Toyota Sequoia (2005). Manual — part 237
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F16805
S25
Suspension Control ECU
Wire Harness View:
SLRR
F19436
Height Control Valve
Wire Harness View:
H16
3
2 1
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
DI–743
937
3
Check harness and connector (Height control valve – Suspension control ECU,
Body ground).
PREPARATION:
Disconnect the ECU connector.
CHECK:
Check for an open or short circuit in the harness and the con-
nectors between terminal 3 of the height control valve and ter-
minal S25–3 (SLRR) of the suspension control ECU.
OK:
There is no open or short in the wire harness.
CHECK:
Check for an open circuit in the harness and the connectors be-
tween terminal 2 of the height control valve and body ground.
OK:
There is no open in the wire harness.
NG
Repair or replace harness or connector.
OK
Replace suspension control ECU
(See page
).
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F19455
Suspension Control ECU
Exhaust Solenoid Valve
(Height Control Compressor)
L–R
5
BM2
SLEX
1
4
IN1
1
S25
BI
W–B
2
H14
H14
L–R
L–R
DI–744
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
938
DTC
C1735/35 Exhaust Solenoid Valve Circuit
CIRCUIT DESCRIPTION
The suspension control ECU operates the exhaust solenoid valve (height control compressor), releases the
air from the height control cylinder assy (pneumatic cylinder), and lowers vehicle height.
When the vehicle height is lowered, the suspension control ECU opens the height control valve and then
operates the exhaust solenoid valve to release the compressed air to the outside.
The exhaust solenoid valve is on the compressor unit and has only one valve.
DTC No.
DTC Detecting Condition
Trouble Area
C1735/35
Either of the following conditions is detected:
1. With the height control valve inactivated, an open signal of
the height control valve is detected for 1 sec. or more.
2. With the height control valve activated, a short signal of the
valve is detected 8 times successively.
Exhaust solenoid valve (Height control compressor)
Exhaust solenoid valve (Height control compressor) circuit
Suspension control ECU
HINT:
Once the ECU stores DTC C1735/35 in the memory, the vehicle height control is suspended until a
normal signal is input to the ECU from the exhaust solenoid valve. However, control is resumed if the
ignition switch is turned OFF, then ON again.
Malfunction in the exhaust solenoid valve:
The height control indicator lamp ”N” comes on or blinks, and ”HI” and ”LO” do not come on by operating
the height control switch ”UP” or ”DOWN”.
WIRING DIAGRAM
DIDDS–01
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F19457
Connector Front View:
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
DI–745
939
INSPECTION PROCEDURE
HINT:
If DTC C1761/61 (ECU malfunction) and/or C1774/74 (power source circuit) is displayed, perform the
inspection necessary for DTC C1761/61 (See page
) and/or C1774/74 (See page
(If DTC C1761/61 and the C1774/74 are output at the same time, perform the inspection necessary
for DTC C1774/74 first.)
1
Inspect exhaust solenoid valve (height control compressor).
PREPARATION:
Disconnect the valve connector.
CHECK:
Measure the resistance between terminals.
OK:
Solenoid valve
Tester connection
Resistance
Exhaust solenoid valve
1 – 2
10 to 14
Ω
CHECK:
Check the operating sound of the valves when battery voltage
is applied to the terminals as shown below.
Solenoid valve
Battery positive
Battery negative
Exhaust solenoid valve
1
2
OK:
Operating sound (clicking) can be heard.
HINT:
When a malfunction is found in the exhaust solenoid valve, re-
place the height control compressor.
NG
Replace height control compressor assy
(See page
OK
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F16805
S25
Suspension Control ECU
Wire Harness View:
SLEX
F19459
Height Control Compressor
Connector Front View:
H14
DI–746
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
940
2
Check harness and connector (Height control compressor – Suspension control
ECU, Body ground).
PREPARATION:
Disconnect the ECU connector.
CHECK:
Check for an open or short circuit in the harness and the con-
nectors between terminal 1 of the height control compressor
and terminal S25–1 (SLEX) of the suspension control ECU.
OK:
There is no open or short in the wire harness.
CHECK:
Check for an open circuit in the harness and the connectors be-
tween terminal 2 of the height control compressor and body
ground.
OK:
There is no open in the wire harness.
NG
Repair or replace harness or connector.
OK
Replace suspension control ECU
(See page
).
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