Toyota 4Runner: Do-it-yourself maintenance

Emission inspection and maintenance (I/M) programs

Some states have vehicle emission inspection programs which include OBD (On Board Diagnostics) checks. The OBD system monitors the operation of the emission control system. If the malfunction ind ...

Do-it-yourself service precautions

If you perform maintenance by yourself, be sure to follow the correct procedure as given in these sections. CAUTION The engine compartment contains many mechanisms and fluids that may move s ...

Other materials about Toyota 4Runner:

Ambient Temperature Sensor Circuit (B1412)
DESCRIPTION The cooler thermistor (ambient temperature sensor) is installed in the front part of the cooler condenser assembly. This sensor is connected to the air conditioning amplifier assembly and detects fluctuations in the ambient temperature. The se ...

Hall Effect Sensor LH (43,44)
DESCRIPTION When the automatic running board is operating and the current in the side auto step motor is within standard parameters, the side auto step controller ECU assembly halts the operation of the automatic running board if it does not receive a sid ...