Toyota Tundra (2015 year). Manual — part 351
OK
1.
INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL2)
(a) Disconnect the D83 transmission wire connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
15 (SL2+) - 4 (SL2-)
20°C (68°F)
5.0 to 5.6 Ω
15 (SL2+) - Body ground
Always
10 kΩ or higher
4 (SL2-) - Body ground
Always
10 kΩ or higher
Text in Illustration
*a
Component without harness connected
(Transmission Wire)
NG
GO TO STEP 3
2.
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
(a) Disconnect the D74 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
A760E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
D74-12 (SL2+) - D74-13 (SL2-)
20°C (68°F)
5.0 to 5.6 Ω
D74-12 (SL2+) - Body ground
Always
10 kΩ or higher
D74-13 (SL2-) - Body ground
Always
10 kΩ or higher
Text in Illustration
*a
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM
3.
INSPECT SHIFT SOLENOID VALVE SL2
NG
REPLACE SHIFT SOLENOID VALVE SL2
OK
REPAIR OR REPLACE TRANSMISSION WIRE
A760E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000XP10BIX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: A760E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0781; 1-2 Shift (1-2 Shift
Valve); 2015 MY Tundra [08/2014 - ]
DTC
P0781
1-2 Shift (1-2 Shift Valve)
DESCRIPTION
The 1-2 shift valve performs shifting to 1st gear and other gears. When shifting to 2nd and 4th gears is
impossible, or when the ECM directs the transmission to switch to 5th or 6th gear and the engine overruns
(clutch slips), this DTC is stored.
DTC
CODE
DTC DETECTION CONDITION
TROUBLE AREA
P0781
Conditions (a) and (b), or (a) and (c) are met (2-trip
detection logic):
(a) When the ECM directs the transmission to switch to
2nd gear, the actual gear is shifted to 1st.
(b) When the ECM directs the transmission to switch to
4th gear, the actual gear is shifted to 3rd.
(c) When the ECM directs the transmission to switch to 5th
gear, the engine overruns (clutch slips).
Valve body is blocked or stuck
(1-2 shift valve)
Shift solenoid valve SLT
remains open or closed
Automatic transmission (clutch,
brake, gear, etc.)
HINT:
1st
2nd
3rd
4th
5th
6th
Actual gear position under malfunction
1st
1st
3rd
3rd
N*
N*
N*: Neutral
Gear position during fail-safe operation:
If any malfunction is detected, the ECM changes into the fail-safe mode to shift into the gear
positions as shown in the table below.
Gear position under normal conditions
1st
2nd
3rd
4th
5th
6th
Actual gear position under fail-safe mode
1st*
1st*
3rd
3rd
3rd
3rd
HINT:
1st*: Under engine braking, downshifting to 1st or 2nd gear is prohibited.
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.
A760E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...
The ECM calculates the "actual" transmission gear by comparing the signals from the input speed sensor (NT) and
the output speed sensor (SP2). The ECM can detect many mechanical problems in the shift solenoids, valve body,
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 / Functional check
Required sensors/Components
Valve body, Automatic transmission assembly
Duration
Condition (A) and (B)
0.4 seconds
Condition (C)
3 seconds
Condition (D)
1 second
MIL operation
2 driving cycles
TYPICAL ENABLING CONDITIONS
All
The monitor will run whenever the following DTCs
are not present
P0717 (Turbine speed sensor circuit)
P0500 (Output speed sensor circuit)
P0327, P0328, P032C, P032D, P0332, P0333, P033C, P033D
(KCS sensor circuit)
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
ECT (Engine Coolant Temperature) sensor circuit
Not circuit malfunction
ETCS (Electric Throttle Control System)
Not system down
Transmission position
"D"
Duration time from shifting "N" to "D"
4 seconds 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
A760E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...
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