AUTOMATIC TRANSMISSION SYSTEM (for 2KD-FTV), 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 4th is performed in combination with the on and off operation of shift solenoid valves S1 and S2, which are controlled by the TCM. If an open or short circuit occurs in either of the shift solenoid valves, the TCM controls the remaining normal shift solenoid valve to allow the vehicle to be operated safely. Also, the TCM stops sending current to the open or short-circuited solenoid Click here.

DTC Code DTC Detection Condition Trouble Area
P0973 TCM detects a short in the solenoid valve S1 circuit 4 times when solenoid valve S1 is operated (1-trip detection logic).

  • Short in shift solenoid valve S1 circuit

  • Shift solenoid valve S1

  • TCM
P0974 TCM detects an open in the solenoid valve S1 circuit 4 times when solenoid valve S1 is not operated (1-trip detection logic).

  • Open in shift solenoid valve S1 circuit

  • Shift solenoid valve S1

  • TCM

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 either shift solenoid valve circuit, the TCM detects the problem, illuminates the MIL and stores the DTC. When shift solenoid valve S1 is on, if its resistance is 8 Ω or less, the TCM determines there is a short in the shift solenoid valve S1 circuit.

When shift solenoid valve S1 is off, if its resistance is 100 kΩ or higher, the TCM determines there is an open in the shift solenoid valve S1 circuit Click here.

WIRING DIAGRAM

A01DXQVE38

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE S1)


    1. A01DZ3UE02
      Text in Illustration
      *a

      Component without harness connected

      (Transmission Wire)

      Disconnect the transmission wire connector.

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

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

    NG

    INSPECT SHIFT SOLENOID VALVE S1 Click here

    OK

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


    1. A01E22VE31
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to TCM)

      Disconnect the TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T19-18 (S1) - Body ground 20°C (68°F) 11 to 15 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE TCM

  3. INSPECT SHIFT SOLENOID VALVE S1


    1. A01DYJNE01
      Text in Illustration
      *a

      Component without harness connected

      (Shift Solenoid Valve S1)

      Remove shift solenoid valve S1.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Shift solenoid valve S1 connector terminal - Shift solenoid valve S1 body 20°C (68°F) 11 to 15 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 (+) → Shift solenoid valve S1 connector

      • Battery negative (-) → Shift solenoid valve S1 body

      		 Valve moves and makes an operating noise

    NG

    REPLACE SHIFT SOLENOID VALVE S1

    OK

    REPAIR OR REPLACE TRANSMISSION WIRE