AUTOMATIC TRANSMISSION SYSTEM (for 1KD-FTV), Diagnostic DTC:P0748

DTC Code DTC Name
P0748 Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1)

DESCRIPTION

Shifting from 1st to 5th is performed in combination with the ON and OFF operation of the shift solenoid valves SL1, SL2, S1, S2 and SR, which is controlled by the TCM. If an open or short circuit occurs in the shift solenoid valves, the TCM controls the remaining normal shift solenoid valve to allow the vehicle to be operated safely Click here.

DTC Code DTC Detection Condition Trouble Area
P0748

TCM checks for an open or short in shift solenoid valve SL1 circuit while driving and shifting between 4th and 5th gear (1 trip detection logic)

Output signal duty equal to 100%

Tech Tips

SL1 output signal duty is less than 100% under normal condition

  • Open or short in shift solenoid valve SL1 circuit

  • Shift solenoid valve SL1

  • TCM

MONITOR DESCRIPTION

This DTC indicates an open or short in the shift solenoid valve SL1 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 circuit.

While driving and shifting between 4th and 5th gears, if the TCM detects an open or short in the shift solenoid valve SL1 circuit, the TCM determines that there is a malfunction Click here.

WIRING DIAGRAM

A01E214E53

INSPECTION PROCEDURE

Tech Tips

The shift solenoid valve SL1 turns ON/OFF normally when the shift lever is on D:

TCM gear shift command 1st 2nd 3rd 4th 5th
Shift solenoid valve SL1 OFF OFF OFF OFF ON

PROCEDURE


  1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1)


    1. A01E0VEE46

      Disconnect the E1 transmission wire connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      12 (SL1+) - 4 (SL1-) 20°C (68°F) 5.0 to 5.6 Ω
      12 (SL1+) - Body ground 20°C (68°F) 10 kΩ or higher
      4 (SL1-) - Body ground 20°C (68°F) 10 kΩ or higher

    NG

    INSPECT SHIFT SOLENOID VALVE SL1 Click here

    OK

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


    1. A01E2RLE24

      Disconnect the T19 TCM connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      T19-9 (SL1+) - T19-8 (SL1-) 20°C (68°F) 5.0 to 5.6 Ω
      T19-9 (SL1+) - Body ground 20°C (68°F) 10 kΩ or higher
      T19-8 (SL1-) - Body ground 20°C (68°F) 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE TCM

  3. INSPECT SHIFT SOLENOID VALVE SL1


    1. A01E1S5E16

      Remove the shift solenoid valve SL1.

    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. Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.

      OK
      Measurement Condition Specified Condition

      • Battery positive (+) with a 21 W bulb → Terminal 1

      • Battery negative (-) → Terminal 2

      		 Valve moves and makes an operating noise

    NG

    REPLACE SHIFT SOLENOID VALVE SL1

    OK

    REPAIR OR REPLACE TRANSMISSION WIRE