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DIFFERENTIAL SYSTEM(w/ Differential Lock), Diagnostic DTC:P17BB

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DTC Code DTC Name
P17BB Rear Differential Lock Position SW Stuck OFF
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DESCRIPTION

This DTC is output when an OFF malfunction of the rear differential lock position switch (No. 1 transfer indicator switch) is detected.

DTC No. Detection Item DTC Detection Condition Trouble Area
P17BB Rear Differential Lock Position SW Stuck OFF

  • Diagnosis Condition: With ignition switch turned to ON, rear differential is locked (differential lock coil operating)

  • Malfunction Status: With vehicle speed 5 km/h or higher, rear differential lock position switch (No. 1 transfer indicator switch) is stuck OFF

  • Malfunction Time: 3 seconds or more

  • Other: 1 trip detection logic

  • Wire harness and connector

  • 4 wheel drive control ECU

  • Rear differential lock position switch (No. 1 transfer indicator switch)
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Tip:

except Pre-Runner:

When the rear differential lock position switch (transfer indicator switch) is stuck OFF, if the transfer is set to H2, the vehicle is stopped and the ignition switch is turned from off to ON, the system returns to normal and this DTC is stored as a past DTC.

If the transfer is set to L4 again, the rear differential is locked and the vehicle is driven at 5 km/h or more, this DTC is output again.

for Pre-Runner:

When the rear differential lock position switch (transfer indicator switch) is stuck OFF, the vehicle is stopped and the ignition switch is turned from off to ON, the system returns to normal and this DTC is stored as a past DTC.

If the rear differential is locked and the vehicle is driven at 5 km/h or more, this DTC is output again.

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PROCEDURE


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    CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - NO. 1 TRANSFER INDICATOR SWITCH)


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

    2. Disconnect the F2 rear differential lock position switch (No. 1 transfer indicator switch) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C39-12 (SLS) - F2-2 (RLY2) Always Below 1 Ω
      F2-1 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    CHECK 4 WHEEL DRIVE CONTROL ECU (ECU OUTPUT VOLTAGE)


    1. B00256JC02
      *a

      Front view of wire harness connector

      (to Rear Differential Lock Position Switch (No. 1 Transfer Indicator Switch))

      Disconnect the F2 rear differential lock position switch (No. 1 transfer indicator switch) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F2-2 (RLY2) - Body ground Ignition switch ON 10 to 14 V
      Result
      Proceed to
      OK
      NG

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    CHECK NO. 1 TRANSFER INDICATOR SWITCH


    1. for Automatic Transmission:

      Move the shift lever to N.

      for Manual Transmission:

      Move the shift lever to neutral.

    2. except Pre-Runner:

      Switch the transfer position switch to L4.

    3. Lift up the vehicle until all four wheels are off the ground.

    4. Release the parking brake.

    5. Operate the differential lock switch to switch to locked.

      Tip:

      The rear differential lock indicator light continues to blink.

    6. Rotate one rear wheel in both directions and set the rear differential to the locked condition.

      Tip:

      When the rear differential is locked, rotating one rear wheel causes the other rear wheel to rotate in the same direction.

    7. B0028GZC02
      *a

      Component with harness connected

      (4 Wheel Drive Control ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C39-12 (SLS) - Body ground Rear differential in locked condition Below 1.5 V
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE 4 WHEEL DRIVE CONTROL ECUClick here

    • NG

      REPLACE NO. 1 TRANSFER INDICATOR SWITCH w/ Differential Lock:Click here

      REPLACE NO. 1 TRANSFER INDICATOR SWITCH for DANA Made w/ Differential Lock:Click here