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 and SR which are controlled by the ECM. If an open or short circuit occurs in one of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly ().

DTC Code

DTC Detection Condition

Trouble Area

P0778

The ECM detects an open or short in the shift solenoid valve SL2 circuit while driving and shifting gears (1 trip detection logic).

The output signal duty is 100%.

HINT:

The SL2 output signal duty is less than 100% under normal conditions.

Open or short in shift solenoid valve SL2 circuit

Shift solenoid valve SL2

ECM

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. The ECM performs the fail-safe function and turns the other normal shift solenoid valves "ON/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 ().

WIRING DIAGRAM

Dtc P0778 Pressure Control Solenoid B Electrical (Shift Solenoid Valve Sl2). A750F AUTOMATIC TRANSMISSION / TRANSAXLE. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

HINT:

The shift solenoid valve SL2 turns ON/OFF normally when the shift lever is in D.

ECM gear shift command	1st	2nd	3rd	4th	5th
Shift solenoid valve SL2	ON	ON	ON	ON	OFF

1.INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL2)

Dtc P0778 Pressure Control Solenoid B Electrical (Shift Solenoid Valve Sl2). A750F AUTOMATIC TRANSMISSION / TRANSAXLE. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the transmission wire connector.

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

Standard Resistance:
Tester Connection Condition Specified Condition
11 (SL2+) - 3 (SL2-) 20°C (68°F) 5.0 to 5.6 Ω
11 (SL2+) - Body ground Always 10 kΩ or higher
3 (SL2-) - Body ground Always 10 kΩ or higher

Text in Illustration
*a	Component without harness connected (Transmission Wire)

Go to step 3

OK

2.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

Disconnect the ECM connector.

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

Standard Resistance:
Tester Connection Condition Specified Condition
C45-12 (SL2+) - C45-13 (SL2-) 20°C (68°F) 5.0 to 5.6 Ω
C45-12 (SL2+) - Body ground Always 10 kΩ or higher
C45-13 (SL2-) - Body ground Always 10 kΩ or higher

Text in Illustration
*a	Front view of wire harness connector (to ECM)

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE ECM ()

3.INSPECT SHIFT SOLENOID VALVE SL2

Remove the shift solenoid valve SL2.

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

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

Text in Illustration
*a	Component without harness connected (Shift Solenoid Valve SL2)

REPLACE SHIFT SOLENOID VALVE SL2 ()

REPAIR OR REPLACE TRANSMISSION WIRE ()

Tester Connection	Condition	Specified Condition
11 (SL2+) - 3 (SL2-)	20°C (68°F)	5.0 to 5.6 Ω
11 (SL2+) - Body ground	Always	10 kΩ or higher
3 (SL2-) - Body ground	Always	10 kΩ or higher

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