Toyota Sequoia (2005). Manual — part 210
D12795
1
2
(–)
(+)
1
2
Shift Solenoid Valve SL2:
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–635
829
3
Check shift solenoid valve SL2.
PREPARATION:
Remove the shift solenoid valve SL2 (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 SL2
(See page
OK
Repair or replace the transmission wire
(See page
).
D14169
1–2 Shift Valve
Valve Body:
DI–636
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
830
DTC
P0781
1–2 Shift (1–2 Shift Valve)
SYSTEM DESCRIPTION
The 1–2 shift valve performs shifting to 1st gear and other
gears.
DTC No.
DTC Detection Condition
Trouble Area
P0781
The gear required by the ECM does not match the actual gear
when driving (2–trip detection logic)
Valve body is blocked up or stuck (1–2 shift valve)
Automatic transmission (clutch, brake or gear, etc.)
MONITOR DESCRIPTION
This DTC indicates that the 1–2 shift valve in the valve body is locked in the direction the spring compresses.
The ECM commands gear shifts by turning the shift solenoid valves ”ON/OFF” and switching oil pressure
to the valves in the valve body.
The ECM calculates the ”actual” transmission gear by comparing the signals from the input speed sensor
(NCO) and the output speed sensor (SP2). The ECM can detect many mechanical problems in the shift sole-
noids, valve body, and the transmission clutches, brakes, and gears. If the ECM detects that the actual gear
position and the commanded gear position are different, it will illuminate the MIL and store the DTC .
MONITOR STRATEGY
Related DTCs
P0781
Valve body/Rationality check
Main
Valve body
Required sensors/Components
Sub
Automatic transmission assembly, Speed sensor (NT), Speed sensor
(NO), Vehicle speed sensor, Throttle speed sensor
Frequency of operation
Continuous
Conditions (A) and (B)
0.4 sec.
Duration
Condition (C)
3 sec.
Duration
Condition (D)
0.5 sec.
MIL operation
2 driving cycles
Sequence of operation
None
DIDJH–01
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–637
831
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
Condition (A)
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)
–
Condition (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)
–
Condition (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 (62.2 mph)
Condition (D)
ECM selected gear
5th
DI–638
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
832
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 (62.2 mph)
TYPICAL MALFUNCTION THRESHOLDS
Detection criteria
Threshold
Both of the following conditions are met: Condition (A), and Condition (B), (C) or (D)
Condition (A)
Turbine speed/Output speed
3.30 to 7.50
Condition (B)
Turbine speed/Output speed
1.28 to 1.53
Condition (C)
Turbine speed – Output speed x 4th gear ratio
(NT – NO x 4th gear ratio)
1,000 rpm or more
Condition (D)
Turbine speed – Output speed x 5th gear ratio
(NT – NO x 5th gear ratio)
1,000 rpm or more
INSPECTION PROCEDURE
1
Check other DTCs output (in addition to DTC P0781).
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 ”P0781” is output
A
”P0781” and other DTCs
B
HINT:
If any other codes besides ”P0781” are output, perform troubleshooting for those DTCs first.
B
).
A
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст