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 

DI–789

).

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 

DI–729

) for DTC information.

(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.