AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P0976 and 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 6th is performed in combination with the 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 current to the open or short-circuited solenoid (Click here).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

P0976

Shift Solenoid "B" Control Circuit Low (Shift Solenoid Valve S2)

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

Comes on

DTC stored

P0977

Shift Solenoid "B" Control Circuit High (Shift Solenoid Valve S2)

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

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

WIRING DIAGRAM

C220890E09

CAUTION / NOTICE / HINT

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

PROCEDURE

  1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE S2)

    1. C210154C05

      *a

      Component without harness connected

      (Transmission Wire)

      Disconnect the C24 transmission wire connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      20 (S2) - Body ground

      20°C (68°F)

      11 to 15 Ω

      Result

      Result

      OK

      NG
    NG

    INSPECT SHIFT SOLENOID VALVE S2Click here

    OK

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

    1. C214335C03

      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the C28 ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      C28-31 (S2) - Body ground

      20°C (68°F)

      11 to 15 Ω

      Result

      Result

      OK

      NG
    OK

    REPLACE ECM

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. INSPECT SHIFT SOLENOID VALVE S2

    1. C208650C01

      *a

      Component without harness connected

      (Shift Solenoid Valve S2)

      Remove 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

      Result

      Result

      OK

      NG
    OK

    REPAIR OR REPLACE TRANSMISSION WIRE

    Click here

    NG

    REPLACE SHIFT SOLENOID VALVE S2

    Click here