AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P2769, P2770

DTC Code DTC Name
P2769 Torque Converter Clutch Solenoid Circuit Low (Shift Solenoid Valve DSL)
P2770 Torque Converter Clutch Solenoid Circuit High (Shift Solenoid Valve DSL)

DESCRIPTION

Shift solenoid valve DSL 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 Code DTC Detection Condition Trouble Area
P2769 The ECM detects a short in the shift solenoid valve DSL circuit when shift solenoid valve DSL is operated (2 trip detection logic).
  • Short in shift solenoid valve DSL circuit

  • Shift solenoid valve DSL

  • ECM

P2770 The ECM detects an open in the shift solenoid valve DSL circuit when shift solenoid valve DSL is not operated (2 trip detection logic).
  • Open in shift solenoid valve DSL circuit

  • Shift solenoid valve DSL

  • ECM

Fail-safe function:

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

MONITOR DESCRIPTION

Torque converter clutch lock-up is controlled by the ECM based on the engine speed, engine load, engine temperature, vehicle speed, transaxle temperature, and shift position selection. The ECM determines the lock-up status of the torque converter clutch by comparing the engine speed (NE) to the input turbine rpm (NT). The ECM calculates the actual transaxle gear by comparing the input turbine rpm (NT) to the counter gear rpm (NC). When conditions are appropriate, the ECM requests lock-up by applying control voltage to shift solenoid valve DSL. When shift solenoid valve DSL is opened, shift solenoid valve DSL 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 DSL circuit, the ECM interprets this as a fault in shift solenoid valve DSL or its circuit. Then the ECM illuminates the MIL and stores a DTC.

WIRING DIAGRAM

A0057QXE01
*a Shift Solenoid Valve DSL
*b Transmission Wire

PROCEDURE


  1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE DSL)


    1. A0055R6E02
      Text in Illustration
      *1

      Component without harness connected

      (Transmission Wire)

      Disconnect the B19 transmission wire connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (DSL) - Body ground 20°C (68°F) 11 to 13 Ω

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


    1. A005441E02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

      Disconnect the B39 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B39-56 (DSL) - Body ground 20°C (68°F) 11 to 13 Ω

    OK
    NG
  3. INSPECT SHIFT SOLENOID VALVE DSL


    1. A005364E01
      Text in Illustration
      *1

      Component without harness connected

      (Shift Solenoid Valve DSL)

      Remove shift solenoid valve DSL.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Shift solenoid valve DSL connector terminal - Shift solenoid valve DSL body 20°C (68°F) 11 to 13 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 DSL connector

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

      Valve moves and makes an operating noise

    OK
    NG