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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 910 (Transfer Case) >> DTC/Circuit Diagnosis >> DTC P1802 - P1804, P1809: Transfer Control Unit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECTION START 

    Do you have CONSULT?

    YES or NO 

    YES: GO TO 2.

    NO: GO TO  3.

  2. PERFORM SELF-DIAGNOSIS (WITH CONSULT) 

    With CONSULT 

    1. Turn ignition switch ON. (Do not start engine.)
    2. Select SELF-DIAG RESULTS mode for ALL MODE AWD/4WD with CONSULT.
    3. Touch ERASE.
    4. Turn ignition switch OFF and wait at least 10 seconds.
    5. Perform the self-diagnosis again.

      Is the CONTROL UNIT 1 [P1802], CONTROL UNIT 2 [P1803], CONTROL UNIT 3 [P1804] or CONTROL UNIT 4 [P1809] displayed? 

      YES: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".

      NO: Inspection End.

  3. PERFORM SELF-DIAGNOSIS (WITHOUT CONSULT) 

    Without CONSULT 

    1. Perform the self-diagnosis and then erase self-diagnostic results. Refer to "CONSULT FUNCTION (ALL MODE AWD/4WD) ".
    2. Perform the self-diagnosis again.

      Do the self-diagnostic results indicate AD converter? 

      YES: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".

      NO: Inspection End.

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