Toyota Tacoma (2015-2018) Service Manual: Pressure Control Solenoid "B" Circuit Open (P077513)
DESCRIPTION
Changing from 1st to 6th is performed by the ECM turning shift solenoid valves
SL1, SL2, SL3 and SL4 on and off. If an open or short circuit occurs in any of the
shift solenoid valves, the ECM controls the remaining normal shift solenoid valves
to allow the vehicle to be operated (See page .gif)
).
HINT:
The following table shows normal operation of the shift solenoid valves SL2 when the shift lever is in D.
Shift Solenoid Valve Operation:|
Gear |
1st |
2nd |
3rd |
4th |
5th |
6th |
|---|---|---|---|---|---|---|
|
Shift Solenoid Valve SL2 |
OFF |
OFF |
OFF |
ON |
ON |
ON |
|
DTC No. |
DTC Detection Condition |
Trouble Area |
SAE |
|---|---|---|---|
|
P077513 |
An open or short circuit (output signal duty is 0% or 100%) is detected by the ECM 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). |
|
P0778 |
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 or off. When there is an open or short circuit in any of the shift solenoid valve circuits, the ECM detects the problem and illuminates the MIL and stores the DTC. The ECM 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 ECM stops sending current to the circuit.)
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 (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 sec. |
|
MIL operation |
Immediately |
|
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
All:|
The monitor will run whenever the following DTCs are not stored |
None |
|
Solenoid current cut status |
Not cut |
|
Ignition switch |
ON |
|
Starter |
OFF |
|
Battery voltage |
12 V or higher |
|
Battery voltage |
10 V or higher, and below 12 V |
|
Target current |
Below 0.75 A |
|
Battery voltage |
8 V or higher |
|
Target current |
0.25 A or higher |
TYPICAL MALFUNCTION THRESHOLDS
One of the following conditions is met: Condition (A), (B) or (C)
Condition (A) and (B):|
Output duty cycle |
More than 100% |
|
Output duty cycle |
Less than 0% |
COMPONENT OPERATING RANGE
|
Output duty cycle |
More than 3%, and less than 100% |
CONFIRMATION DRIVING PATTERN
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
- After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
- When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure
(See page ).
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off and wait for 2 minutes or more.
- Turn the ignition switch to ON and turn the Techstream on.
- Start the engine.
- Perform the D Position Shift Test inspection in Road Test (See page
). [*1]
HINT:
[*1] : Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
- Input the DTC: P077513.
- Check the DTC judgment result.
Techstream Display
Description
NORMAL
- DTC judgment completed
- System normal
ABNORMAL
- DTC judgment completed
- System abnormal
INCOMPLETE
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
N/A
- Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Perform the universal trip to clear permanent DTCs (See page
).
- Perform registration and/or initialization when parts related to the
automatic transmission are replaced (See page
).
PROCEDURE
|
1. |
INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL2) |
|
(a) Disconnect the E1 transmission wire connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
15 (SL2+) - 16 (SL2-) |
20°C (68°F) |
5.0 to 5.6 Ω |
|
15 (SL2+) - Body ground |
Always |
10 kΩ or higher |
|
16 (SL2-) - Body ground |
Always |
10 kΩ or higher |
|
*a |
Component without harness connected (Transmission Wire) |
| NG | .gif) |
GO TO STEP 3 |
|
.gif)
|
2. |
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
|
(a) Disconnect the ECM connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
E12-20 (SL2+) - E12-19 (SL2-) |
20°C (68°F) |
5.0 to 5.6 Ω |
|
E12-20 (SL2+) - Body ground |
Always |
10 kΩ or higher |
|
E12-19 (SL2-) - Body ground |
Always |
10 kΩ or higher |
|
*a |
Rear view of wire harness connector (to ECM) |
| OK | |
REPLACE ECM |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
INSPECT SHIFT SOLENOID VALVE SL2 |
|
(a) Remove shift solenoid valve SL2 (See page
|
|
(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 |
|---|---|
|
Valve moves and makes an operating noise |
|
*1 |
Shift Solenoid Valve SL2 |
| OK | |
REPLACE TRANSMISSION WIRE |
| NG | |
REPLACE SHIFT SOLENOID VALVE SL2 |
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SYSTEM DESCRIPTION
The ECM uses the vehicle speed signal and signals from the transmission revolution
sensors (NT, SP2) to detect the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear).
The ECM com ...
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SYSTEM DESCRIPTION
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The ECM com ...
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Removal
REMOVAL
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the LH side and RH side.
The following procedure listed is for the LH side.
PROCEDURE
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NOTICE:
Immediately wash off any brake fluid that comes into contact with any pa ...
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