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:

Disassembly
1. REMOVE LOWER BALL JOINT ASSEMBLY FRONT LH (a) Remove the cotter pin and nut. (b) Using SST(s), remove the lower ball joint assembly front LH. SST 09628-62011 2. REMOVE FRONT WHEEL BEARING DUST DEFLECTOR NO.1 LH (a) Using a screwdriver, remove the bearing dust deflector NO. 1 LH ...

Deactivating or stopping the alarm
Do one of the following to deactivate or stop the alarm: Unlock the doors using the entry function (vehicles with a smart key system) or wireless remote control. Vehicles without a smart key system: Turn the engine switch to the “ACC” or “ON” position, or start the engine. Veh ...

Problem symptoms table
HINT:  Use the table below to help determine the cause of the problem symptom. The likely causes of the problem are indicated in descending order. Check each suspected area in order. Repair or replace faulty parts or perform adjustments as necessary.  Inspect the fuse and rel ...

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