Toyota Tundra Service Manual: Transmission Component Slipping (P0894,P2714)

DESCRIPTION

Shift solenoid valve SLT controls the transmission line pressure for smooth transmission operation based on signals from the throttle position sensor and vehicle speed sensor. The ECM adjusts the current to shift solenoid valve SLT to control the hydraulic line pressure coming from the primary regulator valve.

Appropriate line pressure assures smooth shifting with varying engine outputs.

DTC Code

DTC Detection Condition

Trouble Area

P0894

The ECM detects a malfunction in shift solenoid valve SLT, S1, S2, S3, S4 or SL2, or the 1-2 shift valve, or an incorrect gear 6 ratio according to the difference in speed of the turbine and output shaft, and also by the oil pressure (2-trip detection logic).

  • Shift solenoid valve SLT remains open or closed
  • Shift solenoid valve S1, S2, S3, S4 or SL2 remains open or closed
  • Gear 6 incorrect ratio (sequence valve) or 1-2 shift valve is stuck
  • Valve body is blocked
  • Automatic transmission (clutch, brake, gear, etc.)

P2714

The ECM detects a malfunction in shift solenoid valve SLT (ON side) according to the difference in speed of the turbine and output shaft, and also by the oil pressure (2-trip detection logic).

  • Shift solenoid valve SLT remains open or closed
  • Shift solenoid valve S1, S2, S3, S4 or SL2 remains open or closed
  • Gear 6 incorrect ratio (sequence valve) or 1-2 shift valve is stuck
  • Valve body is blocked
  • Automatic transmission (clutch, brake, gear, etc.)

MONITOR DESCRIPTION

The ECM calculates the amount of heat absorbed by the friction material based on the difference in speed (clutch slippage) between the turbine and output shaft. The ECM illuminates the MIL and stores this DTC when the amount of heat absorption exceeds the specified value.

There are two causes of speed difference.

  • When the shift solenoid valve SLT remains ON, oil pressure decreases, which causes the clutch engagement force to decrease.
  • When a shift solenoid valve remains ON or OFF, the gear position commanded by the ECM and the actual gear position are not the same.

NOTICE:

If you continue driving under these conditions, the clutch will burn out and the vehicle will no longer be drivable.

MONITOR STRATEGY

Related DTCs

P0894: Automatic transmission slip malfunction

P2714: Shift solenoid valve SLT/Functional check

Required sensors/Components

Shift solenoid valve SLT

Frequency of operation

Continuous

Duration

P0894 ON malfunction (A): Immediately

P0894 ON malfunction (B): 0.4 seconds

P2714: Immediately

MIL operation

2 driving cycles

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All

The monitor will run whenever the following DTCs are not present

P0717 (Turbine speed sensor circuit)

P0722 (Output Speed Sensor circuit)

P0710, P0712, P0713, P2740, P2742, P2743 (ATF temperature sensor circuit)

P0973, P0974 (Shift solenoid valve S1 circuit)

P0976, P0977 (Shift solenoid valve S2 circuit)

P0979, P0980 (Shift solenoid valve S3 circuit)

P0982, P0983 (Shift solenoid valve S4 circuit)

P0985, P0986 (Shift solenoid valve SR circuit)

P0748 (Shift solenoid valve SL1 circuit)

P0778 (Shift solenoid valve SL2 circuit)

P2716 (Shift solenoid valve SLT circuit)

P0115, P0116, P0117, P0118, P011B (ECT (Engine coolant temperature) sensor circuit)

P0327, P0328, P032C, P032D (KCS sensor circuit)

ETCS (Electric Throttle Control System)

Not system down

Transmission position

"D"

Duration time from shifting "N" to "D"

4 seconds 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

TYPICAL MALFUNCTION THRESHOLDS

[P0894: ON malfunction]
  • When either condition below is met: ON malfunction (A) or (B)
ON Malfunction (A)

Summation of C1 clutch heat generations

Specified value

ON Malfunction (B)

Summation of C2 clutch heat generations

Specified value

Actual gear for SLT failure judgment

Not determined

[P2714: ON malfunction]
  • One of the following conditions is met: ON malfunction (A), (B), (C), (D), (E), (F), (G) or (H)
ON Malfunction (A)

Summation of C1 clutch heat generations

Specified value

ON Malfunction (B)

Shift solenoid valve S1 OFF malfunction

Detected

ON Malfunction (C)

Shift solenoid valve S2 OFF malfunction

Detected

ON Malfunction (D)

Shift solenoid valve S3 ON malfunction

Detected

ON Malfunction (E)

Shift solenoid valve S4 OFF malfunction

Detected

ON Malfunction (F)

1-2 shift valve malfunction

Detected

ON Malfunction (G)

Reverse sequence valve malfunction

Detected

ON Malfunction (H)

Shift solenoid valve SL2 ON malfunction

Detected

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs (See page ).

PROCEDURE

1.

CHECK DTC OUTPUT (IN ADDITION TO DTCS P0894 AND P2714)

(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

Proceed to

  • Only P0894 is output
  • Only P0894 and P2714 are output

A

P0894, P2714 and other DTCs are output

B

HINT:

If any other codes besides P0894 and P2714 are output, perform troubleshooting for those DTCs first.

B

GO TO DTC CHART

A

2.

PERFORM ACTIVE TEST USING TECHSTREAM (SHIFT SOLENOID VALVE SLT)

NG

GO TO STEP 17

OK

3.

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 page ).

(c) Enter the following menus: Powertrain / Engine and ECT / Active Test.

(d) According to the display on the Techstream, perform the Active Test.

HINT:

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

Engine and ECT

Tester Display

Test Part

Control Range

Diagnostic Note

Control the Shift Position

Operate shift solenoid valves and set each shift position

  • Press "→" button: Shift up
  • Press "←" button: Shift down

Possible to check operation of the shift solenoid valves.

[Vehicle Condition]

50 km/h (30 mph) or less

HINT:

  • This test can be conducted when the vehicle speed is 50 km/h (30 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.

(e) Compare the ECM gear shift command and the actual gear position.

Result

ECM Gear Shift Command

1st

2nd

3rd

4th

5th

6th

Proceed to

Actual gear position under malfunction

Shift solenoid S1

Stuck ON*1

2nd

2nd

3rd

4th

5th

6th

A

Stuck OFF

1st

1st

3rd

4th

5th

N*2

Shift solenoid S2

Stuck ON

1st

2nd

2nd

4th

6th

6th

B

Stuck OFF

3rd

3rd

3rd

4th

5th

5th

Shift solenoid S3

Stuck ON

1st

2nd

3rd

3rd

N*2

N*2

C

Stuck OFF

3rd

4th

4th

4th

5th

6th

Shift solenoid S4

Stuck ON*3

1st

2nd

3rd

4th

5th

6th

D

Stuck OFF

1st

2nd

3rd

4th

4th

4th

Actual gear position when normal

1st

2nd

3rd

4th

5th

6th

E

HINT:

  • *1: When shift solenoid S1 is stuck ON, the vehicle cannot drive in reverse.
  • *2: Neutral
  • *3: When shift solenoid S4 is stuck ON, gear shifting is normal.
B

GO TO STEP 7

C

GO TO STEP 10

D

GO TO STEP 13

E

GO TO STEP 20

A

4.

INSPECT SHIFT SOLENOID VALVE S1

NG

REPLACE SHIFT SOLENOID VALVE S1

OK

5.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

OK

6.

INSPECT TORQUE CONVERTER ASSEMBLY

(a) Check the torque converter assembly (See page ).

OK:

The torque converter operates normally.

OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY

NG

REPLACE TORQUE CONVERTER ASSEMBLY

7.

INSPECT SHIFT SOLENOID VALVE S2

NG

REPLACE SHIFT SOLENOID VALVE S2

OK

8.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

OK

9.

INSPECT TORQUE CONVERTER ASSEMBLY

(a) Check the torque converter assembly (See page ).

OK:

The torque converter operates normally.

OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY

NG

REPLACE TORQUE CONVERTER ASSEMBLY

10.

INSPECT SHIFT SOLENOID VALVE S3

NG

REPLACE SHIFT SOLENOID VALVE S3

OK

11.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

OK

12.

INSPECT TORQUE CONVERTER ASSEMBLY

(a) Check the torque converter assembly (See page ).

OK:

The torque converter operates normally.

OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY

NG

REPLACE TORQUE CONVERTER ASSEMBLY

13.

INSPECT SHIFT SOLENOID VALVE S4

NG

REPLACE SHIFT SOLENOID VALVE S4

OK

14.

INSPECT SHIFT SOLENOID VALVE SL2

NG

REPLACE SHIFT SOLENOID VALVE SL2

OK

15.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

OK

16.

INSPECT TORQUE CONVERTER ASSEMBLY

(a) Check the torque converter assembly (See page ).

OK:

The torque converter operates normally.

OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY

NG

REPLACE TORQUE CONVERTER ASSEMBLY

17.

INSPECT SHIFT SOLENOID VALVE SLT

(a) Remove shift solenoid valve SLT.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 - 2

20°C (68°F)

5.0 to 5.6 Ω

(c) Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.

OK:

Measurement Condition

Specified Condition

  • Battery positive (+) with a 21 W bulb → Terminal 2
  • Battery negative (-) → Terminal 1

Valve moves and makes an operating noise

Text in Illustration

*a

Component without harness connected

(Shift Solenoid Valve SLT)

NG

REPLACE SHIFT SOLENOID VALVE SLT

OK

18.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

OK

19.

INSPECT TORQUE CONVERTER ASSEMBLY

(a) Check the torque converter assembly (See page ).

OK:

The torque converter operates normally.

OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY

NG

REPLACE TORQUE CONVERTER ASSEMBLY

20.

INSPECT SHIFT SOLENOID VALVE SLT

(a) Remove shift solenoid valve SLT.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 - 2

20°C (68°F)

5.0 to 5.6 Ω

(c) Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.

OK:

Measurement Condition

Specified Condition

  • Battery positive (+) with a 21 W bulb → Terminal 2
  • Battery negative (-) → Terminal 1

Valve moves and makes an operating noise

Text in Illustration

*a

Component without harness connected

(Shift Solenoid Valve SLT)

NG

REPLACE SHIFT SOLENOID VALVE SLT

OK

21.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

OK

22.

INSPECT TORQUE CONVERTER ASSEMBLY

(a) Check the torque converter assembly (See page ).

OK:

The torque converter operates normally.

OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY

NG

REPLACE TORQUE CONVERTER ASSEMBLY

    1-2 Shift (1-2 Shift Valve) (P0781)

    Shift Solenoid "A" Control Circuit Low (Shift Solenoid Valve S1) (P0973,P0974)

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