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:

Back Sonar Sensor RH Circuit
DESCRIPTION An ultrasonic sensor consists of a sensor portion that transmits and receives ultrasonic waves and a preamplifier that amplifies them. The ultrasonic sensor outputs the ultrasonic waves and sends the received signals to the clearance warning ECU. WIRING DIAGRAM INSPECTION PR ...

Engine
ON-VEHICLE INSPECTION 1. INSPECT ENGINE COOLANT (a) Inspect the engine coolant (See page CO-1). 2. INSPECT ENGINE OIL (a) Inspect the engine oil (See page LU-1). 3. INSPECT BATTERY (a) Inspect the battery (See page CH-5). 4. INSPECT AIR CLEANER FILTER ELEMENT SUBASSEMBLY (a) Remove the air c ...

Removal
1. REMOVE BACK DOOR CENTER GARNISH Using a clip remover, disengage the 5 clips to remove the back door center garnish. 2. REMOVE REAR SPOILER Disconnect the center stop light connector. Remove the 3 nuts. Using a clip remover, disengage the 2 clips to remove the rear s ...