ELECTRONIC CONTROLLED AUTOMATIC TRANSMISSION SYSTEM (for 1GR-FE), Diagnostic DTC:P0973, P0974

DTC Code DTC Name
P0973 Shift Solenoid "A" Control Circuit Low (Shift Solenoid Valve S1)
P0974 Shift Solenoid "A" Control Circuit High (Shift Solenoid Valve S1)

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 ECM. If an open or short circuit occurs in the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be operated safely Click here.

DTC No. DTC Detection Condition Trouble Area
P0973 ECM detects short in solenoid valve S1 circuit 2 times when solenoid valve S1 is operated (1 trip detection logic)

  • Short in shift solenoid valve S1 circuit

  • Shift solenoid valve S1

  • ECM
P0974 ECM detects open in solenoid valve S1 circuit 2 times when solenoid valve S1 is not operated (1 trip detection logic)

  • Open in shift solenoid valve S1 circuit

  • Shift solenoid valve S1

  • ECM

MONITOR DESCRIPTION

These DTCs indicate an open or short in the shift solenoid valve S1 circuit. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores the DTC. When the shift solenoid valve S1 is ON, if resistance is 8 Ω or less, the ECM determines that there is a short in the shift solenoid valve S1 circuit.

When the shift solenoid valve S1 is OFF, if resistance is 100 kΩ or more, the ECM determines that there is an open in the shift solenoid valve S1 circuit Click here.

WIRING DIAGRAM

A01E0F3E01

INSPECTION PROCEDURE

Tech Tips

The shift solenoid valve S1 turns ON/OFF normally when the shift lever is on D:

ECM gear shift command 1st 2nd 3rd 4th 5th
Shift solenoid valve S1 ON ON OFF OFF OFF

PROCEDURE


  1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE S1)


    1. A01E2ZME25

      Disconnect the E1 wire connector.

    2. Measure the resistance of the wire connector.

      Standard resistance
      Tester Connection Condition Specified Condition
      8 - Body ground 20°C (68°F) 11 to 15 Ω

    NG

    INSPECT SHIFT SOLENOID VALVE S1 Click here

    OK

  2. CHECK WIRE HARNESS (TRANSMISSION WIRE - ECM)


    1. A01E0X8E05

      Disconnect the E16 ECM connector.

    2. Measure the resistance of the wire harness side connector.

      Standard resistance
      Tester Connection Condition Specified Condition
      E16-11 (S1) - Body ground 20°C (68°F) 11 to 15 Ω

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM

  3. INSPECT SHIFT SOLENOID VALVE S1


    1. A01DWR3E01

      Remove the shift solenoid valve S1.

    2. Measure the resistance of the solenoid valve.

      Standard resistance
      5.0 to 5.6 Ωat 20°C (68°F)

    3. Connect the battery's positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body.

    4. Check the operating noise of the solenoid valve.

      OK
      Solenoid makes operating noise.

    NG

    REPLACE SHIFT SOLENOID VALVE S1

    OK

    REPAIR OR REPLACE TRANSMISSION WIRE