Toyota Tundra. Manual — part 2819

NG: REPLACE SHIFT SOLENOID VALVE S3 (See DISASSEMBLY )

OK: Go to next step.

4. INSPECT TRANSMISSION VALVE BODY ASSEMBLY

a. Check the transmission valve body assembly (see REMOVAL ).

OK: There are no foreign objects on any valve.

NG: REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY (See REMOVAL )

OK: REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY (See REMOVAL )

DTC P0766, P0776: SHIFT SOLENOID "D" PERFORMANCE (SHIFT SOLENOID VALVE S4);
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
problems of the shift solenoid valves, valve body or automatic transmission (clutch, brake, gear, etc.).

DTC DETECTION CONDITION TABLE

DTC

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 open



Shift solenoid valve SLT
remains open or closed



Valve body is blocked
(brake control valve)



Automatic transmission
(clutch, brake, gear, etc.)

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

HINT:



Gear positions in the event of a solenoid valve mechanical problem:

GEAR SHIFT POSITIONS TABLE



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 SHIFT POSITIONS TABLE

MONITOR DESCRIPTION

This DTC indicates "stuck OFF malfunction" of the shift solenoid valve S4, "stuck ON malfunction" of the shift
solenoid valve SL2, or brake control valve malfunction. The ECM commands gear shifts by turning the shift
solenoid valves "ON/OFF". When the gear position commanded by the ECM and the actual gear position are
not same, the ECM illuminates the MIL and stores the DTC.

MONITOR STRATEGY

MONITOR STRATEGY TABLE

TYPICAL ENABLING CONDITIONS

ALL

TYPICAL ENABLING CONDITIONS TABLE

ECM gear shift command

1st 2nd 3rd 4th 5th 6th

*: Actual gear position under malfunction 1st 2nd 3rd 4th 4th 4th

Gear position under normal conditions

1st 2nd 3rd 4th 5th 6th

*: Actual gear position under fail-safe mode 1st 2nd 3rd 3rd 3rd 3rd

Related DTCs

P0766: Shift solenoid valve S4/OFF malfunction
P0776: Shift solenoid valve SL2/ON malfunction

Required sensors/Components

Shift solenoid valve S4, Speed sensor (NT), Speed
sensor (NC), Crankshaft position sensor (NE)

Frequency of operation

Continuous

Duration

0.4 sec.

MIL operation

2 driving cycles

Sequence of operation

None

The monitor will run whenever the following DTCs
are not stored

P0115 - P0118 (ECT sensor)
P0125 (Insufficient ECT for Closed Loop)
P0500 (VSS)
P0748 - P0798 (Trans solenoid (range))

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

TYPICAL ENABLING CONDITIONS TABLE

P0766 OFF malfunction (A) and P0776 ON malfunction (A)

TYPICAL ENABLING CONDITIONS TABLE

P0766 OFF malfunction (B) and P0776 ON malfunction (B)

TYPICAL ENABLING CONDITIONS TABLE

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 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

KCS sensor circuit

Not circuit malfunction

ETCS (Electric Throttle Control System)

Not system down

Transmission position

D

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

ECM selected gear

5th

Vehicle speed

2 km/h (1.2 MPH) or more

Throttle valve opening angle.

9% or more at 2000 RPM (Conditions vary with

engine speed)

ECM selected gear

6th

Vehicle speed

2 km/h (1.2 MPH) or more

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

TYPICAL MALFUNCTION THRESHOLDS

[OFF malfunction]

When both conditions below are met: OFF malfunction (A) and (B)

P0766 OFF malfunction (A)

TYPICAL MALFUNCTION THRESHOLDS TABLE

P0766 OFF malfunction (B)

TYPICAL MALFUNCTION THRESHOLDS TABLE

[ON malfunction]

When both conditions below are met: ON malfunction (A) and (B)

P0776 ON malfunction (A)

TYPICAL MALFUNCTION THRESHOLDS TABLE

P0776 ON malfunction (B)

TYPICAL MALFUNCTION THRESHOLDS TABLE

INSPECTION PROCEDURE

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.

Throttle valve opening angle

9% or more at 2000 RPM (Conditions vary with

engine speed)

Turbine speed/Output speed (NT/NO)

0.93 or more, and 1.07 or less (This means actual gear is 4th)

Turbine speed/Output speed (NT/NO)

0.93 or more, and 1.07 or less (This means actual gear is 4th)

Turbine speed/Output speed (NT/NO)

0.93 or more, and 1.07 or less (This means actual gear is 4th)

Turbine speed/Output speed (NT/NO)

0.93 or more, and 1.07 or less (This means actual gear is 4th)

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra