AUTOMATIC TRANSMISSION SYSTEM(for 1GD-FTV), Diagnostic DTC:P2774

DTC Code DTC Name
P2774 Four Wheel Drive (4WD) Low Switch Circuit High

DESCRIPTION

The ECM detects the signal from the L4 detection switch.

This DTC indicates that the L4 detection switch remains off.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P2774 Four Wheel Drive (4WD) Low Switch Circuit High

L4 detection switch remains off 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 L4.

  • Open in L4 detection switch circuit

  • 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 H4 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

Refer to DTC P2773.

Click here

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 L4.

  2. Drive the vehicle at 15 to 20 km/h (9 to 12 mph) for 1.8 seconds or more.

  3. Check for DTCs again.

    Click here

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (TRANSFER SHIFT ACTUATOR ASSEMBLY - ECM)


    1. Disconnect the C41 transfer shift actuator assembly connector.

    2. Disconnect the C60 ECM connector

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      C41-9 (L4) - C60-12 (L4) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK TRANSFER SHIFT ACTUATOR ASSEMBLY (TRANSFER SHIFT ACTUATOR ASSEMBLY - BODY GROUND)


    1. B0068IQC44
      *a

      Front view of wire harness connector

      (to Transfer Shift Actuator Assembly)

      Disconnect the transfer shift actuator assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      C41-10 (GND) - Body ground Aways Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT TRANSFER SHIFT ACTUATOR ASSEMBLY


    1. Inspect the transfer shift actuator assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPLACE TRANSFER SHIFT ACTUATOR ASSEMBLY Click here