Toyota Sienna Service Manual: How to troubleshoot ecu controlled systems

Vehicle lift and support locations

1. NOTICE ABOUT VEHICLE CONDITION WHEN JACKING UP VEHICLE (a) The vehicle must be unloaded before jacking up/ lifting up the vehicle. Never jack up/lift up a heavily loaded vehicle. (b) When re ...

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 troubleshoo ...

Other materials:

How to proceed with troubleshooting
The intelligent tester can be used at step 2, 5, 8, 11. 1 Vehicle Brought to Workshop 2 Check and Clear DTCs and Freeze Frame Data HINT: See page BC-82 and BC-84. 3 Problem Symptom Confirmation 4 Symptom Simulation 5 DTC Check HINT: See page BC-82. 6 Problem Symptoms Table HINT: ...

Disassembly
1. HOLD VANE PUMP ASSEMBLY (a) Using SST, hold the vane pump assembly in a vise. SST 09630-00014 (09631-00132) 2. REMOVE POWER STEERING SUCTION PORT UNION (a) Remove the bolt and the power steering suction port union from the vane pump front housing. (b) Using a screwdriver, remove ...

CD cannot be Inserted / Played or CD is Ejected Right After Insertion
INSPECTION PROCEDURE 1 CHECK IF A PROPER CD IS INSERTED Make sure that the CD is an audio CD or a CD with an MP3 or WMA file, and that it is not deformed, flawed, stained, burred, or otherwise defective. OK: Normal CD. HINT:  Translucent or uniquely-shaped CDs cannot be play ...