AUTOMATIC TRANSMISSION SYSTEM (for 3UR-FE), Diagnostic DTC:P0979, P0980

DTC Code DTC Name
P0979 Shift Solenoid "C" Control Circuit Low (Shift Solenoid Valve S3)
P0980 Shift Solenoid "C" Control Circuit High (Shift Solenoid Valve S3)

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 shift solenoid valve Click here.

DTC Code DTC Detection Condition Trouble Area
P0979 The ECM detects a short in the shift solenoid valve S3 circuit 2 times when shift solenoid valve S3 is operated (1 trip detection logic).
  • Short in shift solenoid valve S3 circuit

  • Shift solenoid valve S3

  • ECM

P0980 The ECM detects an open in the shift solenoid valve S3 circuit 2 times when shift solenoid valve S3 is not operated (1 trip detection logic).
  • Open in shift solenoid valve S3 circuit

  • Shift solenoid valve S3

  • ECM

MONITOR DESCRIPTION

These DTCs indicate an open or short in the shift solenoid valve S3 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 S3 is ON, if its resistance is 8 Ω or less, the ECM determines there is a short in the shift solenoid valve S3 circuit.

When shift solenoid valve S3 is OFF, if its resistance is 100 kΩ or higher, the ECM determines there is an open in the shift solenoid valve S3 circuit Click here.

WIRING DIAGRAM

A01ENF6E11

INSPECTION PROCEDURE

Tech Tips

Shift solenoid valve S3 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 S3 ON ON ON OFF OFF OFF

PROCEDURE


  1. INSPECT NO. 1 TRANSMISSION WIRE (SHIFT SOLENOID VALVE S3)


    1. A01EPLNE35
      Text in Illustration
      *a

      Component without harness connected

      (No. 1 Transmission Wire)

      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
      7 (S3) - Body ground 20°C (68°F) 11 to 15 Ω

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

    A01ERYUE93
    Text in Illustration
    *1 for LHD
    *2 for RHD
    *a

    Front view of wire harness connector

    (to ECM)


    1. Disconnect the ECM connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      C53-3 (S3) - Body ground 20°C (68°F) 11 to 15 Ω
      for RHD
      Tester Connection Condition Specified Condition
      C54-3 (S3) - Body ground 20°C (68°F) 11 to 15 Ω

    NG
    OK
  3. INSPECT SHIFT SOLENOID VALVE S3


    1. A01ENREE05
      Text in Illustration
      *a

      Component without harness connected

      (Shift Solenoid Valve S3)

      Remove shift solenoid valve S3.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Shift solenoid valve S3 connector terminal - Shift solenoid valve S3 body 20°C (68°F) 11 to 15 Ω
    3. Apply battery voltage (12 V) 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 S3 connector

      • Battery negative (-) → Shift solenoid valve S3 body

      Valve moves and makes an operating noise

    NG
    OK