Toyota Sequoia (2005). Manual — part 206
D11992
Shift solenoid S2:
(+)
(–)
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–619
813
2
Inspect shift solenoid valve S2 operation.
PREPARATION:
Remove the shift solenoid valve S2 (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 (S2) – Solenoid
Body (S2)
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 S2
(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
DI–620
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
814
DTC
P0771
Shift Solenoid ”E” Performance
(Shift Solenoid Valve SR)
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
P0771
The gear required by the ECM does not match the actual gear
when driving (2–trip detection logic)
Shift solenoid valve SR remains open or closed
Shift solenoid valve SL1 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 SR or SL1.
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
Related DTCs
P0771
Shift solenoid valve SR/Rationality check
R
i d
/C
t
Main
Shift solenoid valve SR
Required sensors/Components
Sub
Speed sensor (NT), Speed sensor (NO), Crankshaft position sensor (NE)
Frequency of operation
Continuous
OFF malfunction (A)
0.4 sec.
Duration
OFF malfunction (B) and (C)
Immediate
Duration
ON malfunction
0.15 sec.
MIL operation
2 driving cycles
Sequence of operation
None
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
DIDJE–01
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–621
815
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
5th
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)
–
OFF malfunction (B)
Current ECM selected gear
5th
Last ECM selected gear
4th
Continuous time for ECM selecting 4th
gear
2 sec. or more
–
OFF malfunction (C)
Current ECM selected gear
5th
Last ECM selected gear
4th
ON malfunction
Current ECM selected gear
2th
Last ECM selected gear
1st
Throttle valve opening angle
(During transition from 1st to 2nd gear)
6.0% or more at 3,000 rpm
(Conditions vary with engine speed)
–
TYPICAL MALFUNCTION THRESHOLDS
Detection criteria
Threshold
[OFF malfunction]
All of the following conditions are met: OFF malfunctions (A), (B) and (C)
2 detections are necessary per driving cycle
1st detection; temporary flag ON
2nd detection; temporary pending fault code ON
OFF malfunction (A)
Turbine speed/Output speed
0.93 to 1.07
OFF malfunction (B)
Turbine speed/Output speed
Not change as follow
0.93 to 1.07
↓
0.65 to 0.79
ECM command gearshift
Shift solenoid valve SR
1st
2nd
3rd
4th
5th
OFF
OFF
OFF
Shift solenoid valve SL1
OFF
OFF
OFF
ON
ON
OFF
OFF
DI–622
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
816
OFF malfunction (C)
Output record from ECM for 4th
→
5th upshifting
Recorded
[ON malfunction]
2 detections are necessary per driving cycle
1st detection; temporary flag ON
2nd detection; temporary pending fault code ON
Turbine speed – Output speed x 1st gear ratio
(NT – NO x 1st gear ratio)
150 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 SR and SL1 is turned on/off normally when the shift lever is in the D position:
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст