AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P079514

DTC Code DTC Name
P079514 Pressure Control Solenoid "C" Circuit Short to Ground or Open

DESCRIPTION

Based on the ON-OFF combinations of the solenoid (SL1, SL2, SL3, SL4, SL5, SL6, SC1, SC2, SC3 and SR) valves, the ECM performs gear shifts from 1st gear to 10th gear.

If a circuit related to a solenoid valve is open or shorted, the ECM uses the fail-safe function to turn other solenoid valves ON or OFF. If an open or short has occurred, the ECM cuts power to the malfunctioning solenoid valve.

Tech Tips

The following table shows normal operation of the solenoid (SL3) valve when the shift state is in drive (D).

Solenoid Valve Operation:
Gear Solenoid (SL3) Valve
1st OFF
2nd OFF
3rd OFF
4th OFF
5th OFF
6th OFF
7th ON
8th ON
9th ON
10th ON
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P079514 Pressure Control Solenoid "C" Circuit Short to Ground or Open Solenoid (SL3) valve circuit current is lower than specified value for the target current continuously for 1 second or more while driving with gear changes (1-trip detection logic).

  • Harness and connector

  • Transmission wire

  • Solenoid (SL3) valve

  • ECM

 Comes on DTC stored SAE: P0970

MONITOR DESCRIPTION

This DTC indicates an open or short in the solenoid (SL3) 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 case of an open or short circuit, the ECM stops sending current to the open or shorted solenoid.

CONFIRMATION DRIVING PATTERN

Tech Tips

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the engine switch off and wait for at least 30 seconds.

  5. Turn the engine switch on (IG) and turn the GTS on.

  6. Perform the D Position Shift Test inspection in Road Test.

    Click here

  7. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.

  8. Input the DTC: P079514.

  9. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    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

Refer to DTC P079512.

Click here

CAUTION / NOTICE / HINT

Note

Perform registration and/or initialization when parts related to the automatic transmission are replaced.

Click here

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE (SOLENOID (SL3) VALVE) - ECM)


    1. B000VELC21
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G42-14 (SL3+) - G42-15 (SL3-) 20°C (68°F) 5.0 to 5.6 Ω
      G42-14 (SL3+) or G42-15 (SL3-) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) Click here

    OK

  2. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM A/T CODE REGISTRATION Click here

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


    1. Disconnect the G2 transmission wire connector.

    2. Disconnect the G42 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G2-13 (SL3+) - G42-14 (SL3+) Always Below 1 Ω
      G2-14 (SL3-) - G42-15 (SL3-) Always Below 1 Ω
      G2-13 (SL3+) or G42-14 (SL3+) - Body ground and other terminals Always 10 kΩ or higher
      G2-14 (SL3-) or G42-15 (SL3-) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT SOLENOID (SL3) VALVE


    1. B000YFQC19
      *1 Solenoid (SL3) Valve

      Remove the solenoid (SL3) valve.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 5.0 to 5.6 Ω

    3. 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
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE TRANSMISSION WIRE Click here

    NG

    REPLACE SOLENOID (SL3) VALVE Click here