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Scan Tool Does Not Power Up

  1. Using DVOM connected to ground, backprobe Data Link Connector (DLC) terminal No. 16 (Orange wire). See Figure . If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short to ground in Orange wire between DLC terminal No. 16 and AUX PWR fuse (25-amp) located in instrument panel fuse block. See appropriate wiring diagram in DATA LINK CONNECTORS article in WIRING DIAGRAMS.
  2. Using DVOM connected to ground, backprobe DLC terminal No. 4 (Black wire). If continuity exists, go to next step. If continuity does not exist, repair open or short to voltage in Black wire between DLC terminal No. 4 and ground connection behind left side of instrument panel below instrument panel fuse block. See appropriate wiring diagram in DATA LINK CONNECTORS article in WIRING DIAGRAMS.
  3. Check for poor connections between scan tool and DLC terminals No. 4 and 16. Repair as necessary. If DLC connections check okay, go to next step.
  4. Scan tool may be malfunctioning. Check scan tool manual for diagnostic procedures. If necessary, substitute a known-good scan tool.
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