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:

Terminals of ECU
1. CHECK DISTANCE CONTROL ECU Reference: waveform 1 HINT: Terminal: LRDD - SGND Gauge set: 2 V/DIV., 10 ms./DIV. Condition: ignition switch in the ON position Reference: waveform 2 HINT: Terminal: LRRD - SGND Gauge set: 2 V/ ...

Disassembly
1. INSPECT UNDERDRIVE PLANETARY GEAR PRELOAD HINT: (See page AX-260) 2. REMOVE FRONT PLANETARY GEAR NUT (a) Using SST, loosen the staked part of the lock nut. SST 09930-00010 (09931-00010, 09931-00020), 09387-00050 (b) Place the underdrive planetary gear in a soft jaw vise. NOTIC ...

System description
1. DESCRIPTION OF POWER REAR NO. 2 SEAT WITH STOWING FUNCTION A power rear no. 2 seat with stowing function has been adopted for the third-row seats. The power rear no. 2 seat with stowing function electrically stows and returns the seat when the power folding seat switch is ...