RE: 84 sEVILLE cODE 30
This is for the DFI Code 30: To check that the ISC motor retracts and extends when commanded to do so by ECM. Clear codes and exit diagnostics, Re-enter diagnostics and enter the output cycling test- code 96. Visually check to see if ISC motor extends and retracts. If that is OK then check ISC adjustment, the plunger pin should not be touching the throttle lever. ( do you get throttle ratchet??) If that test doesn't retract the ISC then check linkage for free movement, disconnect ISC motor, while output cycling jumper harness pin A and B together, connect test light between pin D and ground. Light/ no light?? Light flashes for three seconds replace ISC motor. No light, check for faulty ECM or check circuit #425 which is Pin D for short to ground. ISC motors are a hard item to find, let me know if you need help there.