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:

On-vehicle inspection
1. CHECK RADIATOR RESERVOIR CAP SUBASSEMBLY a) Measure the valve opening pressure. (1) If there are water stains or foreign matter on rubber packings 1, 2 or 3, clean the part(s) with water and finger scouring. (2) Check that rubber packings 1, 2 and 3 are not deformed, cracked or swol ...

Removal
1. REMOVE FRONT WHEEL 2. REMOVE FRONT AXLE HUB LH NUT HINT: (See page AH-4) SST 09930-00010 3. SEPARATE SPEED SENSOR FRONT LH HINT: (See page AH-4) 4. SEPARATE FRONT DISC BRAKE CALIPER ASSEMBLY LH HINT: (See page AH-4) 5. REMOVE FRONT DISC 6. SEPARATE TIE ROD ASSEMBLY LH HINT: (See pa ...

Open in Front Passenger Side Squib 2nd Step Circuit
DTC B1186/58 Open in Front Passenger Side Squib 2nd Step Circuit DESCRIPTION The front passenger side squib 2nd step circuit consists of the center airbag sensor assembly and the front passenger airbag assembly. The circuit instructs the SRS to deploy when deployment conditions are met. ...