Toyota Tundra. Manual — part 2810

MONITOR DESCRIPTION

The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF" and switching oil pressure to
the valves in the valve body.

The DTC indicates that the sequence valve is locked in the direction the spring stretches and that shifting to the
6th gear is impossible.

MONITOR STRATEGY

MONITOR STRATEGY TABLE

TYPICAL ENABLING CONDITIONS

ALL

TYPICAL ENABLING CONDITIONS TABLE

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

P0729: Gear 6 incorrect ratio (Sequence
valve)/Rationality check

Required sensors/Components

Sequence valve

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

P0500 (VSS)
P0748 (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

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

TYPICAL ENABLING CONDITIONS TABLE

Condition (A)

TYPICAL ENABLING CONDITIONS TABLE

Condition (B)

TYPICAL ENABLING CONDITIONS TABLE

TYPICAL MALFUNCTION THRESHOLDS

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

Condition (A)

TYPICAL MALFUNCTION THRESHOLDS TABLE

Condition (B)

TYPICAL MALFUNCTION THRESHOLDS TABLE

INSPECTION PROCEDURE

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

Throttle valve opening angle

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

Turbine speed/Output speed (NT/NO)

0.66 or more, and 0.80 or less (This means actual gear is 5th)

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

1. CHECK DTC OUTPUT (IN ADDITION TO DTC P0729)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream on.

d. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes.

e. Read the DTCs using the Techstream.

Result

RESULT REFERENCE TABLE

HINT:

If any other codes besides P0729 are output, perform troubleshooting for those DTCs first.

B: GO TO DTC TABLE (See DIAGNOSTIC TROUBLE CODE TABLE )

A: Go to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (RUNNING 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. Connect the Techstream to the DLC3.

b. Clear the DTC (See DTC CHECK/CLEAR ).

c. Warm up the engine.

d. Enter the following menus: Powertrain/Engine and ECT/Active Test.

Result

Proceed to

Only P0729 is output

A

P0729 and other DTCs are output

B

CAUTION: This test should always be performed with at least 2 people.

NOTE:



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



Perform the test with the A/C turned off.

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

e. According to the display on the Techstream, perform the Active Test.

HINT:

While driving, the shift position can be forcibly changed with the Techstream.

Comparing the shift position commanded by the Active Test with the actual shift position enables
you to confirm the problem (see FAIL-SAFE TABLE ).

Engine and ECT:

ACTIVE TEST

HINT:



This test can be conducted when the vehicle speed is 50 km/h (31 MPH) or less.



The 4th to 5th and 5th to 6th up-shifts must be performed with the accelerator pedal released.



The 6th to 5th and 5th to 4th down-shifts must be performed with the accelerator pedal
released.



Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift
successively.



The shift position commanded by the ECM is shown in the Data List display on the
Techstream.



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

GEAR SHIFT POSITIONS TABLE

OK: Gear position changes in accordance with the Techstream command.

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

OK: Go to next step.

3. PERFORM ACTIVE TEST USING TECHSTREAM (SHIFT SOLENOID VALVE SLT)

Tester

Display

Test Part

Control Range

Diagnostic Note

Control the

Shift Position

Operate shift solenoid
valve and set each shift
position



Press "-->"
button: Shift
up



Press "<--"
button: Shift
down

Possible to check operation of shift
solenoid valves [Vehicle Condition] 50
km/h (31 MPH) or less

Techstream gear shift command

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

Actual gear position under malfunction 1st 2nd 3rd 4th 5th 4th

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra