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.
|
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) |
- |
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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
...
Other materials about Toyota 4Runner:
PTC Heater Circuit
DESCRIPTION
PTC heater relays are closed in accordance with signals from the air conditioning
amplifier assembly and power is supplied to the quick heater assembly installed
on the radiator heater unit.
WIRING DIAGRAM
PROCEDURE
1.
...
Center Airbag Sensor Assembly Communication Circuit Malfunction (B1790)
DESCRIPTION
The center airbag sensor communication circuit consists of the occupant classification
ECU and center airbag sensor.
DTC B1790 is stored when a malfunction is detected in the center airbag sensor
communication circuit.
DTC Code
...
0.1068