Toyota Sequoia (2005). Manual — part 236
F16805
Suspension Control ECU
Wire Harness View:
S25
SLRL
F19436
Height Control Valve
Wire Harness View:
H16
3 2 1
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
DI–739
933
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 1 of the height control valve and ter-
minal S25–4 (SLRL) 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
).
F19454
Suspension Control ECU
H16
Leveling Solenoid Valve
(Height Control Valve)
LG–R
4
BM1
SLRR
3
13
IN1
3
S25
BI
W–B
2
LG–R
LG–R
DI–740
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
934
DTC
C1734/34 Leveling Solenoid Valve Circuit
CIRCUIT DESCRIPTION
The suspension control ECU opens the leveling solenoid valve (height control valve) to lead the compressed
air to the height control cylinder (pneumatic cylinder) and to raise the vehicle height.
The height control valve consists of a leveling solenoid valve and a gate solenoid valve.
The leveling solenoid valve opens and closes the passage between the compressor and the height control
cylinder (pneumatic cylinder).
DTC No.
DTC Detecting Condition
Trouble Area
C1734/34
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.
Leveling solenoid valve (Height control valve)
Leveling solenoid valve (Height control valve) circuit
Suspension control ECU
HINT:
Once the ECU stores DTC C1734/34 in the memory, the vehicle height control is suspended until a
normal signal is input to the ECU from the height control solenoid valves. However, control is resumed
if the ignition switch is turned OFF, then ON again.
Malfunction in the leveling solenoid valve:
The height control operation is suspended, and the height control indicator lamp does not change by
operating the height control switch.
WIRING DIAGRAM
DIDDR–01
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
DI–741
935
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.)
Start the inspection from step 1 when using the hand–held tester, and start from step 2 when not using
the hand–held tester
1
Perform active test using hand–held tester.
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch ON, and push the hand–held tester main switch ON.
(c)
Select the item ”LEVEL SOL REAR” in the ACTIVE TEST, and operate it with the hand–held tester.
AIR SUSPENSION:
Item
Vehicle Condition / Test Details
Diagnostic Note
LEVEL SOL REAR
Turn leveling solenoid valve / ON or OFF
Operation sound of solenoid (clicking sound) can
be heard
CHECK:
(a)
Check whether the solenoid makes sound.
(b)
Check whether the height control solenoid valve has continuity (will vibrate).
OK:
The solenoid makes sound, and the height control solenoid valve has continuity (will vibrate).
RESULT:
NG
A
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)
B
OK (When troubleshooting according to the DTC chart)
C
B
Proceed to next circuit inspection shown in
problem symptoms table (See page
C
Replace suspension control ECU
(See page
).
A
F19437
Connector Front View:
3 2 1
DI–742
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
936
2
Inspect leveling solenoid valve (height control valve).
PREPARATION:
Disconnect the valve connector.
CHECK:
Measure the resistance between terminals.
OK:
Solenoid valve
Tester connection
Resistance
Leveling solenoid valve
2 – 3
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
Leveling solenoid valve
3
2
OK:
Operating sound (clicking) can be heard.
HINT:
When a malfunction is found in the the leveling solenoid valve,
replace the height control valve.
NG
Replace height control valve
(See page
OK
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст