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Scan Tool Does Not Power Up

  1. Check CIG/ACCY fuse in instrument panel fuse block. If fuse is okay, go to next step. If fuse is blown, check for short to ground in Orange wire between terminal No. 16 at Data Link Connector (DLC) and CIG/ACCY fuse. Repair wiring as necessary and retest.
  2. Check for battery voltage at terminal No. 16 (Orange wire) at DLC. If battery voltage is present, go to next step. If battery voltage is not present, check for an open in Orange wire between DLC and CIG/ACCY fuse. Repair wiring as necessary.
  3. Check for open in Black wire between ground and terminal No. 4 at DLC. If ground circuit is okay, go to next step. If faulty circuit is found, repair Black wire as necessary.
  4. Check for poor connections between scan tool and terminals No. 4 and 16 at DLC. If poor connections are found, repair as necessary. If connections are okay, scan tool may be malfunctioning. Check scan tool manual for diagnostic procedures. Repair or replace scan tool as necessary.
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