Toyota Sequoia (2005). Manual — part 204
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ECM command gearshift
Shift solenoid valve S1
1st
2nd
3rd
4th
5th
OFF
ON
ON
OFF OFF
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–611
805
INSPECTION PROCEDURE
HINT:
Performing the ACTIVE TEST using the hand–held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method
to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a)
Warm up the engine.
(b)
Turn the ignition switch off.
(c)
Connect the hand–held tester to the DLC3.
(d)
Turn the ignition switch to the ON position.
(e)
Turn on the tester.
(f)
Select the item ”DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST”.
(g)
According to the display on the tester, perform the ”ACTIVE TEST”.
HINT:
While driving, the shift position can be forcibly changed with the hand–held tester.
Comparing the shift position commanded by the ACTIVE TEST with the actual shift position enables you
to confirm the problem (See page
).
Item
Test Details
Diagnostic Note
SHIFT
[Test Details]
Operate the shift solenoid valve and set each shift position by yourself.
[Vehicle Condition]
Less than 50 km/h (31 mph)
[Others]
Press ”
→
” button: Shift up
Press ”
←
” button: Shift down
Possible to check the operation of
the shift solenoid valves.
HINT:
This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
The 4th to 5th up–shiftings must be performed with the accelerator pedal released.
The 5th to 4th down–shiftings must be performed with the accelerator pedal released.
Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.
The shift position commanded by the ECM is shown in the DATA LIST (SHIFT) display on the hand–
held tester.
The shift solenoid valve S1 is turned on/off normally when the shift lever is in the D position:
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DI–612
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
806
1
Check other DTCs output (in addition to DTC P0751).
PREPARATION:
(a)
Turn the ignition switch off.
(b)
Connect the OBD II scan tool or hand–held tester to the DLC3.
(c)
Turn the ignition switch to the ON position.
(d)
Turn on the tester.
(e)
Select the item ”DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES”.
CHECK:
Read the DTCs using the OBD II scan tool or the hand–held tester.
RESULT:
Display (DTC output)
Proceed to
Only ”P0751” is output
A
”P0751” and other DTCs
B
HINT:
If any other codes besides ”P0751” are output, perform troubleshooting for those DTCs first.
B
).
A
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D11991
Shift solenoid S1:
(+)
(–)
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–613
807
2
Check shift solenoid valve S1 operation.
PREPARATION:
Remove the shift solenoid valve S1 (See page
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection
Specified Condition
20
C (68
F)
Solenoid Connector (S1) – Solenoid
Body (S1)
11 to 15
Ω
CHECK:
Connect the positive (+) lead to the terminal of the solenoid con-
nector, and the negative (–) lead to the solenoid body.
OK:
The solenoid makes an operating sound.
NG
Replace shift solenoid valve S1
(See page
OK
3
Inspect valve body
OK:
There are no foreign objects on each valve.
NG
Repair or replace valve body.
OK
Repair or replace transmission (See page
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DI–614
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
808
DTC
P0756
Shift Solenoid ”B” Performance
(Shift Solenoid Valve S2)
SYSTEM DESCRIPTION
The ECM uses signals from the output shaft speed sensor and input speed sensor to detect the actual gear
position (1st, 2nd, 3rd, 4th or 5th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
problems of the shift solenoid valves, valve body or automatic transmission (clutch, brake or gear, etc.).
DTC No.
DTC Detection Condition
Trouble Area
P0756
The gear required by the ECM does not match the actual gear
when driving (2–trip detection logic)
Shift solenoid valve S2 remains open or closed
Valve body is blocked
Automatic transmission (clutch, brake or gear, etc.)
MONITOR
DESCRIPTION
This DTC indicates ”stuck ON malfunction” or ”stuck OFF malfunction” of the shift solenoid valve S2.
The ECM commands gear shifts by turning the shift solenoid valves ”ON/OFF”. When the gear position com-
manded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores
the DTC.
MONITOR STRATEGY
R l t d DTC
P0756
Shift solenoid valve S2/OFF malfunction
Related DTCs
P0756
Shift solenoid valve S2/ON malfunction
Main
Shift solenoid valve S2
Required sensors/Components
Sub
Vehicle speed sensor, Throttle position sensor, Speed sensor (NT), Speed
sensor (NO)
Frequency of operation
Continuous
OFF malfunction (A), (B), (C)
0.4 sec.
OFF malfunction (D)
Immediate
Duration
ON malfunction (A) and (B)
0.4 sec.
Duration
ON malfunction (C)
3 sec.
ON malfunction (D)
0.5 sec.
MIL operation
2 driving cycles
Sequence of operation
None
DIDJD–01
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