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AUTOMATIC TRANSMISSION SYSTEM (for 3UR-FE), Diagnostic DTC:P0976, P0977

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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)
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DESCRIPTION

Shifting from 1st to 6th is performed in combination with ON and OFF operation of shift solenoid valves SL1, SL2, S1, S2, S3, S4 and SR, which are controlled by the ECM. If an open or short circuit occurs in any of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated safely. Also, the ECM stops sending the current to the open or short circuited solenoid (Click here).

DTC Code DTC Detection Condition Trouble Area
P0976 ECM detects a short in the solenoid valve S2 circuit 2 times when solenoid valve S2 is operated (1 trip detection logic).

  • Short in shift solenoid valve S2 circuit

  • Shift solenoid valve S2

  • ECM
P0977 ECM detects an open in the solenoid valve S2 circuit 2 times when solenoid valve S2 is not operated (1 trip detection logic).

  • Open in shift solenoid valve S2 circuit

  • Shift solenoid valve S2

  • ECM
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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 ECM 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 ECM 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 more, the ECM determines there is an open in the shift solenoid valve S2 circuit (Click here).

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Tip:

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

ECM gear shift command 1st 2nd 3rd 4th 5th 6th
Shift solenoid valve S2 ON ON OFF OFF OFF ON
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PROCEDURE


  1. Click here

    INSPECT NO. 1 TRANSMISSION WIRE (SHIFT SOLENOID VALVE S2)


    1. A015739E34

      Disconnect the No. 1 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
      Table 1. Text in Illustration
      *a

      Component without harness connected

      (No. 1 Transmission Wire)

  2. Click here

    CHECK HARNESS AND CONNECTOR (NO. 1 TRANSMISSION WIRE - ECM)


    1. A015CW9E22

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C45-6 (S2) - Body ground 20°C (68°F) 11 to 15 Ω
      Table 2. Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

  3. Click here

    INSPECT SHIFT SOLENOID VALVE S2


    1. A0156LHE03

      Remove the shift solenoid valve S2.

    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
      Table 3. Text in Illustration
      *a

      Component without harness connected

      (Shift Solenoid Valve S2)

  4. Click here

    REPAIR OR REPLACE NO. 1 TRANSMISSION WIREClick here

  5. Click here

    REPLACE ECMClick here

  6. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. Click here

    REPLACE SHIFT SOLENOID VALVE S2Click here