Toyota Tundra. Manual — part 2811

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. Remove the test plug on the transmission case center right side and connect SST.

SST 09992-00095 (09992-00231, 09992-00271)

b. Connect the Techstream to the DLC3.

c. Start the engine and warm it up.

d. Measure the line pressure with SST.

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.

h. Measure the line pressure.

NOTE:



Perform the test at the normal operating ATF temperature: 50 to 80°C
(122 to 176°F).



Be careful to prevent SST's hose from interfering with the exhaust
pipe.



Perform the test with the A/C OFF.

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

Fig. 50: Measuring Line Pressure With SST
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Engine and ECT:

ACTIVE TEST

OK: The line pressure changes as specified when performing the Active Test.

NG: REPLACE SHIFT SOLENOID VALVE SLT (See DISASSEMBLY )

OK: Go to next step.

Tester

Display

Test Part

Control Range

Diagnostic

Note

Activate the

Solenoid

(SLT)*

Operate shift
solenoid SLT and
raise line pressure

ON or OFF
HINT:



OFF: Line pressure up (when Active
Test "Activate the Solenoid (SLT)" is
performed, ECM commands SLT
solenoid to turn OFF)



ON: No action (normal operation)

[Vehicle
Condition]



Vehicle
stopped



Engine
idling

HINT:
*: Activate the Solenoid (SLT) in the Active Test is performed to check the line pressure changes
by connecting SST to the automatic transmission, which is used in HYDRAULIC TEST as well.
Note that the pressure values in the Active Test and Hydraulic Test are different.

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

4. CLEAR DTC AND PERFORM RUNNING TEST

a. Clear the DTC (see DTC CHECK/CLEAR ).

b. Check for DTC again after conducting the MONITOR DRIVE PATTERN (see

INITIALIZATION ).

OK: No DTC code output.

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

OK: END

DTC P0748: PRESSURE CONTROL SOLENOID "A" ELECTRICAL (SHIFT SOLENOID VALVE
SL1)

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

P0748

The ECM checks for an open or short in the shift solenoid valve
SL1 circuit while driving and shifting between 4th and 5th gear (1
trip detection logic)
Output signal duty equals 100%
HINT:
SL1 output signal duty is less than 100% under normal condition



Open or short in shift
solenoid valve SL1
circuit



Shift solenoid valve
SL1



ECM

Terminal No. (Symbol)

Tool Setting

Condition

Specified Condition

D74-14 (SL1+) - D74-15 (SL1-)

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

Refer to Fig. 51

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

Fig. 51: 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 SL1 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 normal shift solenoid valves 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 between 4th
and 5th gears, if the ECM detects an open or short in the shift solenoid valve SL1 circuit, the ECM determines
that there is a malfunction (see FAIL-SAFE TABLE ).

MONITOR STRATEGY

MONITOR STRATEGY TABLE

TYPICAL ENABLING CONDITIONS

All

TYPICAL ENABLING CONDITIONS TABLE

Condition (A)

TYPICAL ENABLING CONDITIONS TABLE

Related DTCs

P0748: Shift solenoid valve SL1/Range check

Required sensors/Components

Shift solenoid valve SL1

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

None

Ignition switch

ON

Starter

OFF

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra