AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P0748

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

DESCRIPTION

Shifting from 1st to 4th is performed in combination with the ON and OFF operation of shift solenoid valves SL1, SL2 and S4, which are controlled by the ECM. If an open or short circuit occurs in any of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated safely Click here.

DTC Code DTC Detection Condition Trouble Area
P0748 The duty cycle to shift solenoid valve SL1 is 100% (1 trip detection logic).

  • Open or short in shift solenoid valve SL1 circuit

  • Shift solenoid valve SL1

  • ECM

MONITOR DESCRIPTION

This DTC indicates an open or short in the shift solenoid valve SL1 circuit. The ECM 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 ECM detects the problem, illuminates the MIL and stores the DTC. Also, the ECM performs the fail-safe function and turns the other normal shift solenoid valves ON/OFF. In case of an open or short circuit, the ECM stops sending current to the circuit Click here.

WIRING DIAGRAM

A0052T7E01
*a Shift Solenoid Valve SL1
*b Transmission Wire

PROCEDURE


  1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1)


    1. A0055R6E15
      Text in Illustration
      *1

      Component without harness connected

      (Transmission Wire)

      Disconnect the B19 transmission wire connector.

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

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

    NG

    INSPECT SHIFT SOLENOID VALVE SL1 Click here

    OK

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


    1. A0056D7E02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

      Disconnect the B39 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B39-61 (SL1+) - B39-60 (SL1-) 20°C (68°F) 5.0 to 5.6 Ω
      B39-61 (SL1+) - Body ground Always 10 kΩ or higher
      B39-60 (SL1-) - Body ground Always 10 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. INSPECT SHIFT SOLENOID VALVE SL1


    1. A0054M6E01
      Text in Illustration
      *1

      Component without harness connected

      (Shift Solenoid Valve SL1)

      Remove 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

    OK

    REPAIR OR REPLACE TRANSMISSION WIRE Click here

    NG

    REPLACE SHIFT SOLENOID VALVE SL1 Click here