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AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P0748

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

Changing from 1st to 6th is performed by the TCM turning shift solenoid valves SL1, SL2, SL3, SL4 and SL on and off. If an open or short circuit occurs in any of the shift solenoid valves, the TCM controls the remaining normal shift solenoid valves to allow the vehicle to be operated (Click here).

DTC Code DTC Detection Condition Trouble Area
P0748 An open or short circuit (output signal duty is 0% or 100%) is detected by the TCM in the shift solenoid valve SL1 circuit while driving and shifting between 4th and 5th gears (SL1 output signal duty is more than 0% and less than 100% under normal conditions) (1-trip detection logic).

  • Open or short in shift solenoid valve SL1 circuit

  • Shift solenoid valve SL1

  • TCM
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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 or 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. The TCM also performs the fail-safe function and turns the other normal shift solenoid valves on or 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 there is a malfunction (Click here).

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Tip:

The following table shows the normal operation of shift solenoid valve SL1 when the shift lever is in D:

TCM gear shift command 1st 2nd 3rd 4th 5th 6th
Shift solenoid valve SL1 ON ON ON ON OFF OFF
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PROCEDURE


  1. Click here

    INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1)


    1. A01ITDLE16

      Remove the TCM.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      14 (SL1+) - 13 (SL1-) 20°C (68°F) 5.0 to 5.6 Ω
      14 (SL1+) - Body ground Always 10 kΩ or higher
      13 (SL1-) - Body ground Always 10 kΩ or higher
      14 (SL1+) - All other terminals except 13 (SL1-) Always 10 kΩ or higher
      13 (SL1-) - All other terminals except 14 (SL1+) Always 10 kΩ or higher
      Table 1. Text in Illustration
      *a

      Component without TCM connected

      (Transmission Wire)

  2. Click here

    REPLACE TCMClick here

  3. Click here

    INSPECT SHIFT SOLENOID VALVE SL1


    1. A01IOMJE06

      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
      Table 2. Text in Illustration
      *a

      Component without harness connected

      (Shift Solenoid Valve SL1)

  4. Click here

    REPLACE TRANSMISSION WIREClick here

  5. Click here

    REPLACE SHIFT SOLENOID VALVE SL1Click here