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:

Disassembly
1. REMOVE STOP LIGHT SWITCH ASSEMBLY (a) Turn the stop light switch assembly counterclockwise and remove the stop light switch assembly. (b) Remove the stop light switch mounting adjuster from the brake pedal support sub-assembly. 2. REMOVE STOP LIGHT SWITCH CUSHION (a) Remove the stop ligh ...

Safety Connect LED light Indicators
When the engine switch is turned to the “ON” position (vehicles without a smart key system) or IGNITION ON mode (vehicles with a smart key system), the red indicator light comes on for 2 seconds then turns off. Afterward, the green indicator light comes on, indicating that the service is act ...

Scratched / Reversed Disc
DTC 44-46 Scratched / Reversed Disc DESCRIPTION DTC No. DTC Detecting Condition Trouble Area 44-46 Scratches or dirt is found on DVD surface or DVD is set upside down. DVD  Television display assembly INSPECTION PROCEDU ...