Toyota Sequoia (2005). Manual — part 205
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–615
809
TYPICAL ENABLING CONDITIONS
It
Specification
Item
Minimum
Maximum
All:
Turbine speed sensor circuit
Not circuit malfunction
Output speed sensor circuit
Not circuit malfunction
Shift solenoid valve S1 circuit
Not circuit malfunction
Shift solenoid valve S2 circuit
Not circuit malfunction
Shift solenoid valve SR circuit
Not circuit malfunction
Shift solenoid valve SL1 circuit
Not circuit malfunction
Shift solenoid valve SL2 circuit
Not circuit malfunction
ECT (Engine coolant temperature) sensor
circuit
Not circuit malfunction
KCS sensor circuit
Not circuit malfunction
ETCS (Electric throttle control system)
Not system down
Transmission range
”D”
ECT
40
°
C (104
°
F) or more
–
Spark advance from Max. retard timing by
KCS control
0
°
CA or more
–
Engine
Starting
Transfer range
”HIGH”
*1
Transfer range ”HIGH” *1 (This condition is applied only 4WD)
*1 Following conditions met
Vehicle speed sensor circuit
Not circuit malfunction
Output shaft speed sensor circuit
Not circuit malfunction
Transfer output speed
143 rpm or more
–
NO/NOtf (Transfer input speed/Transfer
output speed)
0.9 to 1.1
OFF malfunction (A)
ECM selected gear
1st
Vehicle speed
2 to 40 km/h (1.2 to 24.9 mph)
Throttle valve opening angle
7.0% or more at 2,000 rpm
(Conditions vary with engine speed)
–
OFF malfunction (B)
ECM selected gear
2nd
Vehicle speed
2 km/h (1.2 mph) or more
–
Output speed
2nd
→
1st down shift point or more
–
Throttle valve opening angle
7.0% or more at 2,000 rpm
(Conditions vary with engine speed)
–
OFF malfunction (C)
Current ECM selected gear
5th
Last ECM selected gear
4th
Continuous time for ECM selecting 4th
gear
2 sec. or more
–
Actual gear when ECM selected 4th gear
4th
OFF malfunction (D)
Current ECM selected gear
5th
DI–616
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
810
Last ECM selected gear
4th
ON malfunction (A)
ECM selected gear
1st
Vehicle speed
2 to 40 km/h (1.2 to 24.9 mph)
Throttle valve opening angle
7.0% or more at 2,000 rpm
(Conditions vary with engine speed)
–
ON malfunction (B)
ECM selected gear
4th
Vehicle speed
2 km/h (1.2 mph) or more
–
Throttle valve opening angle
7.0% or more at 2,000 rpm
(Conditions vary with engine speed)
–
ON malfunction (C)
Current ECM selected gear
5th
Last ECM selected gear
4th
Vehicle speed
(During transition from 4th to 5th gear)
–
Less than 100 km/h (62 mph)
ON malfunction (D)
ECM selected gear
5th
Engine speed – Turbine speed (NE – NT)
(After transition from 4th to 5th gear)
–
Less than 150 rpm
Vehicle speed
(After transition from 4th to 5th gear)
–
Less than 100 km/h (62 mph)
TYPICAL MALFUNCTION THRESHOLDS
Detection criteria
Threshold
[OFF malfunction]
All of the following conditions are met: Conditions (A), (B), (C) and (D)
2 detections are necessary per driving cycle
1st detection; temporary flag ON
2nd detection; pending fault code ON
OFF malfunction (A) and (B)
Turbine speed/Output speed
3.30 to 7.50
OFF malfunction (C)
Turbine speed/Output speed
0.65 to 0.79
OFF malfunction (D)
Output record from ECM for 4th
→
5th upshifting
Recorded
[ON malfunction]
Both of the following conditions are met: ON malfunction (A) or (B), and ON malfunction (C) or (D)
ON malfunction (A)
Turbine speed/Output speed
1.91 to 2.35
ON malfunction (B)
Turbine speed/Output speed
1.28 to 1.53
ON malfunction (C)
Turbine speed – Output speed x 4th gear ratio
(NT – NO x 4th gear ratio)
1,000 rpm or more
ECM command gearshift
Shift solenoid valve S2
1st
2nd
3rd
4th
5th
OFF
ON
ON
OFF
OFF
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–617
811
ON malfunction (E)
Turbine speed – Output speed x 5th gear ratio
(NT – NO x 5th gear ratio)
1,000 rpm or more
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 S2 is turned on/off normally when the shift lever is in the D position:
DI–618
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
812
1
Check other DTCs output (in addition to DTC P0756).
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 ”P0756” is output
A
”P0756” and other DTCs
B
HINT:
If any other codes besides ”P0756” are output, perform troubleshooting for those DTCs first.
B
).
A
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