P0778

U760E AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: P0778: Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2)
P0778 - Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2)

DESCRIPTION

Changing from 1st to 6th is performed by the ECM turning shift solenoid valves SL1, SL2, SL3, SL4 and SL 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 Fail-Safe Chart.





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 Fail-Safe Chart.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All





Condition (A)





Condition (B)





Condition (C)





TYPICAL MALFUNCTION THRESHOLDS

When one of the following conditions is met: Condition (A), (B) or (C)

Condition (A) and (B)





Condition (C)





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
The following table shows normal operation of the shift solenoid valve SL2 when the shift lever is in D:





PROCEDURE

1. CHECK HARNESS AND CONNECTOR (SHIFT SOLENOID VALVE SL2 CIRCUIT)

(a) Disconnect the ECM connector.





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

Standard Resistance:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (ECM - WIRING HARNESS CONNECTOR)

OK -- REPLACE ECM Components

2. CHECK HARNESS AND CONNECTOR (ECM - WIRING HARNESS CONNECTOR)

(a) Disconnect the harness connector from the wiring harness connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT TRANSMISSION WIRE (SL2)

(a) Remove the wiring harness connector from the transaxle.





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

Standard Resistance:





Text in Illustration





NG -- INSPECT SHIFT SOLENOID VALVE SL2

OK -- REPLACE WIRING HARNESS CONNECTOR Components

4. INSPECT SHIFT SOLENOID VALVE SL2

(a) Remove shift solenoid valve SL2.





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

Standard Resistance:





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

OK:

Valve moves and makes an operating sound.

Text in Illustration





NG -- REPLACE SHIFT SOLENOID VALVE SL2 Components

OK -- REPLACE TRANSMISSION WIRE Components