- Open or short in shift solenoid valve SL2 circuit
- Shift solenoid valve SL2
- Transmission wire
- TCM
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VIMX |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 08/2016] |
| Title: U660F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: P0778; Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2); 2016 MY Sienna [12/2015 - 08/2016] | ||
|
DTC |
P0778 |
Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2) |
DESCRIPTION
Changing from 1st to 6th is performed by the TCM turning shift solenoid valves SL1, SL2, SL3, SL4 and SL on and off. If an open or short circuit occurs in any of the shift solenoid valves, the TCM controls the remaining normal shift solenoid valves to allow the vehicle to be operated (See page
![2016 MY Sienna [12/2015 - 08/2016]; U660F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: FAIL-SAFE CHART](/t3Portal/stylegraphics/info.gif)
).
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0778 |
An open or short circuit (output signal duty is 0% or 100%) is detected by the TCM in the shift solenoid valve SL2 circuit while driving and shifting gears (SL2 output signal duty is more than 3% and less than 100% under normal conditions) (1-trip detection logic). |
|
MONITOR DESCRIPTION
This DTC indicates an open or short in the shift solenoid valve SL2 circuit. The TCM commands gear shifts by turning the shift solenoid valves on or off. When there is an open or short circuit in any of the shift solenoid valve circuits, the TCM detects the problem and illuminates the MIL and stores the DTC. The TCM also performs the fail-safe function and turns the other normal shift solenoid valves on or off. (In case of an open or short circuit, the TCM stops sending current to the circuit.)
While driving and shifting gears, if the TCM detects an open or short in the shift solenoid valve SL2 circuit, the TCM determines there is a malfunction (See page
).
MONITOR STRATEGY
|
Related DTCs |
P0778: Shift solenoid valve SL2/Range check |
|
Required sensors/Components |
Shift solenoid valve SL2 |
|
Frequency of operation |
Continuous |
|
Duration |
1 second |
|
MIL operation |
Immediately |
|
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
All:
|
The monitor will run whenever this DTC is not present |
None |
|
Ignition switch |
ON |
|
Starter |
OFF |
Condition (A):
One of the following conditions is met: (a) or (b)|
a. Battery voltage |
12 V or more |
|
b. All of the following conditions are met |
|
|
Battery voltage |
10 V or more and less than 12 V |
|
Target current |
Less than 0.75 A |
Condition (B):
|
Battery voltage |
8 V or more |
|
Target current |
0.25 A or more |
TYPICAL MALFUNCTION THRESHOLDS
Condition (A):
|
Output duty cycle |
100% or more |
Condition (B):
|
Output duty cycle |
0% or less |
COMPONENT OPERATING RANGE
|
Output duty cycle |
More than 3% and less than 100% |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Perform the universal trip to clear permanent DTCs (See page
).
HINT:
The following table shows normal operation of the shift solenoid valve SL2 when the shift lever is in D:
|
TCM commanded gear |
1st |
2nd |
3rd |
4th |
5th |
6th |
|
Shift solenoid valve SL2 |
OFF |
OFF |
OFF |
ON |
ON |
ON |
PROCEDURE
|
1. |
INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL2) |
|
(a) Remove the TCM from the transaxle. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
9 (SL2+) - 8 (SL2-) |
20°C (68°F) |
5.0 to 5.6 Ω |
|
9 (SL2+) - Body ground |
Always |
10 kΩ or higher |
|
8 (SL2-) - Body ground |
Always |
10 kΩ or higher |
|
9 (SL2+) - All other terminals except 8 (SL2-) |
Always |
10 kΩ or higher |
|
8 (SL2-) - All other terminals except 9 (SL2+) |
Always |
10 kΩ or higher |
Text in Illustration
|
*a |
Component without harness connected (Transmission Wire) |
| OK |
|
|
|
2. |
INSPECT SHIFT SOLENOID VALVE SL2 |
|
(a) Remove shift solenoid valve SL2. |
|
(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 SL2) |
(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.
| OK |
|
| NG |
|
|
|