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 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 the system will change to a manual transmission. If an open or short has occurred, the TCM cuts power to the malfunctioning solenoid valve.

DTC Code

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

 Trouble Area
P0748

  1. Vehicle is driven so that gear changes occur

  2. Solenoid valve SL1 circuit is open or shorted

  3. 1 second

  4. 1 trip detection logic

  • Shift solenoid valve SL1

  • Transmission wire

  • Harness and connector

  • TCM
P0778

  1. Vehicle is driven so that gear changes occur

  2. Solenoid valve SL2 circuit is open or shorted

  3. 1 second

  4. 1 trip detection logic

  • Shift solenoid valve SL2

  • Transmission wire

  • Harness and connector

  • TCM
P0798

  1. Vehicle is driven so that gear changes occur

  2. Solenoid valve SL3 circuit is open or shorted

  3. 1 second

  4. 1 trip detection logic

  • Shift solenoid valve SL3

  • Transmission wire

  • Harness and connector

  • TCM
P2810

  1. Vehicle is driven so that gear changes occur

  2. Solenoid valve SL4 circuit is open or shorted

  3. 1 second

  4. 1 trip detection logic

  • Shift solenoid valve SL4

  • Transmission wire

  • Harness and connector

  • TCM
P2819

  1. Vehicle is driven so that gear changes occur

  2. Solenoid valve SL5 circuit is open or shorted

  3. 1 second

  4. 1 trip detection logic

  • Shift solenoid valve SL5

  • Transmission wire

  • Harness and connector

  • TCM

MONITOR DESCRIPTION

These DTCs indicate an open or short in the shift solenoid valve SL1, 2, 3, 4 or 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 the DTC. Also, 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

A01GIE0E01

INSPECTION PROCEDURE

Tech Tips

Shift solenoid valves SL1, 2, 3, 4 and 5 turn on/off normally when the shift lever is in D.

Shift Solenoid Valve Operation:
Gear Position 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

PROCEDURE


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


    1. A01GKKHE02

      Disconnect the E6 and E7 TCM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E6-6 (SL1+) - E6-5 (SL1-) Always 5.0 to 5.6 Ω
      E6-4 (SL2+) - E6-3 (SL2-) Always 5.0 to 5.6 Ω
      E6-2 (SL3+) - E6-1 (SL3-) Always 5.0 to 5.6 Ω
      E7-7 (SL4+) - E7-6 (SL4-) Always 5.0 to 5.6 Ω
      E7-5 (SL5+) - E7-4 (SL5-) Always 5.0 to 5.6 Ω
      E6-6 (SL1+) or E6-5 (SL1-) - Body ground Always 10 kΩ or higher
      E6-4 (SL2+) or E6-3 (SL2-) - Body ground Always 10 kΩ or higher
      E6-2 (SL3+) or E6-1 (SL3-) - Body ground Always 10 kΩ or higher
      E7-7 (SL4+) or E7-6 (SL4-) - Body ground Always 10 kΩ or higher
      E7-5 (SL5+) or E7-4 (SL5-) - Body ground Always 10 kΩ or higher

    NG

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

    OK

  2. REPLACE TCM


    1. Replace the TCM Click here.


    NEXT

    PERFORM A/T CODE REGISTRATION Click here

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


    1. A01GJVWE02

      Disconnect the E50 transmission wire connector.

    2. Disconnect the E6 and E7 TCM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E50-23 (SL1+) - E6-6 (SL1+) Always Below 1 Ω
      E50-24 (SL1-) - E6-5 (SL1-) Always Below 1 Ω
      E50-28 (SL2+) - E6-4 (SL2+) Always Below 1 Ω
      E50-29 (SL2-) - E6-3 (SL2-) Always Below 1 Ω
      E50-25 (SL3+) - E6-2 (SL3+) Always Below 1 Ω
      E50-26 (SL3-) - E6-1 (SL3-) Always Below 1 Ω
      E50-15 (SL4+) - E7-7 (SL4+) Always Below 1 Ω
      E50-16 (SL4-) - E7-6 (SL4-) Always Below 1 Ω
      E50-5 (SL5+) - E7-5 (SL5+) Always Below 1 Ω
      E50-6 (SL5-) - E7-4 (SL5-) Always Below 1 Ω
      E50-23 (SL1+) or E6-6 (SL1+) - Body ground Always 10 kΩ or higher
      E50-24 (SL1-) or E6-5 (SL1-) - Body ground Always 10 kΩ or higher
      E50-28 (SL2+) or E6-4 (SL2+) - Body ground Always 10 kΩ or higher
      E50-29 (SL2-) or E6-3 (SL2-) - Body ground Always 10 kΩ or higher
      E50-25 (SL3+) or E6-2 (SL3+) - Body ground Always 10 kΩ or higher
      E50-26 (SL3-) or E6-1 (SL3-) - Body ground Always 10 kΩ or higher
      E50-15 (SL4+) or E7-7 (SL4+) - Body ground Always 10 kΩ or higher
      E50-16 (SL4-) or E7-6 (SL4-) - Body ground Always 10 kΩ or higher
      E50-5 (SL5+) or E7-5 (SL5+) - Body ground Always 10 kΩ or higher
      E50-6 (SL5-) or E7-4 (SL5-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01GNU1E11

      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 shift solenoid valve SL1 - Terminal 2 20°C (68°F) 5.0 to 5.6 Ω
      Terminal 1 of shift solenoid valve SL2 - Terminal 2 20°C (68°F) 5.0 to 5.6 Ω
      Terminal 1 of shift solenoid valve SL3 - Terminal 2 20°C (68°F) 5.0 to 5.6 Ω
      Terminal 1 of shift solenoid valve SL4 - Terminal 2 20°C (68°F) 5.0 to 5.6 Ω
      Terminal 1 of shift solenoid valve SL5 - Terminal 2 20°C (68°F) 5.0 to 5.6 Ω

    3. Connect the battery's positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.

      OK
      Valve moves and makes operating noise.

    NG

    REPLACE SHIFT SOLENOID VALVE Click here

    OK

    REPAIR OR REPLACE TRANSMISSION WIRE Click here