Toyota Sequoia (2005). Manual — part 219
D14161
E8
E7
E6
E5
E4
ECM:
THO2
E2
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–671
865
2
Check harness and connector (Transmission wire – ECM)
PREPARATION:
(a)
Connect the transmission wire connector.
(b)
Disconnect the connector of the ECM.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection
Specified Condition
E7 – 32 (THO2) – E8 – 28 (E2)
25
Ω
to 156 k
Ω
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection
Specified Condition
E7 – 32 (THO2) – Body ground
10 k
Ω
or higher
E8 – 28 (E2) – Body ground
↑
NG
Repair or replace the harness or connector
(See page
).
OK
Replace the ECM (See page
D14175
G23415
D14176
Lock–up
Operation
Pressure
Current Flow to Solenoid
DI–672
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
866
DTC
P2757
Torque Converter Clutch Pressure Control Solenoid
Performance(Shift Solenoid Valve SLU)
SYSTEM DESCRIPTION
The ECM uses the signals from the throttle position sensor, Air–
flow meter, turbine (input) speed sensor, output speed sensor
and crankshaft position sensor to monitor the engagement
condition of the lock–up clutch.
Then the ECM compares the engagement condition of the
lock–up clutch with the lock–up schedule in the ECM memory
to detect a mechanical problems of the shift solenoid valve
SLU, valve body and torque converter clutch.
DTC No.
DTC Detection Condition
Trouble Area
P2757
Lock–up does not occur when driving in the lock–up range
(normal driving at 80 km/h
[
50 mph
]
), or lock–up remains ON
in the lock–up OFF range.
(2–trip detection logic)
Shift solenoid valve SLU remains open or closed
Valve body is blocked
Torque converter clutch
Automatic transmission (clutch, brake or gear, etc.)
Line pressure is too low
DIDJO–01
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–673
867
MONITOR DESCRIPTION
Torque converter lock–up is controlled by the ECM based on the turbine (input) speed sensor NT, output
speed sensor SP2, engine rpm, engine load, engine temperature, vehicle speed, transmission temperature,
and gear selection. The ECM determines the lock–up status of the torque converter by comparing the engine
rpm (NE) to the input turbine rpm (NT). The ECM calculates the actual transmission gear by comparing input
turbine rpm (NT) to output shaft rpm (SP2). When conditions are appropriate, the ECM requests ”lock–up”
by applying control voltage to the shift solenoid SLU. When the SLU is turned on, it applies pressure to the
lock–up relay valve and locks the torque converter clutch.
If the ECM detects no lock–up after lock–up has been requested or if it detects lock–up when it is not re-
quested, the ECM interprets this as a fault in the shift solenoid valve SLU or lock–up system performance.
The ECM will turn on the MIL and store the DTC.
Example:
When any of the following is met, the system judges it as a malfunction.
(a)
There is a difference in rotation between the input side (engine speed) and output side (input turbine
speed) of the torque converter when the ECM commands lock–up.
(Engine speed is at least 70 rpm greater than input turbine speed.)
(b)
There is no difference in rotation between the input side (engine speed) and output side (input turbine
speed) of the torque converter when the ECM commands lock–up off.
(The difference between engine speed and input turbine speed is less than 35 rpm.)
MONITOR STRATEGY
R l t d DTC
P2757
Shift solenoid valve SLU/OFF malfunction
Related DTCs
P2757
Shift solenoid valve SLU/ON malfunction
Main
Shift solenoid valve SLU
Required sensors/Components
Sub
Valve body, Vehicle speed sensor, Throttle position sensor, Speed sensor
(NT), Speed sensor (NO)
Frequency of operation
Continuous
OFF malfunction (A)
2 sec.
Duration
OFF malfunction (B)
0.4 sec.
Duration
ON malfunction
1.8 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
Torque converter clutch pressure control
solenoid circuit
Not circuit malfunction
KCS sensor circuit
Not circuit malfunction
ETCS (Electric throttle control system)
Not system down
Transmission range
”D”
DI–674
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
868
ECT (Engine coolant temperature)
40
°
C (104
°
F) or more
–
Spark advance from Max. retard timing by
KCS control
0
°
CA or more
–
Engine
Starting
ECM selected gear
4th or 5th
Vehicle speed
25 km/h (15.5 mph) or more
–
Shift solenoid valve S1 circuit
Not on malfunction
Shift solenoid valve S2 circuit
Not on malfunction
Shift solenoid valve SL2 circuit
Not on malfunction
1–2 Shift valve
Not on malfunction
Transfer neutral position switch
OFF
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 lock–up command
ON
(SLU pressure: 513kpa or more)
Vehicle speed
–
Less than 100 km/h (62.2 mph)
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)
–
ON malfunction
ECM lock–up command
OFF
(SLU pressure: less than 4kpa)
Throttle valve opening angle
9% or more
–
Vehicle speed
–
Less than 60 km/h (37.3 mph)
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