AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P2769, P2770

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

DESCRIPTION

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. Detection Item DTC Detection Condition Trouble Area MIL Memory
P2769 Short in Torque Converter Clutch Solenoid Circuit (Shift Solenoid Valve SL) The ECM detects a short in the shift solenoid valve SL circuit when shift solenoid valve SL is operated (2-trip detection logic).

  • Short in shift solenoid valve SL circuit

  • Shift solenoid valve SL

  • Wiring harness connector

  • ECM

 Comes on DTC stored
P2770 Open in Torque Converter Clutch Solenoid Circuit (Shift Solenoid Valve SL) The ECM detects an open in the shift solenoid valve SL circuit when shift solenoid valve SL is not operated (2-trip detection logic).

  • Open in shift solenoid valve SL circuit

  • Shift solenoid valve SL

  • Wiring harness connector

  • ECM

 Comes on DTC stored

Fail-safe function:

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

MONITOR DESCRIPTION

Based on the signals from the throttle position sensor, air flow meter and crankshaft position sensor, the ECM sends a signal to shift solenoid valve SL to regulate the hydraulic pressure and provide smooth torque converter engagement. Shift solenoid valve SL responds to commands from the ECM. The valve controls the lock-up relay valve to perform the torque-converter lock-up function. If the ECM detects an open or short circuit for shift solenoid valve SL, it will illuminate the MIL and store the DTC.

WIRING DIAGRAM

A00YS8YE04

CAUTION / NOTICE / HINT

Note

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

Click here

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (SHIFT SOLENOID VALVE SL CIRCUIT)


    1. A00YXKNC07
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B77-3 (SL) - Body ground 20°C (68°F) 11 to 15 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (WIRING HARNESS CONNECTOR - ECM)


    1. Disconnect the B78 wiring harness connector.

    2. Disconnect the B77 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B78-6 (SL) - B77-3 (SL) Always Below 1 Ω
      B78-6 (SL) or B77-3 (SL) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL)


    1. A00YSMNC08
      *a

      Component without harness connected

      (Transmission Wire)

      Remove the wiring harness connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-6 (SL) - Body ground 20°C (68°F) 11 to 15 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE WIRING HARNESS CONNECTOR Click here

    NG

  4. INSPECT SHIFT SOLENOID VALVE SL


    1. A00YU7HC02
      *1 Shift Solenoid Valve SL

      Remove shift solenoid valve SL.

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

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

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

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

    OK

    REPLACE TRANSMISSION WIRE Click here

    NG

    REPLACE SHIFT SOLENOID VALVE SL Click here