- Open or short in shift solenoid valve SL2 circuit
- Shift solenoid valve SL2
- ECM
| Last Modified: 11-29-2007 | 1.6 C | |
| Service Category: Drivetrain | Section: Automatic Transmission/Transaxle | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000000W8G04MX |
| Title: AB60E AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSMISSION SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
DTC |
P0778 |
Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2) |
DESCRIPTION
Shifting from 1st to 5th is performed in combination with the ON and OFF operation of the shift solenoid valves SL1, SL2, S1, S2, S3, S4 and SR, which are controlled by the ECM. If an open or short circuit occurs in the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated safely
.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0778 |
The ECM checks for an open or short in the shift solenoid valve SL2 circuit while driving and shifting gears (1 trip detection logic) Output signal duty ratio equals to 100% HINT: SL2 output signal duty ratio is less than 100% under normal condition |
|
Inspect using an oscilloscope:
Check the waveform of the ECM connector.
Standard:
Refer to the illustration.
|
Item |
Content |
|---|---|
|
Terminal No. (Symbol) |
D56-12 (SL2+) - D56-13 (SL2-) |
|
Tool setting |
5 V/DIV., 1 msec./DIV. |
|
Condition |
Engine is idling |
MONITOR DESCRIPTION
This DTC indicates an open or short in the shift solenoid valve SL2 circuit. The ECM commands gear shifts by turning the shift solenoid valves ON/OFF. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores the DTC. Also, the ECM performs the fail-safe function and turns the other shift solenoid valves that are in good condition ON/OFF. In case of an open or short circuit, the ECM stops sending the current to the open or short circuited solenoid.
While driving and shifting gears, if the ECM detects an open or short in the shift solenoid valve SL2 circuit, the ECM determines there is a malfunction
.
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 the following DTCs are not present |
P0115 - P0118: ECT sensor P0125: Insufficient ECT for closed loop P0500: VSS P0748 - P0799: Trans solenoid (range) |
|
Ignition switch |
ON |
|
Starter |
OFF |
All of the following conditions are met: Condition (A) and (B)
Condition (A)
|
Solenoid current cut status |
Not cut |
|
Battery voltage |
11 V or more |
|
Target current |
0.1 A or more |
Condition (B)
|
Battery voltage |
8 V or more |
TYPICAL MALFUNCTION THRESHOLDS
When either condition below is met: Condition (A) or (B)
Condition (A)
|
Solenoid status from Hybrid IC |
Failure |
Condition (B)
|
Hybrid IC status |
Failure |
COMPONENT OPERATING RANGE
|
Output signal duty |
Less than 100% |
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
The shift solenoid valve SL2 is turned ON/OFF normally when the shift lever is on D:
|
ECM gear shift command |
1st |
2nd |
3rd |
4th |
5th |
6th |
|
Shift solenoid valve SL2 |
ON |
ON |
ON |
ON |
OFF |
OFF |
PROCEDURE
|
1. |
INSPECT NO. 2 TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL2) |
|
(a) Disconnect the D42 No. 2 transmission wire connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2 (SL2+) - 4 (SL2-) |
20°C (68°F) |
5.0 to 5.6 Ω |
|
2 (SL2+) - Body ground |
Always |
10 kΩ or higher |
|
4 (SL2-) - Body ground |
Always |
10 kΩ or higher |
|
|
2. |
CHECK HARNESS AND CONNECTOR (NO. 2 TRANSMISSION WIRE - ECM) |
(a) Disconnect the D56 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D56-12 (SL2+) - D56-13 (SL2-) |
20°C (68°F) |
5.0 to 5.6 Ω |
|
D56-12 (SL2+) - Body ground |
Always |
10 kΩ or higher |
|
D56-13 (SL2-) - Body ground |
Always |
10 kΩ or higher |
|
|
3. |
INSPECT SHIFT SOLENOID VALVE SL2 |
(a) Remove the 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 |
(c) Connect the battery positive (+) lead with a 21 W bulb to terminal 1 and the negative (-) lead to terminal 2 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.
OK:
Valve moves and makes an operating noise.
|
|
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