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.

DTC Code

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

 Trouble Area
P0748

  1. Driving 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. Driving 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. Driving 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. Driving 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. Driving 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 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 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

A01634XE04

INSPECTION PROCEDURE

Tech Tips

The following table shows normal operation of the shift solenoid values 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

PROCEDURE


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


    1. A015ZRFE16

      Disconnect the TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E59-6 (SL1+) - E59-5 (SL1-) 20°C (68°F) 5.0 to 5.6 Ω
      E59-4 (SL2+) - E59-14 (SL2-) 20°C (68°F) 5.0 to 5.6 Ω
      E59-26 (SL3+) - E59-25 (SL3-) 20°C (68°F) 5.0 to 5.6 Ω
      E59-17 (SL4+) - E59-16 (SL4-) 20°C (68°F) 5.0 to 5.6 Ω
      E59-3 (SL5+) - E59-10 (SL5-) 20°C (68°F) 5.0 to 5.6 Ω
      E59-6 (SL1+) or E59-5 (SL1-) - Body ground Always 10 kΩ or higher
      E59-4 (SL2+) or E59-14 (SL2-) - Body ground Always 10 kΩ or higher
      E59-26 (SL3+) or E59-25 (SL3-) - Body ground Always 10 kΩ or higher
      E59-17 (SL4+) or E59-16 (SL4-) - Body ground Always 10 kΩ or higher
      E59-3 (SL5+) or E59-10 (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. A016249E30

      Disconnect the transmission wire connector.

    2. Disconnect the TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E47-23 (SL1+) - E59-6 (SL1+) Always Below 1 Ω
      E47-24 (SL1-) - E59-5 (SL1-) Always Below 1 Ω
      E47-28 (SL2+) - E59-4 (SL2+) Always Below 1 Ω
      E47-29 (SL2-) - E59-14 (SL2-) Always Below 1 Ω
      E47-25 (SL3+) - E59-26 (SL3+) Always Below 1 Ω
      E47-26 (SL3-) - E59-25 (SL3-) Always Below 1 Ω
      E47-15 (SL4+) - E59-17 (SL4+) Always Below 1 Ω
      E47-16 (SL4-) - E59-16 (SL4-) Always Below 1 Ω
      E47-5 (SL5+) - E59-3 (SL5+) Always Below 1 Ω
      E47-6 (SL5-) - E59-10 (SL5-) Always Below 1 Ω
      E47-23 (SL1+) or E59-6 (SL1+) - Body ground Always 10 kΩ or higher
      E47-24 (SL1-) or E59-5 (SL1-) - Body ground Always 10 kΩ or higher
      E47-28 (SL2+) or E59-4 (SL2+) - Body ground Always 10 kΩ or higher
      E47-29 (SL2-) or E59-14 (SL2-) - Body ground Always 10 kΩ or higher
      E47-25 (SL3+) or E59-26 (SL3+) - Body ground Always 10 kΩ or higher
      E47-26 (SL3-) or E59-25 (SL3-) - Body ground Always 10 kΩ or higher
      E47-15 (SL4+) or E59-17 (SL4+) - Body ground Always 10 kΩ or higher
      E47-16 (SL4-) or E59-16 (SL4-) - Body ground Always 10 kΩ or higher
      E47-5 (SL5+) or E59-3 (SL5+) - Body ground Always 10 kΩ or higher
      E47-6 (SL5-) or E59-10 (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. A0161CGE11

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

      OK
      Valve moves and makes an operating sound.

    NG

    REPLACE SHIFT SOLENOID VALVE Click here

    OK

    REPAIR OR REPLACE TRANSMISSION WIRE Click here