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Home >> Subaru >> 2021 >> Forester Base >> Repair and Diagnosis >> Drivelines & Axles >> Differentials & Drive Axles >> Rear Differential Inspection Mode >> Procedure
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Rear Differential Inspection Mode: Procedure

CAUTION:
  • When replacing transmission main body, front differential hypoid gear set, transfer driven gear, rear differential, rear differential hypoid gear set, perform rear differential inspection mode.
  • Do not turn the power of the Subaru Select Monitor OFF during work, and do not disconnect the data link connector.
  1. Shift the select lever to "P range".
  2. Apply the parking brake.
  3. Lift up the vehicle.
    CAUTION:
    • Lift up the vehicle until the tire bottom is 0.3 m (0.98 ft) or more above the ground.
    • Make sure that safety is secured where the Tires rotate.
  4. Connect the Subaru Select Monitor.
  5. Turn the ignition switch to ON. (Engine OFF)
  6. On [Start] screen, select [Diagnosis].
  7. On [Vehicle selection] screen, enter vehicle information and select [Set].
  8. On [Main Menu] screen, select [Each System].
  9. On [Select System] screen, select [Transmission Control System].
  10. On [Select Function] screen, select [Work Support].
  11. On [Work Support] screen, select [Rear differential inspection mode].
  12. Follow the messages displayed on the screen when working.
  13. The results of the rear differential inspection mode are displayed on the screen.
    • When ended normally:

      [The rear differential has been replaced normally. Front-rear rotation ratio &STR01]

    • When ended abnormally:

      [A rear differential abnormality has been detected. Reinspect the items at the time of rear differential installation. Front-rear rotation ratio &STR01]

    • When interrupted:

      [Inspection is stopped. Restart this inspection mode from the beginning.]

  14. When [Please be IGOFF in a safe state] appears, the rear differential inspection mode completes.
    NOTE:
    • When the rear differential inspection mode is completed properly, the warning light of VDC, ABS, engine, power steering or EyeSight may illuminate. But this is not a malfunction.

      If warning light illuminates, clear the memory.

    • If the rear differential inspection mode does not end normally, repeat the mode until it ends normally.
    • When the inspection mode does not end normally, the AWD warning light will start blinking at 2 Hz.
    • When the rear differential inspection mode ends abnormally, the front differential and rear differential may be different from the specifications for the vehicle.
    • When the rear differential inspection mode is interrupted, the following reasons are possible.
    Message Main reasons for abnormal termination Action to take
    • [Inspection is stopped.]
    • [Inspection is stopped. Restart this inspection mode from the beginning.]
    		 TCM has detected a failure. Perform the diagnosis for TCM.
    Ref. to TRANSMISSION (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .
    VDC has a failure. Perform the diagnosis for VDC. Ref. to BRAKE CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .
    Brake is applied after start during automatic running. -
    Too delayed operation to the instructions displayed on the Subaru Select Monitor. -
    [TCM incompatible. Rear differential inspection mode is stopped.] The model does not support the rear differential inspection mode. Check the specifications.
    [The TCM has detected a fault. Inspect following the service information.] TCM has detected a failure. Perform the diagnosis for TCM. Ref. to TRANSMISSION (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .
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