1997 Ford Mustang Base, 2D Convertible, AutomaticFACTORY OEM SERVICE PROCEDURE

Data Link Diagnostics

  1. Connect New Generation Star (NGS) scan tester on Data Link Connector (DLC) and perform proper hook-up procedure. See EQUIPMENT HOOK-UP .
  2. Turn ignition switch to ON position. Rotate dial on scan tester to menu item DIAGNOSTIC DATA LINK and press trigger. A test will be performed on the BUS (circuits No. 914 and 915) for the module communications network and the ISO 9141 communication link circuit No. 70. This is the Light Blue/White wire that goes between terminal No. 7 on DLC and the air bag diagnostic monitor.
  3. If scan tester displays CKT 914 (+) = SYSTEM PASSED and CKT 915 (-) = 0000, module communications network is okay. If scan tester displays CKT 70 = SYSTEM PASSED, ISO 9141 communication link is operating properly.
  4. If scan tester displays CKT 914 (+) = 0001 and CKT 915(-) = 0001, go to TEST A: POWERTRAIN CONTROL MODULE (PCM) FAULT ON CIRCUIT NO. 914/915 under TESTING .
  5. If scan tester displays CKT 914 (+) = 0002 and CKT 915(-) = 0002, go to TEST B: PASSIVE ANTI-THEFT SYSTEM (PATS) FAULT ON CIRCUIT NO. 914/915 under TESTING .
  6. If scan tester displays CKT 914 (+) = 0003 and CKT 915(-) = 0003, and vehicle is equipped with passive anti-theft system, go to TEST C: FAULT ON CIRCUIT NO. 914/915 under TESTING . If scan tester displays CKT 914 (+) = 0003 and CKT 915 (-) = 0003, and vehicle is not equipped with passive anti-theft system, go to TEST A: POWERTRAIN CONTROL MODULE (PCM) FAULT ON CIRCUIT NO. 914/915 under TESTING .
  7. If scan tester displays CKT 70 = 0001, go to TEST D: AIR BAG DIAGNOSTIC MONITOR COMMUNICATION FAULT under TESTING .
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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