Toyota Sienna Service Manual: Customer problem analysis

Toyota Sienna Service Manual / Introduction / How to troubleshoot ecu controlled systems / How to proceed with troubleshooting / Customer problem analysis

HINT:

In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
Gather as much information as possible for reference.
Past problems that seem unrelated may also help in some cases.
The following 5 items are important points in the problem analysis:

What	Vehicle model, system name
When	Date, time, occurrence frequency
Where	Road conditions
Under what conditions?	Running conditions, driving conditions, weather conditions
How did it happen?	Problem symptoms

Operation flow

HINT: Perform troubleshooting in accordance with the procedures below. The following is an outline of basic troubleshooting procedures. Confirm the troubleshooting procedures for the circuit you a ...

Symptom confirmation and diagnostic trouble code

HINT: The diagnostic system in the SIENNA has various functions. The first function is the Diagnostic Trouble Code (DTC) check. A DTC is a code stored in the ECU memory whenever a malfunctio ...

Other materials:

Perform zero point calibration of yaw rate and deceleration sensor (when using sst check wire)
NOTICE: While obtaining the zero point, do not vibrate the vehicle by tilting, moving or shaking it and keep it in a stationary condition. (Do not turn the ignition switch to the ON position.) Be sure to do this on a level surface (with an inclination of less than 1 %). (a) Proc ...

Short to GND in Rear Curtain Shield Squib LH Circuit
DTC B1637/85 Short to GND in Rear Curtain Shield Squib LH Circuit DESCRIPTION The rear curtain shield squib LH circuit consists of the center airbag sensor assembly and the curtain shield airbag assembly LH. The circuit instructs the SRS to deploy when deployment conditions are met. DTC ...

Diagnostic trouble code chart
If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table below. (Proceed to the page given for that circuit.) POWER BACK DOOR SYSTEM DTC No. Detection Item Trouble Area B2222 PBD Pulse Sensor Malfuncti ...