Dtc Detection Condition

DTC No.

DTC Detection Condition

Trouble Area

P0778

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

(NOTE: SL2 output signal duty is less than 100 % under normal condition.)

• 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. Also, 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 between 4th and 5th gears, if the ECM detects an open or short in the shift solenoid valve SL2 circuit, the ECM determines that there is a malfunction (See DATA LIST / ACTIVE TEST ).

monitor strategy MONITOR STRATEGY

2006 TRANSMISSION A750E Automatic Transaxle - Sequoia

Related DTCs

P0778: Shift solenoid valve SL2/Range check

Required sensors/Components

Shift solenoid valve SL2

Frequency of operation

Continuous

Duration

1 second

MIL operation

Immediate

Sequence of operation

None

typical enabling conditions TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present.

None

Battery voltage

10 V or more

CPU commanded duty

Less than 75 %

Ignition switch

ON

Starter

OFF

typical malfunction thresholds TYPICAL MALFUNCTION THRESHOLDS

Output signal duty

component operating range COMPONENT OPERATING RANGE

Output signal duty

Less than 100 %

wiring diagram wiring diagram

Obd Code P0778 Toyota

2006 TRANSMISSION A750E Automatic Transaxle - Sequoia

Fig. 59: DTC P0778 Pressure Control Solenoid "B" Electrical - Wiring Diagram Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HINT:

The shift solenoid valve SL2 turns ON/OFF normally when the shift lever is in the D position: GEAR POSITION

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)

a. Disconnect the E1 transmission wire connector.

b. Measure the resistance.

Standard resistance

TESTER CONNECTIO

N AND SPECIFIED CONDIT

Tester Connection

Specified Condition

11 (SL2+) - 3 (SL2-)

5.0 to 5.6 ohms at 20°C (68°F)

11 (SL2+) - Body ground

10 kohms or higher

23 (SL2-) - Body ground

10 kohms or higher

OK: GO TO NEXT STEP.

2006 TRANSMISSION A750E Automatic Transaxle - Sequoia

P0778 Toyota Avalon
Fig. 60: Identifying El Transmission Wire Connector Terminals Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

a. Connect the E1 transmission wire connector.

b. Disconnect the E7 ECM connector.

c. Measure the resistance.

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection

Specified Condition

2006 TRANSMISSION A750E Automatic Transaxle - Sequoia

E7-17 (SL2+) - E7-16 (SL2-)

5.0 to 5.6 ohms at 20°C (68°F)

E7-17 (SL2+) - Body ground

10 kohms or higher

E7-16 (SL2-) - Body ground

10 kohms or higher

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