Toyota/Lexus U660E, U660F: Critical Wear Areas And Vacuum Test Locations
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Toyota/Lexus: Critical Wear Areas, Vacuum Test Locations

There are several variables that influence vacuum readings.

OE valves are shown in a rest position and should be tested in a rest position unless otherwise indicated. Test locations are pointed to with an arrow. Springs are not shown for visual clarity. A low vacuum reading indicates wear.

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What should my vacuum test results be?

While a properly calibrated and maintained test stand will give consistent vacuum reading results for a specific circuit and amount of wear, evaluating these results requires establishing your own pass/fail criteria. Variables that influence vacuum readings are the number of spools tested in a captive circuit, spool diameter size, and contact length of the spool within the bore. Pass/Fail standards are specific to your setup and process, but they also must be based on your experience, quality sensitivity, warranty concerns and cost/pricing structure. You should keep a record of vacuum results for each valve body at each tested circuit/port location. This lets you compare results over time to help determine for your shop what an acceptable vacuum reading is for each circuit/port location.

For specific vacuum test parameters, refer to additional information available at

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