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Problem Symptoms Table

WARNING: This page is about a different car, the 2005 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

Use the table below to help find the cause of the problem. The numbers indicate the priority of the likely cause of the problem. Check each part in order.

If necessary, replace these parts.

PROBLEM SYMPTOMS TABLE - TRANSFER CASE SYSTEM (VF4AM)

Symptom Suspected Area
Noise
  1. Oil (Level low)
  2. Oil (Wrong)
  3. Transfer faulty
Oil leakage
  1. Oil (Level too high)
  2. Gasket (Damaged)
  3. Oil seal (Worn or damaged)
  4. O-ring (Worn or damaged)
Tight corner braking Center differential or transfer faulty
Shift from 4WD (H4) to 4WD (L4) impossible
  1. Four wheel drive control switch
  2. Differential lock switch
  3. Wire harness
  4. Four wheel drive control ECU
Shift from 4WD (L4) to 4WD (H4) impossible
  1. Four wheel drive control switch
  2. Differential lock switch
  3. Wire harness
  4. Four wheel drive control ECU
Shift from 2WD (H2) to 4WD (H4) impossible
  1. Four wheel drive control switch
  2. Wire harness
  3. Four wheel drive control ECU
Shift from 4WD (H4) to 2WD (H2) impossible
  1. Four wheel drive control switch
  2. Wire harness
  3. Four wheel drive control ECU
Shift from 2WD (H2) to 4WD (L4) impossible
  1. Four wheel drive control switch
  2. Differential lock switch
  3. Wire harness
  4. Four wheel drive control ECU
Shift from 4WD (L4) to 2WD (H2) impossible
  1. Four wheel drive control switch
  2. Differential lock switch
  3. Wire harness
  4. Four wheel drive control ECU