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:

Short in Driver Side Squib Circuit
DTC B0100/13 Short in Driver Side Squib Circuit DESCRIPTION The driver side squib circuit consists of the center airbag sensor assembly, the spiral cable and the steering pad. The circuit instructs the SRS to deploy when deployment conditions are met. DTC B0100/13 is recorded when a short ci ...

How to proceed with troubleshooting
HINT: Troubleshoot in accordance with the procedures on the following pages. 1 VEHICLE BROUGHT TO WORKSHOP 2 DTC CHECK Check for DTCs and make a note of the code that is output (See page MP-14). Delete the DTC. Check if the DTC is output once again when the problem symptom is simulat ...

Internal Control Module Random Access Memory (RAM) Error
DTC P0604 Internal Control Module Random Access Memory (RAM) Error DESCRIPTION The ECM continuously monitors its own internal memory status, internal circuits, and output signals transmitted to the throttle actuator. This self-check ensures that the ECM is functioning properly. If any malfu ...