СИСТЕМА АВТОМАТИЧЕСКОЙ ТРАНСМИССИИ, Diagnostic DTC:P2769, P2770

DTC Code DTC Name
P2769 Torque Converter Clutch Solenoid Circuit Low (Shift Solenoid Valve SL)
P2770 Torque Converter Clutch Solenoid Circuit High (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 the operation of the lock-up clutch.

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

  • Short in shift solenoid valve SL circuit

  • Shift solenoid valve SL

  • ECM
P2770 The ECM detects an open in the shift solenoid valve SL circuit (once) when shift solenoid valve SL is not operated (2-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 shift solenoid valve SL OFF.

MONITOR DESCRIPTION

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

WIRING DIAGRAM

A003I9ME06

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL)


    1. A003DSGE13
      Text in Illustration
      *a

      Component without harness connected

      (Transmission Wire)

      Disconnect the transmission wire connector.

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

      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 HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)


    1. A003BS9E08
      Text in Illustration
      *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
      D97-61 (SL) - Body ground 20°C (68°F) 11 to 15 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM

  3. INSPECT SHIFT SOLENOID VALVE SL


    1. A003B8NE01
      Text in Illustration
      *a

      Component without harness connected

      (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

    NG

    REPLACE SHIFT SOLENOID VALVE SL

    OK

    REPAIR OR REPLACE TRANSMISSION WIRE