AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P0976, P0977

DTC Code DTC Name
P0976 Shift Solenoid "B" Control Circuit Low (Shift Solenoid Valve S2)
P0977 Shift Solenoid "B" Control Circuit High (Shift Solenoid Valve S2)

DESCRIPTION

Shifting from 1st to 5th is performed in combination with the ON and OFF operation of shift solenoid valves SL1, SL2, S1, S2 and SR, which are controlled by the TCM. If an open or short circuit occurs in one of the shift solenoid valves, the TCM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly. In the case of an open or short circuit, the TCM stops sending current to the circuit. For details, refer to the fail-safe chart.

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DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0976 Shift Solenoid "B" Control Circuit Low (Shift Solenoid Valve S2) TCM detects a short in the shift solenoid valve S2 circuit 2 times when shift solenoid valve S2 is operated (1-trip detection logic).

  • Short in shift solenoid valve S2 circuit

  • Shift solenoid valve S2

  • TCM

 Comes on DTC stored
P0977 Shift Solenoid "B" Control Circuit High (Shift Solenoid Valve S2) TCM detects an open in the shift solenoid valve S2 circuit 2 times when shift solenoid valve S2 is not operated (1-trip detection logic).

  • Open in shift solenoid valve S2 circuit

  • Shift solenoid valve S2

  • TCM

 Comes on DTC stored

MONITOR DESCRIPTION

These DTCs indicate an open or short in the shift solenoid valve S2 circuit. 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. When shift solenoid valve S2 is on, if its resistance is 8 Ω or less, the TCM determines there is a short in the shift solenoid valve S2 circuit.

When shift solenoid valve S2 is off, if its resistance is 100 kΩ or higher, the TCM determines there is an open in the shift solenoid valve S2 circuit.

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WIRING DIAGRAM

A01LCADE22
*1 Shift Solenoid Valve S2
*2 Transmission Wire

CAUTION / NOTICE / HINT

Note

Perform registration and/or initialization when parts related to the automatic transmission are replaced.

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Tech Tips


  • Shift solenoid valve S2 is turned ON/OFF normally when the shift lever is in D.

    TCM gear shift command 1st 2nd 3rd 4th 5th
    Shift solenoid valve S2 OFF ON ON OFF OFF

  • After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


    1. Perform the D Position Shift Test in Road Test.

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    2. Check for DTCs again.

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PROCEDURE


  1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE S2)


    1. A01LA0PC53
      *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
      15 (S2) - Body ground 20°C (68°F) 11 to 15 Ω
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT SHIFT SOLENOID VALVE S2 Click here

    OK

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


    1. A01LG7WC07
      *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
      C77-17 (S2) - Body ground 20°C (68°F) 11 to 15 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TCM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. INSPECT SHIFT SOLENOID VALVE S2


    1. A01SBXUC04
      *a

      Component without harness connected

      (Shift Solenoid Valve S2)

      Remove shift solenoid valve S2.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Shift solenoid valve S2 connector terminal - Shift solenoid valve S2 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 S2 connector

      • Battery negative (-) → Shift solenoid valve S2 body

      		 Valve moves and makes an operating noise
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE TRANSMISSION WIRE Click here

    NG

    REPLACE SHIFT SOLENOID VALVE S2 Click here