Automatic Transmission - U660E

U660E 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 TCM 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 TCM controls the remaining normal shift solenoid valves to allow the vehicle to be operated .





MONITOR DESCRIPTION

This DTC indicates an open or short in the shift solenoid valve SL2 circuit. The TCM 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 TCM detects the problem and illuminates the MIL and stores the DTC. The TCM 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 TCM stops sending current to the circuit.)

While driving and shifting gears, if the TCM detects an open or short in the shift solenoid valve SL2 circuit, the TCM determines there is a malfunction .

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All

All:

Condition (A)

Condition (A):

Condition (B)

Condition (B):

Condition (C)

Condition (C):

TYPICAL MALFUNCTION THRESHOLDS

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

Condition (A) and (B)

Condition (A) and (B):

Condition (C)

Condition (C):

COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs .

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





PROCEDURE

1. INSPECT TRANSMISSION WIRE (SL2)

(a) Remove the TCM from the transaxle.





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

Standard Resistance:





Result:





B -- REPLACE TCM
A -- Continue to next step.

2. 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:





Text in Illustration

Text in Illustration:

(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.

NG -- REPLACE SHIFT SOLENOID VALVE SL2

OK -- REPAIR OR REPLACE TRANSMISSION WIRE