2013 Toyota 4Runner TrailFACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

HINT: 

  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.
TRANSFER SYSTEM

Symptom Suspected Area See
Switch from 2WD (H2) to 4WD (H4) is impossible Transfer indicator switch (for 4WD position) Refer to INSPECTION
Transfer shift actuator assembly Refer to INSPECTION 
Harness or connector Refer to SYSTEM DIAGRAM 
ECM Refer to TERMINALS OF ECM
Four wheel drive control ECU Refer to TERMINALS OF ECU 
Switch from 4WD (H4) to 2WD (H2) is impossible Transfer indicator switch (for 4WD position) Refer to INSPECTION
Transfer shift actuator assembly Refer to INSPECTION 
Harness or connector Refer to SYSTEM DIAGRAM 
ECM Refer to TERMINALS OF ECM
Four wheel drive control ECU Refer to TERMINALS OF ECU 
Switch from 4WD (H4) to 4WD (L4) is impossible Transfer indicator switch (for 4WD position) Refer to INSPECTION
Transfer indicator switch (for L4 position) Refer to INSPECTION
Transfer shift actuator assembly Refer to INSPECTION 
Harness or connector Refer to SYSTEM DIAGRAM 
ECM Refer to TERMINALS OF ECM
Switch from 4WD (L4) to 4WD (H4) is impossible Transfer indicator switch (for 4WD position) Refer to INSPECTION
Transfer indicator switch (for L4 position) Refer to INSPECTION
Transfer shift actuator assembly Refer to INSPECTION 
Harness or connector Refer to SYSTEM DIAGRAM 
ECM Refer to TERMINALS OF ECM
4WD indicator light does not come on Harness or connector Refer to SYSTEM DIAGRAM 
Combination meter assembly Refer to PROBLEM SYMPTOMS TABLE
CAN communication system Refer to DIAGNOSIS SYSTEM
Four wheel drive control ECU Refer to TERMINALS OF ECU 
Transfer indicator switch (for 4WD position) Refer to INSPECTION
Transfer shift actuator assembly Refer to INSPECTION 
4WD indicator light remains on Four wheel drive control ECU Refer to TERMINALS OF ECU 
Transfer indicator switch (for 4WD position) Refer to INSPECTION
Combination meter assembly Refer to PROBLEM SYMPTOMS TABLE
4LO indicator light does not come on Harness or connector Refer to SYSTEM DIAGRAM 
Combination meter assembly Refer to PROBLEM SYMPTOMS TABLE
CAN communication system Refer to DIAGNOSIS SYSTEM
Four wheel drive control ECU Refer to TERMINALS OF ECU 
Transfer indicator switch (for L4 position) Refer to INSPECTION
Transfer shift actuator assembly Refer to INSPECTION 
4LO indicator light does not come on Four wheel drive control ECU Refer to TERMINALS OF ECU 
Transfer indicator switch (for 4WD position) Refer to INSPECTION
Combination meter assembly Refer to PROBLEM SYMPTOMS TABLE
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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