AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P2769/64, P2770/64

DTC Code DTC Name
P2769/64 Short in Torque Converter Clutch Solenoid Circuit (Shift Solenoid Valve SL)
P2770/64 Open in Torque Converter Clutch Solenoid Circuit (Shift Solenoid Valve SL)

DESCRIPTION

The shift solenoid valve SL is turned ON and OFF by signals from the ECM to control the hydraulic pressure acting on the lock-up relay valve, which then controls operation of the lock-up clutch.

DTC No. DTC Detection Condition Trouble Area
P2769/64 ECM detects short in shift solenoid valve SL circuit (once) when shift solenoid valve SL is operated (1 trip detection logic)

  • Short in shift solenoid valve SL circuit

  • Shift solenoid valve SL

  • ECM
P2770/64 ECM detects open in shift solenoid valve SL circuit (once) when shift solenoid valve SL is not operated (1 trip detection logic)

  • Open in shift solenoid valve SL circuit

  • Shift solenoid valve SL

  • ECM

Fail-safe function:

If the ECM detects a malfunction, it turns the shift solenoid valve SL OFF.

MONITOR DESCRIPTION

Torque converter lock-up is controlled by the ECM based on engine rpm, engine load, engine temperature, vehicle speed, transmission temperature, and shift position selection. The ECM determines the lock-up status of the torque converter by comparing the engine rpm (NE) to the input rpm (NC0). The ECM calculates the actual transmission gear by comparing the input rpm (NC0) to the output rpm (SP2). When conditions are appropriate, the ECM requests "lock-up" by applying control voltage to the shift solenoid valve SL. When the shift solenoid valve SL is opened, the shift solenoid valve SL applies pressure to the lock-up relay valve and locks the torque converter clutch. If the ECM detects an open or short in the shift solenoid valve SL circuit, the ECM interprets this as a fault in the shift solenoid valve SL or its circuit. The ECM will illuminate the MIL and store a DTC.

WIRING DIAGRAM

A01J4ETE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL)


    1. A01J7O1E09

      Disconnect the E1 wire connector.

    2. Measure the resistance of the transmission wire.

      Standard resistance
      Tester Connection Condition Specified Condition
      7 (SL) - Body ground 20°C (68°F) 11 to 15 Ω

    NG

    INSPECT SHIFT SOLENOID VALVE SL Click here

    OK

  2. CHECK WIRE HARNESS (TRANSMISSION WIRE - ECM)


    1. A01J4OSE05

      Disconnect the E10 ECM connector.

    2. Measure the resistance of the wire harness side connector.

      Standard resistance
      Tester Connection Condition Specified Condition
      E10-11 (SL) - Body ground 20°C (68°F) 11 to 15 Ω

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM

  3. INSPECT SHIFT SOLENOID VALVE SL


    1. A01J70RE01

      Remove the shift solenoid valve SL.

    2. Measure the resistance between the solenoid valve terminal and solenoid valve body.

      Standard resistance
      11 to 15 Ωat 20°C (68°F)

    3. Connect the battery's positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body.

    4. Check the operating noise of the solenoid valve.

      OK
      Solenoid makes operating noise.

    NG

    REPLACE SHIFT SOLENOID VALVE SL

    OK

    REPAIR OR REPLACE TRANSMISSION WIRE