Toyota Fortuner. Dtc P2716/77 Pressure Control Solenoid D Electrical (Shift Solenoid Valve Slt)

INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SLT)

CHECK WIRE HARNESS (SHIFT SOLENOID VALVE SLT - TCM)

DTC P2716/77 Pressure Control Solenoid "D" Electrical (Shift Solenoid Valve SLT)

DESCRIPTION

The throttle pressure that is applied to the primary regulator valve (which modulates the line pressure) causes the solenoid valve SLT, under electronic control, to precisely modulate and generate the line pressure according to the extent that the accelerator pedal is depressed or the output of engine power.
This controls the line pressure and provides smooth shifting characteristics.
Upon receiving a signal of the throttle valve opening angle, the TCM controls the line pressure by sending a predetermined duty ratio* to the solenoid valve, modulating the line pressure and generating throttle pressure.

HINT:

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.A340E Automatic Transmission.Automatic Transmission System.
Dtc
P2716/77 Pressure Control Solenoid D Electrical (Shift Solenoid Valve Slt)

*: The duty ratio is the ratio of the current on time (A) to the total of the current on and off time (A + B).

Duty Ratio (%) = A / (A + B) x 100

DTC Code	DTC Detection Condition	Trouble Area
P2716/77	TCM detects shift solenoid valve SLT circuit malfunction for 1 sec. or more (1 trip detection logic)	Open or short in shift solenoid valve SLT circuit Shift solenoid valve SLT TCM

WIRING DIAGRAM

INSPECTION PROCEDURE

1.INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SLT)

Disconnect the E1 wire connector.

Measure the resistance of the transmission wire.
Standard Resistance:
Tester Connection
Condition
Specified Condition
2 (SLT+) - 6 (SLT-)
20°C (68°F)
5.0 to 5.6 Ω
2 (SLT+) - Body ground
Always
10 kΩ or higher
6 (SLT-) - Body ground
Always
10 kΩ or higher

Go to step 3

OK

2.CHECK WIRE HARNESS (SHIFT SOLENOID VALVE SLT - TCM)

Disconnect the T19 TCM connector.

Measure the resistance of the wire harness side connector.
Standard Resistance:
Tester Connection
Condition
Specified Condition
T19-20 (SLT+) - T19-19 (SLT-)
20°C (68°F)
5.0 to 5.6 Ω
T19-20 (SLT+) - Body ground
Always
10 kΩ or higher
T19-19 (SLT-) - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE TCM

3.INSPECT SHIFT SOLENOID VALVE SLT

Remove the shift solenoid valve SLT.

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

Connect the battery's positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.
OK:
Valve moves and makes an operating noise.

HINT:

Reference: Inspection using an oscilloscope.
Check the waveform of the TCM connector.
OK:
Refer to illustration
Item
Content
Tester Connection
T19-20 (SLT+) - T19-19 (SLT-)
Tool Setting
5 V/DIV., 1 msec./DIV.
Condition
Engine is idling

REPLACE SHIFT SOLENOID VALVE SLT

REPLACE TRANSMISSION WIRE

Tester Connection	Condition	Specified Condition
2 (SLT+) - 6 (SLT-)	20°C (68°F)	5.0 to 5.6 Ω
2 (SLT+) - Body ground	Always	10 kΩ or higher
6 (SLT-) - Body ground	Always	10 kΩ or higher

Item	Content
Tester Connection	T19-20 (SLT+) - T19-19 (SLT-)
Tool Setting	5 V/DIV., 1 msec./DIV.
Condition	Engine is idling