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.
Differential System

Symptom

Suspected Area

See page

Oil leakage from front differential

Oil (Level too high or wrong grade)


Front differential rear oil seal (Worn or damaged)


Companion flange (Loose or damaged)


Oil leakage from rear differential

Oil (Level too high or wrong grade)


Rear differential front oil seal (Worn or damaged)


Companion flange (Loose or damaged)


Oil leak from front drive pinion shaft

Oil (Level too high or wrong grade)


Front differential oil seal (Worn or damaged)


Companion flange (Loose or damaged)


Oil leak from rear drive pinion shaft

Oil (Level too high or wrong grade)


Rear differential oil seal (Worn or damaged)


Companion flange (Loose or damaged)


Differential lock does not operate

Rear differential lock switch


Four wheel drive control ECU


Differential carrier (Faulty)

-

Wiring or ground (Faulty)

-

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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Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART HINT: If a trouble code is output during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See page" below. *: The air conditioning amplifier stor ...

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