Toyota Sequoia (2005). Manual — part 249
I27705
Combination Meter Wire Harness View:
C6
C6–13
F16805
Suspension Control ECU
Wire Harness View:
S25
VN
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
DI–791
985
2
Check harness and connector (Suspension control ECU – Combination meter
assy).
PREPARATION:
Disconnect the suspension control ECU connector and the
combination meter connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connection
(Symbol)
Condition
Specified condition
S25–11 (VN) – C6–13
Always
Below 1
Ω
S25–11 (VN) –
Body ground
Always
10 k
Ω
or higher
NG
Repair or replace harness or connector.
OK
F16805
Suspension Control ECU
Wire Harness View:
S25
VN
DI–792
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
986
3
Check combination meter.
PREPARATION:
Reconnect the combination meter connector.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Tester connection
(Symbol)
Condition
Specified condition
S25–11 (VN) –
Body ground
Ignition switch ON
10 to 14 V
NG
Replace combination meter
(See page
).
OK
Replace suspension control ECU
(See page
).
F19452
Sub J/B No. 3
Suspension Control
ECU
Instrument Panel J/B
I18
Ignition SW
F10
FL Block
W–L
2
B
Battery
IG1
AM1
1
J37
A
J37
A
J/C
B–R
S25
10
IG
ALT
5
8
W
1L
1
AM1
1
1C
6
1C
4
ECU–IG
1F
4
B–R
8
3A
3C
8
2
B–Y
B–R
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
DI–793
987
IG Signal Circuit
CIRCUIT DESCRIPTION
The suspension control ECU, controlling the air suspension system, is activated when the ignition switch
is turned ON.
The main relay inside the ECU is activated after 2 seconds and the system is operated by +B power source.
WIRING DIAGRAM
DIDEO–01
DI–794
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
988
INSPECTION PROCEDURE
HINT:
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
Read value of the 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 ”IG VOLTAGE” in the DATA LIST, and read its value displayed on the hand–held tester.
AIR SUSPENSION:
Item
Measurement Item / Range (Dis-
play)
Normal Condition
Diagnostic Note
IG VOLTAGE
ECU power supply voltage / min.:
0 V, max.: 25.5 V
Actual ECU power supply voltage:
10 to 14 V
–
CHECK:
Check the ECU supply voltage.
OK:
Actual ECU power supply voltage: 10 to 14 V
OK
Proceed to next circuit inspection shown in
problem symptoms table (See page
NG
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