TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM, Diagnostic DTC:P17A4

DTC Code DTC Name
P17A4 Automatic Disconnecting Differential Motor Limit Switch Circuit

DESCRIPTION

When the A.D.D. actuator switches between 2WD and 4WD, the DL1 and DL2 terminals of the limit switch and ADD terminal of the A.D.D. position switch change to one of the following ON/OFF combinations listed in the table below.

Terminal In 2WD Switching between 2WD and 4WD In 4WD
DL1 ON (GND) ON (GND) OFF (OPEN)
DL2 OFF (OPEN) ON (GND) ON (GND)
ADD OFF (OPEN) OFF (OPEN) ON (GND) ON (GND)

A malfunction is detected depending on the combination of the 3 circuits that make up the limit switch and A.D.D. position switch.

DTC No. Detection Item DTC Detection Condition Trouble Area
P17A4 Automatic Disconnecting Differential Motor Limit Switch Circuit

  • Diagnosis Condition: Directly after the ignition switch is turned to ON, or while switching between H2 and H4 (A.D.D. shift motor operating) with the ignition switch turned to ON

  • Malfunction Status: The ON/OFF combination of DL1, DL2 and ADD does not match the pattern

  • Malfunction Time: 0 seconds

  • Other: 1 trip detection logic

  • Wire harness and connector

  • 4 wheel drive control ECU

  • A.D.D. actuator (differential motor actuator assembly)

WIRING DIAGRAM

B0069BLE02

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - DIFFERENTIAL MOTOR ACTUATOR ASSEMBLY)


    1. Disconnect the C39 4 wheel drive control ECU connector.

    2. Disconnect the C7 A.D.D. actuator (differential motor actuator assembly) connector.

    3. w/o VSC:

      Disconnect the A3 skid control ECU (brake actuator assembly) connector.

      w/ VSC:

      Disconnect the A4 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C39-8 (DL1) - C7-6 (DL1) Always Below 1 Ω
      C39-7 (DL2) - C7-5 (DL2) Always Below 1 Ω
      C39-2 (ADD) - C7-3 (ADD) Always Below 1 Ω
      C7-4 (GND) - Body ground Always Below 1 Ω
      C39-8 (DL1) or C7-6 (DL1) - Body ground Always 10 kΩ or higher
      C39-7 (DL2) or C7-5 (DL2) - Body ground Always 10 kΩ or higher
      C39-2 (ADD) or C7-3 (ADD) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT DIFFERENTIAL MOTOR ACTUATOR ASSEMBLY (LIMIT SWITCH AND A.D.D. POSITION SWITCH)


    1. B002674C20
      *a

      Front view of wire harness connector

      (to A.D.D. Actuator (Differential Motor Actuator Assembly))

      Disconnect the C7 A.D.D. actuator (differential motor actuator assembly) connector.

    2. w/o VSC:

      Disconnect the A3 skid control ECU (brake actuator assembly) connector.

      w/ VSC:

      Disconnect the A4 skid control ECU (brake actuator assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C7-6 (DL1) - Body ground Ignition switch ON 10 to 14 V
      C7-5 (DL2) - Body ground Ignition switch ON 10 to 14 V
      C7-3 (ADD) - Body ground Ignition switch ON 10 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE DIFFERENTIAL MOTOR ACTUATOR ASSEMBLY Click here

    NG

    REPLACE 4 WHEEL DRIVE CONTROL ECU Click here