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ISC Motor Harness Inspection (Excel Federal)

  1. Check continuity of circuits between ISC motor and ECM. Ensure ignition is off. Disconnect ECM harness connector. Connect jumper wire between ECM harness connector terminal No. 1 (Blue/Yellow wire, connector C50-2) and vehicle ground. See Figure or Figure .
  2. Using ohmmeter, check resistance between ISC motor harness connector terminal No. 1 (Red wire) and vehicle ground. If continuity does not exist, inspect and repair circuit as needed.
  3. Move jumper wire between ECM harness connector terminal No. 2 (Blue/White wire, connector No. C50-2) and vehicle ground. Using ohmmeter, check resistance between ISC motor harness connector terminal No. 2 (Orange wire) and vehicle ground. If continuity does not exist, inspect and repair circuit as needed.
NOTE: For Idle Air Control (IAC) motor testing information for Scoupe, see appropriate TESTS W/CODES article in the ENGINE PERFORMANCE Section.
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