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

for Preparation Click here


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 (Click here).

DTC Code
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)
Output signal duty ratio equals 100%

HINT:
SL2 output signal duty is less than 100% under normal condition.
  1. Open or short in shift solenoid valve SL2 circuit
  2. Shift solenoid valve SL2
  3. 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. Then 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 (Click here).

MONITOR STRATEGY


Related DTCs
P0778: Shift solenoid valve SL2/Range check
Required sensors/Components
Shift solenoid valve SL2
Frequency of operation
Continuous
Duration
1 sec.
MIL operation
Immediately
Sequence of operation
None

TYPICAL ENABLING CONDITIONS


The monitor will run whenever the following DTCs are not present
None
Ignition switch
ON
Starter
OFF
Solenoid current cut status
Not cut
Battery voltage
11 V or more

TYPICAL MALFUNCTION THRESHOLDS


Solenoid status from MIC
Failure

COMPONENT OPERATING RANGE


Output signal duty
Less than 100%

WIRING DIAGRAM


C161203E02


INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs (Click here).

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


    C159421E03
  1. Disconnect the D63 transmission wire connector.

  1. 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


NG
Go to step 3
OK


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


    C159422E08
  1. Disconnect the D74 ECM connector.

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

    Standard resistance:
    Tester Connection
    Condition
    Specified Condition
    D74-12 (SL2+) - D74-13 (SL2-)
    20°C (68°F)
    5.0 to 5.6 Ω
    D74-12 (SL2+) - Body ground
    Always
    10 kΩ or higher
    D74-13 (SL2-) - Body ground
    Always
    10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Click here)  

3.INSPECT SHIFT SOLENOID VALVE SL2


    C151311E17
  1. Remove shift solenoid valve SL2.

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

    Standard resistance:
    Tester Connection
    Condition
    Specified Condition
    Terminal 1 of shift solenoid valve SL2 - terminal 2
    20°C (68°F)
    5.0 to 5.6 Ω
  1. Connect the battery's positive (+) lead with a 21 W bulb to terminal 1 and the negative (-) lead to terminal 2 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.

    OK:
    Valve moves and makes an operating noise.


NG
REPLACE SHIFT SOLENOID VALVE SL2 (Click here)
OK

REPAIR OR REPLACE TRANSMISSION WIRE (Click here)