AUTOMATIC TRANSMISSION SYSTEM(for 1UR-FE), Diagnostic DTC:P2772

DTC Code DTC Name
P2772 Four Wheel Drive (4WD) Low Switch Circuit Range / Performance

DESCRIPTION

The ECM detects the signal from the transfer L4 position switch.

This DTC indicates that the transfer L4 position switch remains on.

DTC Code DTC Detection Condition Trouble Area
P2772

The transfer L4 position switch remains on while the vehicle is running under the following conditions for 1.8 sec. or more (1 trip detection logic).

(a) The output shaft speed is between 1000 and 3000 rpm.

(b) The transfer position switch is in H4.

  • Short in transfer L4 position switch circuit

  • 4 wheel drive control ECU

  • ECM

MONITOR DESCRIPTION

The ECM monitors the transfer-case L4 position switch to determine when the transfer-case L4 gears are engaged. If the L4 switch indicates that the transfer-case L4 gears remain engaged under the following conditions, the ECM will conclude that there is a malfunction of the L4 position switch, illuminate the MIL and store the DTC:


WIRING DIAGRAM

A01XA0JE11

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - BODY GROUND)


    1. A01X90IE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to 4 Wheel Drive Control ECU)

      Disconnect the 4 wheel drive control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A27-16 (L4) - Body ground Always 10 kΩ or higher

    OK

    GO TO TRANSFER SYSTEM INSPECTION Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - ECM)


    1. A01XAS7E01
      Text in Illustration
      *1 for LHD
      *2 for RHD
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

    2. Disconnect the A27 4 wheel drive control ECU connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A38-21 (L4) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A52-21 (L4) - Body ground Always 10 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR