Toyota Sequoia (2005). Manual — part 220
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DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–675
869
TYPICAL MALFUNCTION THRESHOLDS
Detection criteria
Threshold
Both of the following conditions are met: OFF malfunctions (A) and (B)
OFF malfunction (A)
Engine speed – Turbine speed
70 rpm or more
OFF malfunction (B)
Turbine speed/Output speed
Not
3.30 to 7.50
ON malfunction
2 detections are necessary per driving cycle
1st detection; temporary flag ON
2nd detection; pending fault code ON
Vehicle speed must be under 10 km/h (6.2 mph) once before 2nd detection
Difference between engine speed and turbine speed
Less then 35 rpm
G23400
G23400
D14177
Accelerator Pedal
Opening Angle
Lock–up OFF
Lock–up ON
→
time
Engine Speed
Accelerator Pedal
Fully Released
DI–676
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DIAGNOSTICS
AUTOMATIC TRANSMISSION
870
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”.
Item
Test Details
Diagnostic Note
LOCK UP
[Test Details]
Control the shift solenoid SLU to set the automatic transmission to the
lock–up condition.
[Vehicle Condition]
Throttle valve opening angle: Less than 35 %
Vehicle Speed: 60 km/h (37 mph) or more
Possible to check the SLU opera-
tion.
HINT:
This test can be conducted when the vehicle speed is 60 km/h (37 mph) or more.
This test can be conducted in the 5th gear.
Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.
HINT:
When changing the accelerator pedal opening angle while driving, if the engine speed does not
change, lock–up is on.
Slowly release, but not fully, the accelerator pedal in order to decelerate. (Fully releasing the pedal will
close the throttle valve and lock–up may be turned off automatically.)
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–677
871
1
Check other DTCs output (in addition to DTC P2757).
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 ”P2757” is output
A
”P2757” and other DTCs
B
HINT:
If any other codes besides ”P2757” are output, perform troubleshooting for those DTCs first.
B
).
A
D12795
1
2
(–)
(+)
1
2
Shift Solenoid Valve SLU:
DI–678
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
872
2
Check shift solenoid valve SLU operation.
PREPARATION:
Remove the shift solenoid valve SLU (See page
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection
Specified Condition
20
C (68
F)
1 – 2
5.0 to 5.6
Ω
CHECK:
Connect the positive (+) lead with a 21 W bulb to terminal 2 and
the negative (–) lead to terminal 1 of the solenoid valve connec-
tor, then check the movement of the valve.
OK:
The solenoid makes an operating sound.
NG
Replace the shift solenoid valve SLU
(See page
OK
3
Inspect valve body
OK:
There are no foreign objects on each valve.
NG
Repair or replace valve body.
OK
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