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Check to see if the wiring is in good condition between the speed sensor and the pcm. Check the wiring connector near the speed sensor to see if it is packed with dirt or other contaminates. This would cause high resistance in the circuit and would give a low voltage reading.

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16y ago
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Q: Your 1998 chev cavalier shows a obd-ii trouble code po502 vss circuit low input what can you troubleshoot to find out what is wrong?
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