- When 1st gear is commanded, 2nd gear is engaged.
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VIKP |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 08/2016] |
| Title: U660E (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: P0796; Pressure Control Solenoid "C" Performance (Shift Solenoid Valve SL3); 2016 MY Sienna [12/2015 - 08/2016] | ||
|
DTC |
P0796 |
Pressure Control Solenoid "C" Performance (Shift Solenoid Valve SL3) |
DESCRIPTION
The TCM uses the vehicle speed signal and signals from the transmission speed sensors (NC, NT) to detect the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear).
Then the TCM compares the actual gear with the shift schedule in the TCM memory to detect mechanical problems of the shift solenoid valves and valve body.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0796 |
The engine revs freely when 2nd or 6th gear is commanded (2 trip detection logic). When the following is detected twice (2 trip detection logic): |
|
MONITOR DESCRIPTION
The TCM commands gear shifts by turning the shift solenoid valves on and off. According to the engine speed (NE), input speed (NT) and output speed (NC), the TCM detects the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear). When the gear commanded by the TCM and the actual gear are not the same, the TCM illuminates the MIL and stores the DTC.
MONITOR STRATEGY
|
Related DTCs |
P0796: Shift solenoid valve SL3/OFF malfunction Shift solenoid valve SL3/ON malfunction |
|
Required sensors/Components |
Shift solenoid valve SL3, Input speed sensor (NT), Output speed sensor (NC), Crankshaft position sensor (NE) |
|
Frequency of operation |
Continuous |
|
Duration |
OFF malfunction (A) and (B) 0.5 seconds OFF malfunction (C) and (D) 0.8 seconds ON malfunction 0.8 seconds |
|
MIL operation |
2 driving cycles |
|
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
ALL:
|
The monitor will run whenever this DTC is not present. (Not circuit malfunction) |
P0712, P0713 (ATF temperature sensor circuit (TFT sensor)) P0115, P0117, P0118 (ECT sensor circuit) P0715, P0717 (Input speed sensor (NT) circuit) P0791, P0793 (Output speed sensor (NC) circuit) P0748 (Shift solenoid valve SL1 circuit) P0778 (Shift solenoid valve SL2 circuit) P0798 (Shift solenoid valve SL3 circuit) P2810 (Shift solenoid valve SL4 circuit) P0327, P0328, P0332, P0333 (KCS sensor circuit) P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P060A, P060B, P060D, P060E, P0657, P1607, P2102, P2103, P2111, P2112, P2118, P2119, P2135 ((ETCS) Electronic throttle control system) U0100 (CAN communication system) |
|
Transmission range |
D |
|
TFT (Transmission fluid temperature) |
-10°C (14°F) or more |
|
TFT (Transmission fluid temperature) sensor circuit |
No circuit malfunction |
|
ECT (Engine coolant temperature) sensor circuit |
No circuit malfunction |
|
Input speed sensor (NT) circuit |
No circuit malfunction |
|
Output speed sensor (NC) circuit |
No circuit malfunction |
|
Shift solenoid valve SL1 circuit |
No circuit malfunction |
|
Shift solenoid valve SL2 circuit |
No circuit malfunction |
|
Shift solenoid valve SL3 circuit |
No circuit malfunction |
|
Shift solenoid valve SL4 circuit |
No circuit malfunction |
|
KCS (Knock control sensor circuit) |
No circuit malfunction |
|
(ETCS) Electronic throttle control system |
Not system down |
|
CAN communication system |
Not system down |
|
Engine |
Starting |
OFF malfunction (A):
|
TCM selected gear |
2nd |
|
Throttle valve opening angle |
3% or more |
|
TCM indicated pressure value of SL1 |
1200 kPa |
|
TCM indicated pressure value of SL2 |
0 kPa |
|
TCM indicated pressure value of SL3 |
1200 kPa |
OFF malfunction (B):
|
TCM selected gear |
6th |
|
Throttle valve opening angle |
3% or more |
|
TCM indicated pressure value of SL1 |
0 kPa |
|
TCM indicated pressure value of SL2 |
1200 kPa |
|
TCM indicated pressure value of SL3 |
1200 kPa |
OFF malfunction (C):
|
TCM selected gear |
2nd |
|
Throttle valve opening angle: |
|
|
(When condition "D" is not detected) |
4.5% or more at engine speed 2000 rpm (condition varies with engine speed) |
|
(When condition "D" is detected) |
1.5% or more at output speed 750 rpm (condition varies with output speed) |
|
Engine coolant temperature |
40°C (104°F) or more |
OFF malfunction (D):
|
Throttle valve opening angle |
1.5% or more at output speed 750 rpm (condition varies with output speed) |
ON malfunction:
|
TCM selected gear |
1st |
|
Vehicle speed |
2 to 40 km/h (1.2 to 24.9 mph) |
|
Engine speed (NE) - Input speed (NT) |
50 rpm or more |
|
Engine coolant temperature |
40°C (104°F) or more |
TYPICAL MALFUNCTION THRESHOLDS
Either of the following conditions is met: OFF malfunction (A) or (B) or ((C) and (D)), or ON malfunctions
-
2 detections are necessary per driving cycle:
- 1st detection; temporary flag ON
- 2nd detection; pending fault code ON
OFF malfunction (A):
|
Input speed (NT) - Output speed (NC) x 2nd gear ratio |
1000 rpm or more |
OFF malfunction (B):
|
Input speed (NT) - Output speed (NC) x 6th gear ratio |
1000 rpm or more |
OFF malfunction (C):
|
Input speed (NT) / Output speed (NC) |
3.304 to 7.724 |
OFF malfunction (D):
|
Input speed (NT) / Output speed (NC) |
3.304 to 7.724 |
ON malfunction:
|
Input speed (NT) / Output speed (NC) |
1.901 to 2.340 |
CAUTION / NOTICE / HINT
NOTICE:
Perform the universal trip to clear permanent DTCs (See page
![2016 MY Sienna [12/2015 - 08/2016]; U660E (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
).
PROCEDURE
|
1. |
CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0796) |
(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 / ECT / Trouble Codes.
(e) Read the DTCs using the Techstream.
Result
|
Result |
Proceed to |
|---|---|
|
P0796 and other DTCs are output |
A |
|
Only P0796 is output |
B |
HINT:
If a solenoid is stuck off, DTCs for several solenoids including the malfunctioning solenoid will be detected.
| B |
|
|
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE SHIFT POSITION) |
NOTICE:
This test should always be performed with at least 2 people.
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / ECT / Active Test.
(g) According to the display on the Techstream, perform the Active Test.
HINT:
Comparing the gear commanded by the Active Test with the actual gear enables confirmation of the problem (See page
).
ECT
|
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Control the Shift Position |
Operates the shift solenoid valves to allow gears to selected manually. |
|
Can be used to check the operation of the shift solenoid valves. Upshifts and downshifts should be performed consecutively. A 10-second interval is required between gear changes. Do not downshift at high speeds. Doing so will damage the automatic transaxle. [Vehicle Condition] 50 km/h (30 mph) or less |
NOTICE:
- This test can be conducted when the vehicle is stopped.
- When shifting gears using the Active Test function, do not operate the accelerator pedal for 2 seconds before and after shifting gears.
HINT:
The gear commanded by the TCM is shown in the Data List / Shift Status display on the Techstream.
(h) Check the vehicle speed and the gear when the engine speed is 1000 rpm.
HINT:
Because the torque converter clutch has not engaged, it may be difficult to obtain the speeds specified in 4th, 5th, and 6th gear, however a difference of speed should still be evident following each gear change.
Standard:
|
1st |
2nd |
3rd |
4th |
5th |
6th |
|---|---|---|---|---|---|
|
8 to 12 km/h (5 to 7.5 mph) |
15 to 19 km/h (9.3 to 11.8 mph) |
21 to 25 km/h (13.0 to 15.5 mph) |
31 to 35 km/h (19.3 to 21.7 mph) |
44 to 48 km/h (27.3 to 29.8 mph) |
52 to 56 km/h (32.3 to 34.8 mph) |
(i) Compare the TCM commanded gear and the actual gear.
Result
|
Actuator Gear during Malfunction |
TCM Commanded Gear |
Proceed to |
||||||
|---|---|---|---|---|---|---|---|---|
|
1st |
2nd |
3rd |
4th |
5th |
6th |
|||
|
Shift solenoid SL1 |
Stuck ON |
1st |
2nd |
3rd |
4th |
4th |
4th |
A |
|
Stuck OFF |
N*1 |
N*1 |
N*1 |
N*1 |
5th |
6th |
||
|
Shift solenoid SL2 |
Stuck ON |
4th |
4th |
4th |
4th |
5th |
6th |
B |
|
Stuck OFF |
1st |
2nd |
3rd |
1st |
N*1 |
N*1 |
||
|
Shift solenoid SL3 |
Stuck ON |
2nd |
2nd |
3rd |
4th |
5th |
6th |
C |
|
Stuck OFF |
1st |
1st |
3rd |
4th |
5th |
N*1 |
||
|
Shift solenoid SL4 |
Stuck ON*3 |
3rd |
3rd |
3rd |
4th |
5th |
5th |
D |
|
Stuck OFF |
1st |
2nd |
1st |
4th |
N*1 |
6th |
||
|
Shift solenoid SLT |
Stuck ON |
N*2 |
N*2 |
N*2 |
N*2 |
N*2 |
N*2 |
E |
|
Stuck OFF*3 |
1st |
2nd |
3rd |
4th |
5th |
6th |
||
HINT:
- *1: Neutral
- *2: If shift solenoid SLT is stuck on, the line pressure will be low. Therefore, the amount of torque that can be transmitted by each gear is lower than the normal limit. When the engine power exceeds this lowered limit, the engine speed will increase freely.
- *3: When shift solenoid SLT is stuck off, gear shifting is normal.
| A |
|
GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE (SL1) PERFORMANCE DTC P0746) |
| B |
|
GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE (SL2) PERFORMANCE DTC P0776) |
| D |
|
GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE (SL4) PERFORMANCE DTC P2808) |
| E |
|
GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE (SLT) PERFORMANCE DTC P2714) |
|
|
3. |
INSPECT SHIFT SOLENOID VALVE SL3 |
|
(a) Remove shift solenoid valve SL3. |
|
(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 |
Text in Illustration
|
*a |
Component without harness connected: (Shift Solenoid Valve SL3) |
(c) Connect a battery positive (+) lead with a 21 W bulb to terminal 2 and a negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating sound.
OK:
Valve moves and makes an operating sound.
| NG |
|
|
|
4. |
INSPECT TRANSMISSION VALVE BODY ASSEMBLY |
(a) Check the transmission valve body assembly (See page
).
OK:
There are no foreign objects on each valve and they operate smoothly.
| OK |
|
| NG |
|
|
|