Toyota Sequoia (2005). Manual — part 203
D12795
1
2
(–)
(+)
1
2
Shift Solenoid Valve SL1:
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–607
801
3
Inspect shift solenoid valve SL1.
PREPARATION:
Remove the shift solenoid valve SL1 (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 SL1
(See page
OK
Repair or replace the transmission wire
(See page
).
DI–608
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
802
DTC
P0751
Shift Solenoid ”A” Performance
(Shift Solenoid Valve S1)
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
P0751
The gear required by the ECM does not match the actual gear
when driving (2–trip detection logic)
Shift solenoid valve S1 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 S1.
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
R l t d DTC
P0751
Shift solenoid valve S1/OFF malfunction
Related DTCs
P0751
Shift solenoid valve S1/ON malfunction
Main
Shift solenoid valve S1
Required sensors/Components
Sub
Vehicle speed sensor, Throttle position sensor, Speed sensor (NT), Speed
sensor (NO)
Frequency of operation
Continuous
OFF malfunction (A) and (B)
0.4 sec.
OFF malfunction (C)
Immediate
Duration
ON malfunction (A), (B) and
(C)
0.4 sec.
ON malfunction (D)
3 sec.
ON malfunction (E)
0.5 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
DIDJC–01
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI–609
803
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
8% or more
and 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
–
Actual gear when ECM selected 4th gear
4th
OFF malfunction (C)
Current ECM selected gear
5th
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)
ECM selected gear
3rd
Vehicle speed
2 km/h (1.2 mph) or more
–
DI–610
–
DIAGNOSTICS
AUTOMATIC TRANSMISSION
804
Throttle valve opening angle
7.0% or more at 2,000 rpm
(Conditions vary with engine speed)
–
ON malfunction (D)
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)
ON malfunction (E)
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 (62.2 mph)
TYPICAL MALFUNCTION THRESHOLDS
Detection criteria
Threshold
[OFF malfunction]
All of the following conditions are met: Conditions (A), (B) and (C)
2 detections are necessary per driving cycle
1st detection; temporary flag ON
2nd detection; pending fault code ON
OFF malfunction (A)
Turbine speed/Output speed
0.93 to 1.07
OFF malfunction (B)
Turbine speed/Output speed
0.65 to 0.79
OFF malfunction (C)
Output record from ECM for 4th
→
5th upshifting
Recorded
[ON malfunction]
Either of the following conditions is met:
ON malfunction (A) and (B)
ON malfunction (B) or (C), and ON malfunction (D) or (E)
ON malfunction (A) and (B)
Turbine speed/Output speed
3.30 to 7.50
ON malfunction (C)
Turbine speed/Output speed
1.91 to 2.35
ON malfunction (D)
Turbine speed – Output speed x 4th gear ratio
(NT – NO x 4th gear ratio)
1,000 rpm or more
ON malfunction (E)
Turbine speed – Output speed x 5th gear ratio
(NT – NO x 5th gear ratio)
1,000 rpm or more
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