Toyota Highlander Service Manual: Customer problem analysis

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

HINT:

In troubleshooting, the problem symptoms must be confirmed accurately. Preconceptions should be discarded in order to give an accurate judgement. 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 it occurred.
As much information as possible should be gathered for reference. Past problems that seem unrelated may also help in some cases. In the Diagnostic section, a customer problem analysis table is provided for each system.
5 items are important points in the problem analysis:

Customer problem analysis

(Sample) Supplemental Restraint System check sheet.

Customer problem analysis

How to proceed with troubleshooting

HINT: Carry out troubleshooting in accordance with the procedures below. Only a basic procedure is shown. Details in the Diagnostic Section show the most effective methods for each circuit. Conf ...

Symptom confirmation and diagnostic trouble code

HINT: The diagnostic system in the HIGHLANDER 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 malfun ...

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HOW TO PROCEED WITH TROUBLESHOOTING HINT: Troubleshoot in accordance with the procedures on the following pages. 1 VEHICLE BROUGHT TO WORKSHOP 2 CUSTOMER PROBLEM ANALYSIS 3 PROBLEM SYMPTOM CONFIRMATION (a) If the symptom does not occur, proceed to A. (b) If the symptom occurs, proceed to B. ...