Quote:
Originally Posted by xoxoxoBruce
Sure, they went through the diagnostic procedure, ...
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Diagnostic procedure does not work for intermittent problems. It can only identify a constantly defective part. Intermittents require additional facts.
In a previous discussion, I noted Toyota's biggest problem. People. In this case, the mechanic cannot really be effective if, for example, the exact conditions during every 'failure' are not defined. For example, Cloud later noted that this failure occurred as the car was warming. Also critical are factors such as where the temperature needle on the gauge was located during each failure? Was it accelerating or during constant speed? How many minutes after starting the cold engine? How much gas in the tank? Was air conditioner on? Headlights? Does it happen at night and day? Does it happen when going uphill or down?
Just a short list of what must be provided so that a mechanic can really do his job. A problem because most people cannot bother to collect facts or make the problem reproducible. And because so many people only get angry when asked question after question. So many want intermittent problems solved immediately.
So a mechanic (if not provided an oscilloscope and without information on how to make the problem reproducible) can only keep replacing parts until something works - shotgunning. That will be the solution here.
Check list said if the IACV is not constantly failed, then replace the computer. Check list procedure does not address an IACV failure that occurs, for example, only as the engine gets warm. Only way a mechanic can find / fix that problem is if a person / driver volunteers that fact.