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 | |
