DTC P0778: Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2): Procedure

WARNING: This page is about a different car, the 2010 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT TRANSMISSION WIRE (SL2)

Remove the TCM from the transaxle.

Fig 1: Inspecting Transmission Wire (SL2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection	Specified Condition 20°C (68°F)
9 (SL2+) - 8 (SL2-)	5.0 to 5.6 Ω

Measure the resistance according to the value(s) in the table below.

Standard resistance

Check for short

Tester Connection	Specified Condition
9 (SL2+) - Body ground	10 kΩ or higher
8 (SL2-) - Body ground	10 kΩ or higher

OK → REPLACE TCM

NG: Go to next step

INSPECT SHIFT SOLENOID SL2

Remove the shift solenoid valve SL2.

Fig 2: Identifying Shift Solenoid Valve SL2
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection	Specified Condition 20°C (68°F)
1 - 2	5.0 to 5.6 Ω

Connect a positive (+) lead through a 21 W bulb to terminal 2 and a negative (-) lead to terminal 1 of the solenoid valve connector, then check the movement of the valve.
OK

The solenoid makes an operating sound.

NG → REPLACE SHIFT SOLENOID SL2

OK → REPAIR OR REPLACE TRANSMISSION WIRE