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Home >> Toyota >> 2006 >> Tundra Base, 4.0 U, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Transfer Case) >> Troubleshooting >> Problem Symptoms Table

Problem Symptoms Table

WARNING: This page is about a different variant/trim than selected.

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 SYSTEM

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)
Shift from 2WD to 4WD (4HI) impossible
  1. 4WD fuse
  2. Wire harness
  3. 2WD/4HI switch
  4. Vehicle speed sensor
  5. 4WD position switch
  6. 4HI indicator light
  7. Actuator assembly
  8. A.D.D. control system
  9. 4WD control ECU
  10. Transfer assembly
Shift from 4WD (4HI) to 4WD (4LO) impossible
  1. 4LO switch
  2. Vehicle speed sensor
  3. L4 position switch
  4. Park/neutral position switch
  5. 4LO indicator switch
  6. Actuator assembly
  7. Wire harness
  8. 4WD control ECU
Shift from 4WD (4HI) to 2WD impossible
  1. 4WD fuse
  2. Wire harness
  3. 2WD/4HI switch
  4. Vehicle speed sensor
  5. 4WD position switch
  6. 4HI indicator light
  7. Actuator assembly
  8. A.D.D. control system
  9. 4WD control ECU
  10. Transfer assembly
shift from 4WD (4LO) to 4WD (4HI) impossible
  1. 4LO switch
  2. Vehicle speed sensor
  3. L4 position switch
  4. Park/neutral position switch
  5. 4LO indicator switch
  6. Actuator assembly
  7. Wire harness
  8. 4WD control ECU