Toyota RAV4 manuals

Toyota Sienna Service Manual: General information

A large number of ECU controlled systems are used in the SIENNA. In general, ECU controlled systems are considered to be very intricate, requiring a high level of technical knowledge to troubleshoot. However, most problem checking procedures only involve inspecting the ECU controlled system's circuits one by one. An adequate understanding of the system and a basic knowledge of electricity is enough to perform effective troubleshooting, accurate diagnoses and necessary repairs.

FOR USING INTELLIGENT TESTER

(1)If communication is normal when the tester is connected to another vehicle, inspect the diagnosis data link line (Bus (+) line) or ECU power circuit of the vehicle.

(2)If communication is still not possible when the tester is connected to another vehicle, the problem is probably in the tester itself. Perform the Self Test procedures outlined in the tester operator's manual.

How to troubleshoot ecu controlled systems
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Electronic circuit inspection procedure
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Other materials:

Inspection
1. V (a) Inspect VSV operation. (1) Using an ohmmeter, measure the resistance according to the value(s) in the table below.V Standard resistance If the result is not as specified, replace the vsv. (B) inspect the vsv for ground. (1) Using an ohmmeter, measure the resistance accordin ...

Bulb locations
Front Vehicles without daytime running lights or with bulb type daytime running lights Headlight high beam and daytime running lights (if equipped) Headlight low beam (halogen bulb) Fog light (if equipped) Front turn signal/parking and front side marker lights Vehic ...

Front Fog Light Circuit
DESCRIPTION The Multiplex network body ECU controls FOG relay when signal is received from headlight dimmer switch assembly. WIRING DIAGRAM INSPECTION PROCEDURE 1 PERFORM ACTIVE TEST BY INTELLIGENT TESTER Connect the intelligent tester to DLC3. Turn the ignition switch ON and push t ...

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