Toyota Tundra. Manual — part 2815

3. INSPECT SHIFT SOLENOID VALVE S1

a. Remove shift solenoid valve S1.

b. Measure the resistance according to the value (s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

c. Connect the battery's positive (+) lead to the terminal of the solenoid valve connector, and the

negative (-) lead to the solenoid valve body. Then check that the valve moves and makes an
operating noise.

OK: Valve moves and makes an operating noise.

Fig. 57: Inspecting Shift Solenoid Valve S1
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE SHIFT SOLENOID VALVE S1 (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.

Tester Connection

Condition

Specified

Condition

Shift solenoid valve S1 connector terminal - Shift solenoid valve
S1 body

20°C (68°

F)

11 to 15 ohms

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

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

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

DTC P0756: SHIFT SOLENOID "B" PERFORMANCE (SHIFT SOLENOID VALVE S2)

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

HINT:

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

GEAR SHIFT POSITIONS TABLE

DTC

Code

DTC Detection Condition

Trouble Area

P0756

S2 stuck ON malfunction*1:
Shifting to 3rd and 5th 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 6th.

b. When the ECM directs the transmission to switch to 6th

gear, the actual gear is shifted to 6th.



Shift solenoid valve S2
remains open



Valve body is blocked



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



ECM

P0756

S2 stuck OFF malfunction*2:
The vehicle starts in 3rd gear and shifting to 6th gear 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 1st

gear, the actual gear is shifted to 3rd.

b. When the ECM directs the transmission to switch to 6th

gear, the actual gear is shifted to 5th.



Shift solenoid valve S2
remains closed



Valve body is blocked



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



ECM

ECM gear shift command

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

*1: Actual gear position under S2 stuck ON malfunction

1st 2nd 2nd 4th 6th 6th

*2: Actual gear position under S2 stuck OFF malfunction

3rd 3rd 3rd 4th 5th 5th

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

MONITOR DESCRIPTION

This DTC indicates a stuck ON malfunction or stuck OFF malfunction of the shift solenoid valve S2. 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 the same, the ECM illuminates the MIL and stores the DTC.

MONITOR STRATEGY

MONITOR STRATEGY TABLE

TYPICAL ENABLING CONDITIONS

All

TYPICAL ENABLING CONDITIONS TABLE

Related DTCs

P0756: Shift solenoid valve S2/OFF malfunction, Shift
solenoid valve S2/ON malfunction

Required sensors/Components

Shift solenoid valve S2

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)

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

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

TYPICAL ENABLING CONDITIONS TABLE

OFF malfunction (A)

TYPICAL ENABLING CONDITIONS TABLE

OFF malfunction (B)

TYPICAL ENABLING CONDITIONS TABLE

ON malfunction (A)

TYPICAL ENABLING CONDITIONS TABLE

ON malfunction (B)

TYPICAL ENABLING CONDITIONS TABLE

TYPICAL MALFUNCTION THRESHOLDS

[OFF malfunction]

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

1st

Vehicle speed

2 km/h (1.2 MPH) or more, and less than 40 km/h

(24.9 MPH)

Engine speed - Turbine speed (NE - NT)

50 RPM or more

ECM selected gear

6th

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

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

Throttle valve opening angle

9% or more at 2000 RPM (Conditions vary with engine speed)

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra