AIR SUS relay / ON or OFF
Operation sound of motor can be heard
DIDDG–01
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
DI–729
923
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 ”See page” under respective DTC No. in the DTC chart.
DTC No.
(See Page)
Detection Item
Trouble Area
Manual
Indicator
Lamp*
1
Memory*
2
C1714/14
(
Open or short in left rear height
control sensor circuit
Height control sensor sub–assy
Height control sensor circuit
Suspension control ECU
C1733/33
(
Open or short in gate solenoid
valve circuit
Gate solenoid valve (Height control valve)
Gate solenoid valve (Height control valve) circuit
Suspension control ECU
C1734/34
(
Open or short in leveling sole-
noid valve circuit
Leveling solenoid valve (Height control valve)
Leveling solenoid valve (Height control valve) circuit
Suspension control ECU
C1735/35
(
Open or short in exhaust sole-
noid valve circuit
Exhaust solenoid valve (Height control compressor)
Exhaust solenoid valve (Height control compressor) circuit
Suspension control ECU
C1741/41
(
Open or short in AIR SUS relay
circuit
AIR SUS relay
AIR SUS relay circuit
Suspension control ECU
C1742/42
(
Lock, open or short in height
control compressor circuit
Height control compressor assy
Height control compressor circuit
Suspension control ECU
C1751/51*
3
(
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
(
ECU malfunction
Power source circuit
Suspension control ECU
Communication circuit
/ X
C1774/74
(
Power source drop
Battery
Power source circuit
Suspension control ECU
X
X
U0100/65
(
Lost communication with ECM/
PCM
ECM
Suspension control ECU
Communication circuit
X
X
U0122/67
(
Lost communication with TL
ECU
Translate ECU
Suspension control ECU
Communication circuit
X
X
U0132/71
(
Lost communication with ride
level control module
Suspension control ECU
Communication circuit
X
X
DI–730
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
924
HINT:
*
1
: For codes marked with a ”
” in the ”Manual Indicator Lamp” column, the height control manual indicator
lamp blinks at 1 second intervals.
*
2
: The codes marked with a ”
” in the ”Memory” column are stored in the memory even when the ignition
switch is OFF, but the codes marked with ”X” are not.
*
3
: The relief pressure of the compressed air is 980 kPa (10 kgf/cm
2
, 142 psi). DTC C1751/51 may be output
and vehicle height control may be suspended under the following conditions (not abnormal):
Vehicle height control is attempted on a steep slope when the vehicle is overloaded.
The compressor remains on for an excessive period of time or repeatedly turns on and off because
of continuous height control switch operation.
The vehicle height control function (UP) operates when the vehicle height is set at a position lower than
normal while the engine is running.
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