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:

Removal
1. Disconnect cable from negative battery terminal 2. REMOVE HEATED OXYGEN SENSOR (for Bank 1 Sensor 2) (See page EC-32) 3. REMOVE TAIL EXHAUST PIPE ASSEMBLY (a) Remove the 2 bolts. (b) Disconnect the 3 exhaust pipe supports and remove the tail exhaust pipe assembly. (c) Remove the gas ...

Folding down the third seats (manual seats)
Before folding the third seats Fold the outside head restraints and lower the center head restraint to the lowest position , and stow the seat belt buckles. Stow the center seat belt. Folding down the third seatbacks Pull the “TO FOLD/LIFT SEATBACK” strap a Return ...

DTC check / clear
1. CHECK DTC (USING INTELLIGENT TESTER)  Checking DTCs.  Connect the intelligent tester to the DLC3.  Turn the ignition switch ON.  Read DTCs by following the prompts on the tester screen. HINT: Refer to the intelligent tester operator's manual for furthe ...