Toyota Tundra. Manual — part 2826
Fig. 74: Identifying A24 ECM Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
B: REPAIR OR REPLACE HARNESS OR CONNECTOR
A: REPLACE ECM (See REMOVAL )
DTC P0894, P2714: TRANSMISSION COMPONENT SLIPPING; PRESSURE CONTROL SOLENOID
"D" PERFORMANCE (SHIFT SOLENOID VALVE SLT)
DESCRIPTION
Fig. 75: Identifying Shift Solenoid Valve SLT
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
The linear solenoid valve (SLT) controls the transmission line pressure for smooth transmission operation based
2009 Toyota Tundra
2009 TRANSMISSION AB60F Automatic Transaxle - Tundra
on signals from the throttle position sensor and vehicle speed sensor. The ECM adjusts the duty ratio* of the
SLT solenoid valve to control the hydraulic line pressure coming from the primary regulator valve. Appropriate
line pressure assures smooth shifting with varying engine outputs.
HINT:
*: The duty ratio is the ratio of the current ON time (A) to the total of the current ON and OFF time (A + B).
Duty Ratio (%) = A/(A + B) x 100
DTC DETECTION CONDITION TABLE
MONITOR DESCRIPTION
The ECM calculates the amount of heat absorbed by the friction material based on the difference in revolution
(clutch slippage) between the turbine and output shaft. The ECM illuminates the MIL and outputs these DTCs
when the amount of heat absorption exceeds the specified value. There are two causes of revolution difference.
DTC
Code
DTC Detection Condition
Trouble Area
P0894
The ECM detects a malfunction of SLT, S1, S2, S3, S4, SL2, gear
6 incorrect ratio (sequence valve) or 1-2 shift solenoid valve
according to the revolution difference of the turbine and the
output shaft, and also by the oil pressure. (2-trip detection logic)
Shift solenoid valve
SLT remains open or
closed
Shift solenoid valve S1,
S2, S3, S4 or SL2
remains open or closed
Gear 6 incorrect ratio
(sequence valve) or 1-2
shift valve is stuck
Valve body is blocked
Automatic transmission
(clutch, brake, gear,
etc.)
P2714
The ECM detects a malfunction of SLT (ON side) according to
the revolution difference of the turbine and the output shaft, and
also by the oil pressure (2 trip detection logic)
Shift solenoid valve
SLT remains open or
closed
Shift solenoid valve S1,
S2, S3, S4 or SL2
remains open or closed
Gear 6 incorrect ratio
(sequence valve) or 1-2
shift valve is stuck
Valve body is blocked
Automatic transmission
(clutch, brake, gear,
etc.)
2009 Toyota Tundra
2009 TRANSMISSION AB60F Automatic Transaxle - Tundra
When the shift solenoid valve SLT remains ON, oil pressure decreases, which causes the clutch
engagement force to decrease.
When the shift solenoid valve remains ON or OFF, the gear position commanded by the ECM and the
actual gear position are not the same.
MONITOR STRATEGY
MONITOR STRATEGY TABLE
TYPICAL ENABLING CONDITIONS
ALL
TYPICAL ENABLING CONDITIONS TABLE
NOTE:
If you continue driving under these conditions, the clutch will burn out and the
vehicle will no longer be drivable.
Related DTCs
P0894: Automatic transmission slip malfunction
P2714: Shift solenoid valve SLT/ON malfunction
Required sensors/Components
Shift solenoid valve SLT
Frequency of operation
Continuous
Duration
P0894 ON malfunction (A): Immediately
P0894 ON malfunction (B): 0.4 sec.
P2714: Immediately
MIL operation
2 driving cycles
Sequence of operation
None
The monitor will run whenever the following DTCs are not
stored
None
Turbine speed sensor circuit
Not circuit malfunction
Output speed sensor circuit
Not circuit malfunction
ATF temperature sensor circuit
Not circuit malfunction
Shift solenoid valve S1 circuit
Not circuit malfunction
Shift solenoid valve S2 circuit
Not circuit malfunction
Shift solenoid valve S3 circuit
Not circuit malfunction
Shift solenoid valve S4 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
Shift solenoid valve SLT 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 position
D
2009 Toyota Tundra
2009 TRANSMISSION AB60F Automatic Transaxle - Tundra
TYPICAL ENABLING CONDITIONS TABLE
TYPICAL MALFUNCTION THRESHOLDS
[P0894: ON malfunction]
When either condition below is met: ON malfunction (A) or (B)
ON malfunction (A)
TYPICAL MALFUNCTION THRESHOLDS TABLE
ON malfunction (B)
TYPICAL MALFUNCTION THRESHOLDS TABLE
[P2714: ON malfunction]
When one of following conditions is met: ON malfunction (A), (B), (C), (D), (E), (F), (G) or (H)
ON malfunction (A)
TYPICAL MALFUNCTION THRESHOLDS TABLE
ON malfunction (B)
TYPICAL MALFUNCTION THRESHOLDS TABLE
Duration time from shifting N to D
4 sec. or more
ECT
40°C (104°F) or higher
Spark advance from max. retard timing by KCS control
0° crankshaft angle or more
Engine
Starting
Transfer position
HIGH*
HINT:
*: 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
Transfer input speed/Transfer output speed
(NO/NOtf)
0.9 or more, and less than 1.1
Summation of C1 clutch heat generations
Specified value
Summation of C2 clutch heat generations
Specified value
Actual gear for SLT failure judgment
Not determined
Summation of C1 clutch heat generations
Specified value
2009 Toyota Tundra
2009 TRANSMISSION AB60F Automatic Transaxle - Tundra
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