Toyota Tundra. Manual — part 2821

NG: REPLACE SHIFT SOLENOID VALVE S4 (See DISASSEMBLY )

OK: Go to next step.

4. INSPECT SHIFT SOLENOID VALVE SL2

a. Remove shift solenoid valve SL2.

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 with a 21 W bulb to terminal 1 and the negative (-) lead to

terminal 2 of the solenoid valve connector. Then check that the valve moves and makes an
operating noise.

OK: Valve moves and makes an operating noise.

Fig. 63: Identifying Shift Solenoid Valve SL2

Tester Connection Condition Specified Condition

1 - 2

20°C (68°F)

5.0 to 5.6 ohms

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE SHIFT SOLENOID VALVE SL2 (See REMOVAL )

OK: Go to next step.

5. 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 P0778: PRESSURE CONTROL SOLENOID "B" ELECTRICAL (SHIFT SOLENOID VALVE
SL2)

DESCRIPTION

Shifting from 1st to 5th is performed in combination with the ON and OFF operation of the shift solenoid
valves SL1, SL2, S1, S2, S3, S4 and SR, which are controlled by the ECM. If an open or short circuit occurs in
the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be
operated safely (see FAIL-SAFE TABLE ).

DTC DETECTION CONDITION TABLE

Reference: Inspect using an oscilloscope.

Check the waveform of the ECM connector.

Standard

WAVEFORM REFERENCE TABLE

DTC

Code

DTC Detection Condition

Trouble Area

P0778

The ECM checks for an open or short in the shift solenoid valve SL2
circuit while driving and shifting gears (1 trip detection logic) Output
signal duty ratio equals 100% (SL2 output signal duty ratio is less than
100% under normal condition)



Open or short in
shift solenoid
valve SL2 circuit



Shift solenoid
valve SL2



ECM

Terminal No. (Symbol)

Tool Setting

Condition

Specified Condition

D74-12 (SL2+) - D74-13 (SL2-)

5 V/DIV., 1 msec./ DIV. Engine is idling

Refer to Fig. 64

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

Fig. 64: Identifying Waveform
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

MONITOR DESCRIPTION

This DTC indicates an open or short in the shift solenoid valve SL2 circuit. The ECM commands gear shifts by
turning the shift solenoid valves ON/OFF. When there is an open or short circuit in any shift solenoid valve
circuit, the ECM detects the problem, illuminates the MIL and stores the DTC. Also, the ECM performs the
fail-safe function and turns the other shift solenoid valves that are in good condition ON/OFF. In case of an
open or short circuit, the ECM stops sending current to the open or short circuited solenoid.

While driving and shifting gears, if the ECM detects an open or short in the shift solenoid valve SL2 circuit, the
ECM determines there is a malfunction (see FAIL-SAFE TABLE ).

MONITOR STRATEGY

MONITOR STRATEGY TABLE

TYPICAL ENABLING CONDITIONS

All

TYPICAL ENABLING CONDITIONS TABLE

Related DTCs

P0778: Shift solenoid valve SL2/Range check

Required sensors/Components

Shift solenoid valve SL2

Frequency of operation

Continuous

Duration

1 sec.

MIL operation

Immediately

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)

Ignition switch

ON

Starter

OFF

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

Condition (A)

TYPICAL ENABLING CONDITIONS TABLE

Condition (B)

TYPICAL ENABLING CONDITIONS TABLE

TYPICAL MALFUNCTION THRESHOLDS

When either condition below is met: Condition (A) or (B)

Condition (A)

TYPICAL MALFUNCTION THRESHOLDS TABLE

Condition (B)

TYPICAL MALFUNCTION THRESHOLDS TABLE

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE TABLE

WIRING DIAGRAM

Solenoid current cut status

Not cut

Battery voltage

11 V or higher

Target current

0.1 A or higher

Battery voltage

8 V or higher

Solenoid status from Hybrid IC

Failure

Hybrid IC status

Failure

Output signal duty

Less than 100%

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra