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:

Lost Communication with Back Door Power Window ECU (Abnormal Power Supply) (B2327,B2328)
DESCRIPTION DTC B2327 is stored when LIN communication between the multiplex network door ECU (back door P/W) and back door power window regulator motor assembly stops for 10 seconds or more. DTC B2328 is stored when a malfunction in the LI ...

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. ...