Toyota Sequoia (2005). Manual — part 232
DIDDA–01
C00083
DLC3
CG
TC
F16800
Height
Control
Manual
Indicator
Lamp
F16801
ON
0.25 sec.
OFF
0.25 sec.
0.5 sec.
1.5 sec.
4.5 sec.
2.5 sec.
0.5 sec.
ON
OFF
Normal:
Codes 13 and 33:
1.5 sec.
Repeat
C00083
DLC3
CG
TC
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
DI–723
917
DTC CHECK / CLEAR
1.
DTC CHECK (USING SST CHECK WIRE)
(a)
Checking DTCs using the SST check wire.
SST
09843–18040
(1)
Using the SST, connect terminals TC and CG of the
DLC3.
(2)
Turn the ignition switch to the ON position.
(3)
Read and record any DTCs from the height control
manual indicator lamp on the combination meter.
As examples, the blinking patterns of a normal sys-
tem code and codes 13 and 33 are shown on the
left.
HINT:
If the height control manual indicator lamp does not show
any DTC or a normal system code, inspect the height con-
trol manual indicator lamp circuit
(See page
The TC terminal circuit uses CAN for communication.
Therefore, if there are any malfunctions in the commu-
nication circuit, one or more DTCs in the CAN commu-
nication system is/are output.
If 2 or more malfunctions are indicated at the same time,
the lowest numbered DTC is displayed first.
(4)
Refer to the Diagnostic Trouble Code Chart (See
page
(5)
After completing the check, remove the SST check
wire from the DLC3.
SST
09843–18040
(b)
Clearing the DTCs using the SST check wire.
SST
09843–18040
(1)
Using SST, connect terminals TC and CG of the
DLC3.
(2)
Turn the ignition switch to the ON position.
BR3890
D05981
Hand–held
Tester
DLC3
DI–724
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
918
(3)
Clear DTCs stored in the ECU by depressing the
brake pedal 8 times or more within 5 seconds.
(4)
Check that the height control manual indicator lamp
shows a normal system code.
(5)
Remove the SST check wire from the DLC3.
SST
09843–18040
HINT:
Disconnecting the battery cable during the operation will not
erase DTCs in the ECU.
2.
DTC CHECK (USING HAND–HELD TESTER)
(a)
Checking DTCs using the hand–held tester.
(1)
Connect the hand–held tester to the DLC3.
(2)
Turn the ignition switch to the ON position.
(3)
Read DTCs by following the prompts on the tester
screen.
HINT:
Refer to the hand–held tester operator’s manual for further de-
tails.
(b)
Clearing the DTCs using the hand–held tester.
(1)
Connect the hand–held tester to the DLC3
(2)
Turn the ignition switch to the ON position.
(3)
Erase the DTCs following the prompts on the tester
screen.
HINT:
Refer to the hand–held tester operator’s manual for further de-
tails.
DIDDC–01
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
DI–725
919
FAIL–SAFE CHART
FAIL–SAFE FUNCTION
When a rear air suspension system malfunction is detected under normal control operation, the suspension
control ECU will suspend the switch control of the height control operation.
FAIL–SAFE CHART
DTC No.
Malfunction Item
Fail–safe Operation
Fail–safe
Deactivation
Condition
C1714/14
Malfunction in height
control sensor
Auto mode:
When the target vehicle height, just before fail, is higher than
”N”, vehicle height is lowered for 20 seconds and then sys-
tem control shuts down.
Manual mode:
When the target vehicle height, just before switching to the
manual mode, is higher than ”N”, the switch operation to
lower vehicle height is available for only 20 seconds.
Return to normal condition.
C1733/33
Open or short in gate
solenoid valve
System control shuts down.
Return to normal condition.
C1734/34
Open or short in level-
ing solenoid valve
System control shuts down.
Return to normal condition.
C1735/35
Open or short in ex-
haust solenoid valve
Auto mode:
After vehicle height is raised through control, the system
shuts down.
Manual mode:
When vehicle height is lower than ”N”, only the switch opera-
tion to raise vehicle height is available.
Return to normal condition.
C1741/41
Open or short in AIR
SUS relay circuit
Auto mode:
After vehicle height is lowered through control, the system
shuts down.
Manual mode:
When vehicle height is higher than ”N”, only the switch op-
eration to lower vehicle height is available.
Return to normal condition.
C1742/42
Lock in height control
compressor motor
Auto mode:
After vehicle height is lowered through control, the system
shuts down.
Manual mode:
When vehicle height is higher than ”N”, only the switch op-
eration to lower vehicle height is available.
After interrupting for 70 min-
utes, restart the control.
C1751/51
Powered continuously
or powered excessive-
ly in height control
compressor motor
Auto mode:
After vehicle height is lowered through control, the system
shuts down.
Manual mode:
When vehicle height is higher than ”N”, only the switch op-
eration to lower vehicle height is available.
After interrupting for 70 min-
utes, restart the control.
C1761/61
Malfunction in suspen-
sion control ECU
System control shuts down.
Return to normal condition.
C1774/74
Power voltage
dropped
System control shuts down.
Return to normal condition.
U0100/65
Lost communication
with TL ECU
System control continues.
Return to normal condition.
DI–726
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
920
U0122/67
Lost communication
with ECM/PCM
System control continues.
Return to normal condition.
U0132/71
Lost communication
with ride level control
module
System control continues.
Return to normal condition.
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