DTC Code | DTC Name |
---|---|
P077512 | Pressure Control Solenoid "B" Circuit Short to Battery |
DESCRIPTION
Changing gears is performed by the ECM turning the solenoid (SL1, SL2, SL3, SL4, SL5 and SL6) valves on and off.
If an open or short occurs in any of the solenoid valve circuits, the ECM controls the remaining normal solenoid valves to allow the vehicle to be driven. If all of the solenoid valves are malfunctioning, only the mechanical fluid pressure circuit will function and some manual operation will be possible. If an open or short occurs in a solenoid valve circuit, the ECM cuts power to the malfunctioning solenoid valve.
Tech Tips
The following table shows normal operation of the solenoid (SL2) valve when the shift lever is in D.
Gear | 1st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th |
---|---|---|---|---|---|---|---|---|
Solenoid (SL2) Valve | OFF | OFF | OFF | OFF | ON | ON | ON | ON |
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
---|---|---|---|---|---|---|
P077512 | Pressure Control Solenoid "B" Circuit Short to Battery | While the vehicle is being driven so that gear changes occur, a short to +B is detected in the solenoid (SL2) valve circuit for 1 second (1-trip detection logic). |
|
Comes on | DTC stored | SAE Code: P0967 |
MONITOR DESCRIPTION
This DTC indicates a short to +B in the solenoid (SL2) valve circuit. The ECM commands gear shifts by turning the solenoid valves on or off. When there is an open or short in any solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores a DTC.
The ECM performs the fail-safe function and turns the other normal solenoid valves on or off. In the case of an open or short circuit, the ECM stops sending current to the open or shorted solenoid.
CONFIRMATION DRIVING PATTERN
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Tech Tips
After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for 2 minutes or more.
Turn the engine switch on (IG) and turn the GTS on.
Start the engine.
Perform the D Position Shift Test inspection in Road Test.
Stop the vehicle.
Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
Input the DTC: P077512.
Check the DTC judgment result.
GTS Display | Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
Tech Tips
If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.
WIRING DIAGRAM
*a | Solenoid (SL2) Valve |
*b | Transmission Wire |
CAUTION / NOTICE / HINT
Note
Perform registration and/or initialization when parts related to the automatic transaxle are replaced.
PROCEDURE
CHECK HARNESS AND TRANSMISSION WIRE (TRANSMISSION WIRE (SOLENOID (SL2) VALVE) - ECM)
Disconnect the D110 ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) Click here |
OK |
REPLACE ECM
Replace the ECM.
Result | ||
---|---|---|
|
NEXT |
PERFORM REGISTRATION Click here |
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
Disconnect the D75 transmission wire connector.
Disconnect the D110 ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM) |
OK |
INSPECT SOLENOID (SL2) VALVE
*a | Component without harness connected (Solenoid (SL2) Valve) |
Remove the solenoid (SL2) valve.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Connect a positive (+) lead from the battery with a 21 W bulb to terminal 1 and a negative (-) lead to terminal 2 of the solenoid valve connector. Check that the valve moves and makes an operating sound.
OK |
---|
Valve moves and makes an operating sound. |
Result | |||
---|---|---|---|
|
OK |
REPAIR OR REPLACE TRANSMISSION WIRE Click here |
NG |
REPLACE SOLENOID (SL2) VALVE Click here |