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Typical Malfunction Thresholds

WARNING: This page is about a different car, the 2007 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.
TYPICAL MALFUNCTION THRESHOLDS - DESCRIPTION CHART

Either of following conditions met:  
Difference between VTA sensor 1 voltage (learned value) and VTA2 sensor 2 voltage (learned value) Less than 0.4 V, or more than 1.2 V