AUTOMATIC TRANSMISSION SYSTEM(for 2GD-FTV), 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 L4 detection switch.

This DTC indicates that the L4 detection switch remains on.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P2772 Four Wheel Drive (4WD) Low Switch Circuit Range / Performance

L4 detection switch remains on while the vehicle is being driven under the following conditions for 1.8 seconds or more (1 trip detection logic):

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

(b) Transfer position switch is in H2 or H4.

  • Short in L4 detection switch circuit

  • Skid control ECU (brake actuator assembly)

  • 4 wheel drive control ECU

  • Transfer shift actuator assembly

  • ECM

 Comes on DTC stored

MONITOR DESCRIPTION

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


WIRING DIAGRAM

B003KY3E14

CAUTION / NOTICE / HINT

Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Turn the transfer position switch to H2.

  2. Perform the D Position Shift Test in Road Test.

    Click here

  3. Check for DTCs again.

    Click here

PROCEDURE


  1. CHECK SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)


    1. B003R6XC07
      *A w/o VSC
      *B w/ VSC
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Disconnect the A68*1 or A4*2 skid control ECU (brake actuator assembly) connector.

      *1: w/o VSC

      *2: w/ VSC

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

      Standard Resistance
      w/o VSC
      Tester Connection Switch Condition Specified Condition
      A68-8 (EXI2) - Body ground Transfer position switch not L4 10 kΩ or higher
      w/ VSC
      Tester Connection Switch Condition Specified Condition
      A4-5 (EXI4) - Body ground Transfer position switch not L4 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO BRAKE CONTROL SYSTEM w/o VSC: GO TO BRAKE CONTROL SYSTEM Click here
    GO TO BRAKE CONTROL SYSTEM w/ VSC: GO TO BRAKE CONTROL SYSTEM Click here

    NG

  2. CHECK TRANSFER SHIFT ACTUATOR ASSEMBLY


    1. B003JKFC24
      *a

      Front view of wire harness connector

      (to Transfer Shift Actuator Assembly)

      Disconnect the C74 transfer shift actuator assembly connector.

    2. Disconnect the A68*1 or A4*2 skid control ECU (brake actuator assembly) connector.

      *1: w/o VSC

      *2: w/ VSC

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      C74-9 (L4) - Body ground Transfer position switch not L4 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM Click here

    NG

  3. CHECK 4 WHEEL DRIVE CONTROL ECU


    1. B003N36C10
      *a

      Front view of wire harness connector

      (to 4 Wheel Drive Control ECU)

      Disconnect the C60 4 wheel drive control ECU connector.

    2. Disconnect the C74 transfer shift actuator assembly connector.

    3. Disconnect the A68*1 or A4*2 skid control ECU (brake actuator assembly) connector.

      *1: w/o VSC

      *2: w/ VSC

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      C60-3 (4WDL) - Body ground Transfer position switch not L4 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM Click here

    NG

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY), TRANSFER SHIFT ACTUATOR ASSEMBLY, 4 WHEEL DRIVE CONTROL ECU - ECM)


    1. B003LKLC19
      *a

      Rear view of wire harness connector

      (to ECM)

      Disconnect the C41 ECM connector.

    2. Disconnect the C60 4 wheel drive control ECU connector.

    3. Disconnect the C74 transfer shift actuator assembly connector.

    4. Disconnect the A68*1 or A4*2 skid control ECU (brake actuator assembly) connector.

      *1: w/o VSC

      *2: w/ VSC

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      C41-12 (L4) - Body ground Transfer position switch not L4 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR