AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P0748, P0778, P0798, P2810, P2819

DTC Code DTC Name
P0748 Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1)
P0778 Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2)
P0798 Pressure Control Solenoid "C" Electrical (Shift Solenoid Valve SL3)
P2810 Pressure Control Solenoid "G" Electrical (Shift Solenoid Valve SL4)
P2819 Pressure Control Solenoid "H" Electrical (Shift Solenoid Valve SL5)

DESCRIPTION

Based on the ON-OFF combinations of the shift solenoid valves SL1, 2, 3, 4 and 5, the TCM performs gear shifts from 1st gear to 8th gear.

If a circuit related to a solenoid valve is open or shorted, the TCM uses the fail-safe function to turn other solenoid valves ON or OFF. If all solenoid valves are malfunctioning, only the mechanical fluid pressure circuit will function and some manual operation will be possible. If an open or short has occurred, the TCM cuts power to the malfunctioning solenoid valve.

Tech Tips

The following table shows normal operation of the shift solenoid valves SL1, 2, 3, 4 and 5 when the shift lever is in D.

Shift Solenoid Valve Operation:
Gear 1st 2nd 3rd 4th 5th 6th 7th 8th
Shift Solenoid Valve SL1 ON ON ON ON ON OFF OFF OFF
Shift Solenoid Valve SL2 OFF OFF OFF OFF ON ON ON ON
Shift Solenoid Valve SL3 OFF OFF ON OFF OFF OFF ON OFF
Shift Solenoid Valve SL4 OFF OFF OFF ON OFF ON OFF OFF
Shift Solenoid Valve SL5 OFF ON OFF OFF OFF OFF OFF ON
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0748 Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1)

All of the following conditions are met (1 trip detection logic)


  • Driving so that gear changes occur

  • Shift solenoid valve SL1 circuit is open or shorted for 1 second

  • Shift solenoid valve SL1

  • Transmission wire

  • Harness and connector

  • TCM

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

All of the following conditions are met (1 trip detection logic)


  • Driving so that gear changes occur

  • Shift solenoid valve SL2 circuit is open or shorted for 1 second

  • Shift solenoid valve SL2

  • Transmission wire

  • Harness and connector

  • TCM

 Comes on DTC stored
P0798 Pressure Control Solenoid "C" Electrical (Shift Solenoid Valve SL3)

All of the following conditions are met (1 trip detection logic)


  • Driving so that gear changes occur

  • Shift solenoid valve SL3 circuit is open or shorted for 1 second

  • Shift solenoid valve SL3

  • Transmission wire

  • Harness and connector

  • TCM

 Comes on DTC stored
P2810 Pressure Control Solenoid "G" Electrical (Shift Solenoid Valve SL4)

All of the following conditions are met (1 trip detection logic)


  • Driving so that gear changes occur

  • Shift solenoid valve SL4 circuit is open or shorted for 1 second

  • Shift solenoid valve SL4

  • Transmission wire

  • Harness and connector

  • TCM

 Comes on DTC stored
P2819 Pressure Control Solenoid "H" Electrical (Shift Solenoid Valve SL5)

All of the following conditions are met (1 trip detection logic)


  • Driving so that gear changes occur

  • Shift solenoid valve SL5 circuit is open or shorted for 1 second

  • Shift solenoid valve SL5

  • Transmission wire

  • Harness and connector

  • TCM

 Comes on DTC stored

MONITOR DESCRIPTION

These DTCs indicate an open or short in the shift solenoid valve SL1, 2, 3, 4 and 5 circuit. The TCM 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 TCM detects the problem, illuminates the MIL and stores a DTC.

The TCM performs the fail-safe function and turns the other normal shift solenoid valves ON/OFF. In case of an open or short circuit, the TCM stops sending current to the open or short circuited solenoid.

WIRING DIAGRAM

B002DYHE07

CAUTION / NOTICE / HINT

Note

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

Click here

Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Perform the D Position Shift Test in Road Test.

    Click here

  2. Check for DTCs again.

    Click here

PROCEDURE


  1. CHECK HARNESS AND TRANSMISSION WIRE (TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1, 2, 3, 4 AND 5) - TCM)


    1. B002EBNC14
      *a

      Rear view of wire harness connector

      (to TCM)

      Disconnect the E5 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E5-6 (SL1+) - E5-5 (SL1-) 20°C (68°F) 5.0 to 5.6 Ω
      E5-4 (SL2+) - E5-14 (SL2-) 20°C (68°F) 5.0 to 5.6 Ω
      E5-26 (SL3+) - E5-25 (SL3-) 20°C (68°F) 5.0 to 5.6 Ω
      E5-17 (SL4+) - E5-16 (SL4-) 20°C (68°F) 5.0 to 5.6 Ω
      E5-3 (SL5+) - E5-10 (SL5-) 20°C (68°F) 5.0 to 5.6 Ω
      E5-6 (SL1+) or E5-5 (SL1-) - Body ground Always 10 kΩ or higher
      E5-4 (SL2+) or E5-14 (SL2-) - Body ground Always 10 kΩ or higher
      E5-26 (SL3+) or E5-25 (SL3-) - Body ground Always 10 kΩ or higher
      E5-17 (SL4+) or E5-16 (SL4-) - Body ground Always 10 kΩ or higher
      E5-3 (SL5+) or E5-10 (SL5-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  2. REPLACE TCM


    1. Replace the TCM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM A/T CODE REGISTRATION Click here

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


    1. Disconnect the E24 transmission wire connector.

    2. Disconnect the E5 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E24-23 (SL1+) - E5-6 (SL1+) Always Below 1 Ω
      E24-24 (SL1-) - E5-5 (SL1-) Always Below 1 Ω
      E24-28 (SL2+) - E5-4 (SL2+) Always Below 1 Ω
      E24-29 (SL2-) - E5-14 (SL2-) Always Below 1 Ω
      E24-25 (SL3+) - E5-26 (SL3+) Always Below 1 Ω
      E24-26 (SL3-) - E5-25 (SL3-) Always Below 1 Ω
      E24-15 (SL4+) - E5-17 (SL4+) Always Below 1 Ω
      E24-16 (SL4-) - E5-16 (SL4-) Always Below 1 Ω
      E24-5 (SL5+) - E5-3 (SL5+) Always Below 1 Ω
      E24-6 (SL5-) - E5-10 (SL5-) Always Below 1 Ω
      E24-23 (SL1+) or E5-6 (SL1+) - Body ground Always 10 kΩ or higher
      E24-24 (SL1-) or E5-5 (SL1-) - Body ground Always 10 kΩ or higher
      E24-28 (SL2+) or E5-4 (SL2+) - Body ground Always 10 kΩ or higher
      E24-29 (SL2-) or E5-14 (SL2-) - Body ground Always 10 kΩ or higher
      E24-25 (SL3+) or E5-26 (SL3+) - Body ground Always 10 kΩ or higher
      E24-26 (SL3-) or E5-25 (SL3-) - Body ground Always 10 kΩ or higher
      E24-15 (SL4+) or E5-17 (SL4+) - Body ground Always 10 kΩ or higher
      E24-16 (SL4-) or E5-16 (SL4-) - Body ground Always 10 kΩ or higher
      E24-5 (SL5+) or E5-3 (SL5+) - Body ground Always 10 kΩ or higher
      E24-6 (SL5-) or E5-10 (SL5-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - TCM)

    OK

  4. INSPECT SHIFT SOLENOID VALVE SL1, 2, 3, 4 AND 5


    1. B002E4SC46
      *a

      Component without harness connected

      (Shift Solenoid Valves SL1, 2, 3, 4 and 5)

      Remove the shift solenoid valves.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Terminal 1 of the shift solenoid valve SL1 - terminal 2 20°C (68°F) 5.0 to 5.6 Ω
      Terminal 1 of the shift solenoid valve SL2 - terminal 2 20°C (68°F) 5.0 to 5.6 Ω
      Terminal 1 of the shift solenoid valve SL3 - terminal 2 20°C (68°F) 5.0 to 5.6 Ω
      Terminal 1 of the shift solenoid valve SL4 - terminal 2 20°C (68°F) 5.0 to 5.6 Ω
      Terminal 1 of the shift solenoid valve SL5 - terminal 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 2 and a negative (-) lead to terminal 1 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 SHIFT SOLENOID VALVE Click here