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 |
Tech Tips The SL2 output signal duty is less than 100% under normal conditions. |
|
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 Click here.
WIRING DIAGRAM
INSPECTION PROCEDURE
Tech Tips
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 |
PROCEDURE
INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL2)
*a | Component without harness connected (Transmission Wire) |
Disconnect the transmission wire connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
INSPECT SHIFT SOLENOID VALVE SL2 Click here |
OK |
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
*a | Front view of wire harness connector (to ECM) |
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
REPLACE ECM Click here
INSPECT SHIFT SOLENOID VALVE SL2
*a | Component without harness connected (Shift Solenoid Valve SL2) |
Remove the shift solenoid valve SL2.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.
OK | ||||
---|---|---|---|---|
|
NG |
REPLACE SHIFT SOLENOID VALVE SL2 Click here |
OK |
REPAIR OR REPLACE TRANSMISSION WIRE Click here