AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P0748

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

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.

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DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0748 Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1) 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

 Comes on DTC stored

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 a 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 gear, if the TCM detects an open or short in the shift solenoid valve SL1 circuit, the TCM determines there is a malfunction.

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WIRING DIAGRAM

A002ALQE33
*1 Shift Solenoid Valve SL1
*2 Transaxle Assembly

CAUTION / NOTICE / HINT

Tech Tips

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

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

PROCEDURE


  1. INSPECT TRANSMISSION WIRE (SL1)


    1. A002C2RC12
      *a

      Component without harness connected

      (Transmission Wire)

      Remove the TCM from the transaxle.

    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 and other terminals Always 10 kΩ or higher
      13 (SL1-) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TCM Click here

    NG

  2. INSPECT SHIFT SOLENOID VALVE SL1


    1. A0029G2C02
      *1 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. 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.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TRANSMISSION WIRE Click here

    NG

    REPLACE SHIFT SOLENOID VALVE SL1 Click here