Toyota Tundra (2015 year). Manual — part 457
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000W820BYX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: A760F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0766,P0776; Shift Solenoid
"D" Performance (Shift Solenoid Valve S4); 2015 MY Tundra [08/2014 - ]
DTC
P0766
Shift Solenoid "D" Performance (Shift Solenoid Valve S4)
DTC
P0776
Pressure Control Solenoid "B" Performance (Shift Solenoid Valve SL2)
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, 5th or 6th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
CODE
DTC DETECTION CONDITION
TROUBLE AREA
P0766
S4 stuck OFF malfunction or brake control valve
malfunction*:
Shifting to 5th and 6th gears is impossible.
The ECM determines there is a malfunction when the
following conditions are both met (2-trip detection
logic):
(a) When the ECM directs the transmission to switch to 5th
gear, the actual gear is shifted to 4th.
(b) When the ECM directs the transmission to switch to 6th
gear, the actual gear is shifted to 4th.
Shift solenoid valve S4
remains closed
Shift solenoid valve SLT
remains open or closed
Valve body is blocked (brake
control valve)
Automatic transmission
(clutch, brake, gear, etc.)
P0776
SL2 stuck ON malfunction or brake control valve
malfunction*:
Shifting to 5th and 6th gears is impossible.
The ECM determines there is a malfunction when the
following conditions are both met (2-trip detection
logic):
(a) When the ECM directs the transmission to switch to 5th
gear, the actual gear is shifted to 4th.
(b) When the ECM directs the transmission to switch to 6th
gear, the actual gear is shifted to 4th.
Shift solenoid valve SL2
remains closed
Shift solenoid valve SLT
remains open or closed
Valve body is blocked (brake
control valve)
Automatic transmission
(clutch, brake, gear, etc.)
HINT:
1st
2nd
3rd
4th
5th
6th
A760F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISS...
*: Actual gear position under malfunction
1st
2nd
3rd
4th
4th
4th
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
2nd
3rd
3rd
3rd
3rd
MONITOR DESCRIPTION
solenoid valves ON/OFF. When the gear position commanded by the ECM and the actual gear position are not the
same, the ECM illuminates the MIL and stores the DTCs.
MONITOR STRATEGY
Related DTCs
P0766: Shift solenoid valve S4/Functional check
P0776: Shift solenoid valve SL2/Functional check
Required
sensors/Components
Shift solenoid valve S4, Speed sensor (NT), Speed sensor (SP2), Crankshaft
position sensor (NE)
Duration
0.4 seconds
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
A760F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISS...
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
Transfer position
HIGH*
Calculated load value
7.75% or more (A/C off)
7.75% or more (A/C on)
Input speed/output speed (NT/NO)
NT: Input (Turbine) speed
NO: Internal counter shaft speed
3.30 to 7.50
or
1.91 to 2.35
or
1.28 to 1.53
or
0.93 to 1.07
or
0.65 to 0.79
or
0.51 to 0.65
HINT:
*: Following conditions are met
Vehicle speed sensor "A" 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
P0766 OFF Malfunction (A) and P0776 ON Malfunction (A)
ECM selected gear
5th
Vehicle speed
2 km/h (1.2 mph) or more
Throttle valve opening angle
6.6% or more at 2000 rpm
(Conditions vary with engine speed)
P0766 OFF Malfunction (B) and P0776 ON Malfunction (B)
ECM selected gear
6th
Vehicle speed
2 km/h (1.2 mph) or more
Throttle valve opening angle
6.6% or more at 2000 rpm
(Conditions vary with engine speed)
TYPICAL MALFUNCTION THRESHOLDS
A760F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISS...
[OFF malfunction]
Turbine speed / Output speed (NT / NO)
0.93 or more, and 1.07 or less
(This means actual gear is 4th)
P0766 OFF Malfunction (B)
Turbine speed / Output speed (NT / NO)
0.93 or more, and 1.07 or less
(This means actual gear is 4th)
[ON malfunction]
Turbine speed / Output speed (NT / NO)
0.93 or more, and 1.07 or less
(This means actual gear is 4th)
P0776 ON Malfunction (B)
Turbine speed / Output speed (NT / NO)
0.93 or more, and 1.07 or less
(This means actual gear is 4th)
INSPECTION PROCEDURE
NOTICE:
Perform the universal trip to clear permanent DTCs
.
1. ACTIVE TEST
HINT:
Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be
operated without removing any parts. This non-intrusive functional inspection can be very useful because
intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early
in troubleshooting is one way to save diagnostic time. Data List information can be displayed while
performing Active Tests.
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test.
(g) According to the display on the Techstream, perform the Active Test.
HINT:
While driving, the shift position can be forcibly changed with the Techstream.
A760F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISS...
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