Toyota Sequoia (2005). Manual — part 223
D14237
L4
4WD Control ECU:
F23
D14167
ECM:
E8
E7
E6
E5
E4
L4(+)
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–687
881
INSPECTION PROCEDURE
1
Inspect terminal voltage (L4 – body ground).
PREPARATION:
Disconnect the 4WD control ECU connector and turn the igni-
tion switch ON.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Tester Connection
Specified Condition
F23 – 24 (L4) – Body ground
10 to 14 V
NG
Check and replace 4WD control ECU
(See page
OK
2
Inspect terminal voltage (L4 – body ground).
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Tester Connection
Specified Condition
E6 – 13 (L4) – Body ground
10 to 14 V
NG
Replace the ECM (See page
).
OK
Repair or replace the harness or connector
(See page
).
D14232
J12
J/C
A
L–W
ODMS
E4
12
ECM
O3
O/D
Main SW
W–B
IF
3
1
DI–688
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
882
O/D Main Switch Circuit
CIRCUIT DESCRIPTION
The O/D main switch (transmission control switch) is a momentary type switch. When pressing the O/D main
switch once, the O/D OFF indicator light comes on and the ECM prohibits shifting into O/D. When pressing
it once again, the O/D OFF indicator light goes off and the ECM allows shifting into O/D. Turning the IG switch
OFF will reset the O/D OFF indicator light.
WIRING DIAGRAM
DIDJR–01
D14181
Wire Harness Side:
(Connector Front View):
O3
D14182
Switch Side:
(Connector Front View):
O3
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–689
883
INSPECTION PROCEDURE
1
Check harness and connector (O/D main switch – body ground)
PREPARATION:
Disconnect the O/D main switch connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection
Specified Condition
1 – Body ground
Below 1
Ω
NG
Repair or replace the harness or connector
(See page
).
OK
2
Inspect O/D main switch.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Switch Condition
Tester Connection
Specified Condition
O/D main switch pressed
and held
1 – 3
Below 1
Ω
O/D main switch released
↑
10 k
Ω
or higher
NG
Replace O/D main switch (See page
).
OK
D14183
E8
E7
E6
E5
E4
ECM:
ODMS
DI–690
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
884
3
Check harness and connector (O/D main switch – ECM).
PREPARATION:
(a)
Connect the O/D main switch connector.
(b)
Disconnect the connector from the ECM.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Switch Condition
Tester Connection
Specified Condition
O/D main switch pressed
and held
E4 – 12 (ODMS) –
Body ground
Below 1
Ω
O/D main switch released
↑
10 k
Ω
or higher
NG
Repair or replace harness or connector
(See page
).
OK
Proceed to next circuit inspection shown on
matrix chart (See page
).
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