Toyota Tacoma (2015-2018) Service Manual: Pressure Control Solenoid "B" Circuit Open (P077513)

Toyota Tacoma (2015-2018) Service Manual / Ac60e Automatic Transmission / Transaxle / Automatic Transmission System(for 2gr-fks) / 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 HINT: ).

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).	Open or short in shift solenoid valve SL2 circuit Shift solenoid valve SL2 ECM	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 ).

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

Condition (A):

Battery voltage

12 V or higher

Condition (B):

Battery voltage	10 V or higher, and below 12 V
Target current	Below 0.75 A

Condition (C):

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%

Condition (C):

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

Text in Illustration

*a	Component without harness connected (Transmission Wire)

GO TO STEP 3

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

Text in Illustration

*a	Rear view of wire harness connector (to ECM)

REPLACE ECM

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

OK:

Measurement Condition	Specified Condition
Battery positive (+) with a 21 W bulb → Terminal 1 Battery negative (-) → Terminal 2	Valve moves and makes an operating noise

Text in Illustration

*1	Shift Solenoid Valve SL2

REPLACE TRANSMISSION WIRE

REPLACE SHIFT SOLENOID VALVE SL2

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