LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 1993 >> Forward Control 4.3 Z, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Tests W/Codes - V6 >> Self-Diagnostic Tests >> Code 38, Knock Sensor Circuit Open - 4.3L "S" & "T" Series Pickup With Manual Transmission >> Notes

Code 38, Knock Sensor Circuit Open - 4.3L "S" & "T" Series Pickup With Manual Transmission: Notes

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. VCM applies and monitors 5 volts on knock signal circuit. This voltage should be present on sensor leads with sensors disconnected.
  2. Determines if wiring or knock sensor portion of the VCM's internal PROM (MEM-CAL) is faulty
  3. An improperly installed knock sensor can prevent knock sensor from grounding to block.
scientia non olet · About LEMON Manuals