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)
Hard to shift or does not shift	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

Problem Symptoms Table