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:

Oxygen (A/F) Sensor Heater Control Circuit
HINT Although the DTC titles say the oxygen sensor, these DTCs relate to the Air-Fuel Ratio (A/F) sensor. Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and located near the engine assembly. DESCRIPTION Refer to DTC P2195 (See page ES- ...

Inspection
1. Inspect pack clearance of reverse clutch (A) install the intermediate shaft and needle roller bearing onto the transaxle rear cover. (B) using a dial indicator, measure the reverse clutch pack clearance while applying and releasing compressed air (392 kpa, 4.0 Kgf/cm2, 57 psi). Pack c ...

Diagnosis system
1. DESCRIPTION (a) Release the parking brake pedal. (b) Check the warning lights. When ignition switch is turned ON, check that the ABS warning light and brake warning light come on for 3 seconds. HINT: When parking brake is applied or the level of the brake fluid is low, the bra ...