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Diagnostic Aids

When engine cools to ambient temperature or sits overnight, CTS and MAT sensor resistance or temperature may be checked with a Scan tester and readings should be close to each other. A Code 23B appears if Purple/Black wire is shorted to ground. If code is intermittent, see TESTS W/O CODES article.

Fig 1: Code 23B Circuit Diagram

Fig 2: Code 23B Flow Chart