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6X Signal Fault The 6X output signal is a five volt square wave that is initially high. The signal switches low at each of the six. 60 degrees crankshaft position (CKP) sensor pulses. The 6X signal is used by the PCM for greater rpm resolution and in determining KS circuit (system) (knock retard) windowing. Diagnostic Trouble Code parameters: DTC 19 will set if: Three 6X pulses do not occur between each reference pulse. A 6X pulse does not immediately follow a reference pulse.

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Q: What is a code 19 signal fault on a 1992 Saturn twin cam?
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