AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P2769 and 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

C239278E04

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. C267934C07

      *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. C226545C08

      *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. C206832C02

      *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