AUTOMATIC TRANSMISSION SYSTEM (for 1KD-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 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 TCM. If an open or short circuit occurs in the shift solenoid valves, the TCM controls the remaining normal shift solenoid valve to allow the vehicle to be operated safely Click here.

DTC Code DTC Detection Condition Trouble Area
P0973 TCM 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

  • TCM
P0974 TCM 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

  • 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 any shift solenoid valve circuit, the TCM 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 TCM 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 TCM determines that there is an open in the shift solenoid valve S1 circuit Click here.

WIRING DIAGRAM

A01E07GE50

INSPECTION PROCEDURE

Tech Tips

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

TCM 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. A01E0VEE48

      Disconnect the E1 transmission wire connector.

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

      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 HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM)


    1. A01E2RLE27

      Disconnect the T19 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. A01DZVZE01

      Remove the 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