Transfer Case Diagnosis - Torque On-Demand

• Application
• Description
  • Transfer Case
• Operation
  • Tod Control System
  • System Components
    • Speed Sensors
    • Electromagnetic Coil
    • Multi-Plate Disc Clutch Pack
    • Mechanical Lock Sleeve
    • High-Low Planetary Gear Set
    • 4H/4L Switches
    • Electronic Control Unit (ECU)
    • TOD Indicator Light
• Trouble Shooting
  • Symptom Diagnosis
    • Tight Corner Braking Is Observed When Vehicle Is Subject To Full Steering
    • 4WD Mode Not Active With 4WD Switch On
    • 4WD System Drive Resistance Is Too Large To Get Sufficient Running Speed
    • Shift-On-The-Fly System Generates Gear Noises
    • Braking Distance Too Long Even With ABS Active
• Self-Diagnostics
  • Retrieving Diagnostic Trouble Codes (DTC)
  • Clearing Diagnostic Trouble Codes (DTC)
  • INTERMITTENTS
  • Road Test Of Failed Vehicle
  • Tod Control Unit Check
• Diagnostic Tests
  • Notes
  • DTC 13 & 15: Reference Circuit Shorted To Ground Or Power
  • DTC 14: Front Speed Sensor Open Or Shorted
  • DTC 16: Front Speed Sensor Has No Running Speed Pulse
  • DTC 21: Throttle Position (TP) Sensor Has Faulty Voltage
  • DTC 23, 36, 37 & 38: Ecu Failure
  • DTC 24: Rear Speed Sensor Open Or Shorted
  • DTC 25 & 35: Check Light Is Shorted To Power Or To Ground
  • DTC 26: Electromagnetic Coil Shorted To Ground
  • DTC 27: Front Speed Sensor Has No Pulse
  • DTC 28: Front Hub Does Not Shift Between 2WD & 4WD
  • DTC 31: Electromagnetic Coil Is Faulty
  • DTC 32: Front Hub On/Off Signal Broken Or Shorted To Power
  • DTC 33: ADC Circuit Shorted To Ground
  • DTC 34: Diesel/Gas I.D. Signal Is Faulty
• Fault Diagnosis From Tod Indicator
  • Notes
  • All Tod Indicator Lights & Check Light Are Lit, & Go Off Momentarily At 2-Second Intervals
  • Tod Indicator Status Does Not Change When Transfer Lever Is Shifted From Tod To 2H
  • Check Light Is On When Transfer Lever Is Shifted From 2H To Tod
  • When Transfer Lever Is Shifted From 4L To Tod, 4L Mode Remains On & Tod Mode Is Displayed
  • Indicator Light Status Does Not Change When Transfer Lever Is Shifted From 4L
  • Tod Mode Is Displayed With Transfer Lever In 4L Position
  • 4L Mode Is Displayed With Transfer Lever In 2H Or Tod Mode
  • Indicator Lights Are Flashing, Tod & 4L Modes Are Disabled
  • Check Light Is Flashing, 2WD Mode Not Enabled With 4WD Switch In 2WD Position
  • Check Light Continues Flashing Irregularly
  • Indicator Brightness Does Not Change Even With Light Switch Off
• Symptom Tests
  • Test A: Tight Corner Braking Is Observed When Vehicle Is Subject To Full Steering Or 4WD System Drive Resistance Is Too Large To Get Sufficient Running Speed
  • Test B: 4WD Mode Is Not Active With 4WD Switch On
  • Test C: Shift-On-The-Fly System Generates Gear Noises
  • Test D: Braking Distance Too Long Even With Abs Active
  • General Diagnosis
• Removal & Installation
• Wiring Diagrams