Toyota Sequoia (2005). Manual — part 193
DIDJ2–01
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–567
761
FAIL–SAFE CHART
1.
FAIL–SAFE
This function minimizes the loss of the ECT functions when any malfunction occurs in a sensor or solenoid.
Malfunction Part
Function
Output Speed Sensor (SP2)
During an output speed sensor malfunction, shift control is effected through the
input speed sensor signal (NT).
ATF Temp. Sensor No. 1
During an ATF temperature sensor No. 1 malfunction, up–shift to the 5th and flex
lock–up clutch control are prohibited.
Shift Solenoid Valve S1, S2 and SR
The current to the failed solenoid valve is cut off and control is effected by operating
the other solenoid valves with normal operation.
Shift control is effected depending on the failed solenoid as described in the table
on the next page.
Shift Solenoid Valve SL1 and SL2
During a solenoid valve SL1 or SL2 malfunction, up–shift to the 5th is prohibited.
Shift Solenoid Valve SLU
During a solenoid valve SLU malfunction, the current to the solenoid valve is
stopped. This stops lock–up control and flex lock–up control, fuel economy de-
creases.
Shift Solenoid Valve SLT
During a solenoid valve SLT malfunction, the current to the solenoid valve is
stopped. This stops line pressure optimal control, the shift shock increases. How-
ever, shifting is effected through normal clutch pressure control.
Fail Safe Function:
If either of the shift solenoid valve circuits has an open or short failure, the ECM turns the other shift solenoid
”ON” and ”OFF” in order to shift into the gear positions shown in the table below.
In case of a short circuit, the ECM stops sending current to the short circuited solenoid.
Even if starting the engine again in the fail–safe mode, the gear position remains in the same position.
NORMAL
S1 OFF
S2 OFF
SR OFF
”R”
Gear
”D”
”3”
”2”
”L”
S1
S2
Gear
Gear
SR SL1 SL2
Gear
S1
S2 SR SL1 SL2
S1
S2
SR SL1 SL2
S1
S2 SR SL1 SL2
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
R
R
R
R
1 st
1 st
1 st
1 st
1 st
1 st
1 st
1 st
1 st
1 st
1 st E/B
1 st E/B
1 st E/B
1 st E/B
2 nd E/B
3 rd E/B
4 th
5 th
3 rd E/B
3 rd E/B
2 nd E/B
2 nd
4 th
4 th
5 th
5 th
→
2 nd E/B
→
4 th
4 th
4 th
4 th
4 th
4 th
3 rd
3 rd
3 rd
3 rd
4 th
→
5 th
5 th
5 th
4 th
→
3 rd E/B
→
3 rd E/B
3 rd E/B
3 rd E/B
5 th
5 th
2 nd E/B
3 rd E/B
5 th
5 th
4 th
3 rd E/B
3 rd E/B
4 th
1 st E/B
→
2 nd
→
→
5 th
1 st E/B
→
2 nd
Fail 4th
→
3 rd E/B
3 rd E/B
4 th
5 th
3 rd
→→
2 nd
2 nd
2 nd
2 nd
2 nd
2 nd
2 nd
2 nd
2 nd
3 rd E/B
3 rd E/B
→
→
→
→
3 rd
3 rd
3 rd
1 st
1 st
1 st
1 st
3 rd
4 th
4 th
4 th
4 th
Fail 4 th
→
3 rd
4 th
→
Position
DI–568
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
762
: ON
X: OFF
→
: Condition in the electrical malfunction is shown on the left of ”
→
”.
Condition in the fail–safe mode is shown on the right of ”
→
”.
E/B: Engine brake.
S2 SR OFF
S1 SR OFF
S1 S2 SR OFF
Gear
Gear
Gear
”R”
”D”
”3”
”2”
”L”
→
R
R
R
R
1 st
1 st E/B
4 th
5 th
3 rd
2 nd
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
→
1 st
1 st
1 st
1 st
1 st
1 st
1 st
1 st
1 st
2 nd
2 nd
2 nd
3 rd
3 rd
3 rd
3 rd
3 rd
3 rd
3 rd
3 rd
1 st E/B
1 st E/B
1 st E/B
1 st E/B
1 st E/B
1 st E/B
1 st E/B
1 st E/B
1 st E/B
1 st E/B
1 st E/B
1 st E/B
1 st E/B
1 st E/B
1 st E/B
1 st E/B
1 st E/B
4 th
4 th
4 th
4 th
4 th
4 th
4 th
5 th
4 th
4 th
4 th
4 th
4 th
4 th
4 th
3 rd E/B
3 rd E/B
3 rd
1 st
1 st
1 st
1 st
1 st
1 st
2nd
1 st
2nd
2nd
1 st E/B
2nd
1 st
3 rd E/B
3 rd
3 rd
3 rd E/B
3 rd
1 st
3 rd
3 rd E/B
3 rd
1 st
1 st
1 st
1 st
1 st
1 st
1 st
4 th
3 rd
3 rd E/B
3 rd
3 rd E/B
3 rd E/B
4 th
5 th
4 th
5 th
Fail 4 th
Fail 4 th
Fail 4 th
Fail 4 th
→→
→
→
→
→
→
→
→
→
→
→
→→
→
→→
→
→
→
→
→
→
→
→
S1
S2 SR SL1 SL2
S1
S2 SR SL1
S1
S2
SR SL1
S1
S2 SR SL1 SL2
3 rd
SL2
SL2
Gear
S1 S2 OFF
→
→
→
→
→
→
→
→
3 rd
4 th
→
Position
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–569
763
: ON
X: OFF
→
: Condition in the electrical malfunction is shown on the left of ”
→
”.
Condition in the fail–safe mode is shown on the right of ”
→
”.
E/B: Engine brake.
DIDJ3–01
DI–570
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
764
DATA LIST / ACTIVE TEST
1.
DATA LIST
HINT:
According to the DATA LIST displayed by the OBD II scan tool or hand–held tester, you can read the value
of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of
troubleshooting is one method to shorten labor time.
(a)
Warm up the engine.
(b)
Turn the ignition switch off.
(c)
Connect the OBD II scan tool or hand–held tester to the DLC3.
(d)
Turn the ignition switch to the ON position.
(e)
Push the ”ON” button of the OBD II scan tool or the hand–held tester.
(f)
When you use the hand–held tester:
Select the item ”DIAGNOSIS / ENHANCED OBD II / DATA LIST”.
(g)
According to the display on the tester, read the ”DATA LIST”.
Item
Measurement Item/
Range (display)
Normal Condition
Diagnostic Note
STOP LIGHT SW
Stop light SW Status/
ON or OFF
Brake Pedal is depressed: ON
Brake Pedal is released: OFF
–
PNP SW [NSW]
PNP SW Status/
ON or OFF
Shift lever position is;
P and N: ON
Except P and N: OFF
When the shift lever position dis-
played on the hand–held tester dif-
fers from the actual position, ad-
justment of the PNP switch or the
shift cable may be incorrect.
HINT:
When the failure still occurs even
after adjusting these parts,
See page
.
LOW
PNP SW Status/
ON or OFF
Shift lever position is 2: OFF
↓
Shift position L switch Push: ON
↓
Shift position L switch Push: OFF
↑
2ND
PNP SW Status/
ON or OFF
Shift lever position is;
2 and L: ON
Except 2 and L: OFF
↑
3RD
PNP SW Status/
ON or OFF
Shift lever position is;
3: ON
Except 3: OFF
↑
DRIVE
PNP SW Status/
ON or OFF
Shift lever position is;
D: ON
Except D: OFF
↑
REVERSE
PNP SW Status/
ON or OFF
Shift lever position is;
R: ON
Except R: OFF
↑
OVERDRV CUT SW2
O/D SW Status/
ON or OFF
IG SW ON: ON
↓
O/D SW Push: OFF
↓
O/D SW Push: ON
–
SHIFT
Actual Gear Position/
1st, 2nd, 3rd, 4th or 5th
Shift lever position is;
L: 1st
2: 1st or 2nd
3: 1st, 2nd or 3rd
4(O/D OFF): 1st, 2nd, 3rd or 4th
D: 1st, 2nd, 3rd, 4th or 5th
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