Toyota 4Runner manuals

Toyota 4Runner: Problem Symptoms Table

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 page

Noise

Oil (Level low)


Oil (Wrong)


Transfer faulty


Oil leakage

Oil (Level too high)


Gasket (Damaged)


Oil seal (Worn or damaged)


O-ring (Worn or damaged)


Hard to shift or does not shift

Shifting key spring (Damaged)


Synchronizer spring (Worn or damaged)


4WD indicator light does not come on

Harness or connector


Combination meter


CAN communication system


Four wheel drive control ECU


Transfer indicator switch (for 4WD position)


4WD indicator light remains on

Four wheel drive control ECU


Transfer indicator switch (for 4WD position)


Combination meter


Shift from 2WD (H2) to 4WD (H4) is impossible

Transfer indicator switch (for 4WD position)


A.D.D. actuator


Harness or connector


ECM


Four wheel drive control ECU


Shift from 4WD (H4) to 2WD (H2) is impossible

Transfer indicator switch (for 4WD position)


A.D.D. actuator


Harness or connector


ECM


Four wheel drive control ECU


Shift from 4WD (H4) to 4WD (L4) is impossible

Transfer indicator switch (for 4WD position)


Transfer indicator switch (for L4 position)


Transfer indicator switch (for neutral position)


Harness or connector


ECM


Shift from 4WD (L4) to 4WD (H4) is impossible

Transfer indicator switch (for 4WD position)


Transfer indicator switch (for L4 position)


Transfer indicator switch (for neutral position)


Harness or connector


ECM


System Diagram
SYSTEM DIAGRAM ...

Terminals Of Ecu
TERMINALS OF ECU 1. CHECK 4WD CONTROL ECU (a) Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color ...

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How To Proceed With Troubleshooting
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