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Data Link Diagnostics

WARNING: This page is about a different car, the 1997 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
  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 on. 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 is between terminal No. 7 on DLC and the air bag diagnostic monitor and other optional modules.
  3. If scan tester displays CKT 914 (+) = SYSTEM PASSED and CKT 915 (-) = SYSTEM PASSED, module communications network is okay. If scan tester displays CKT 70 = SYSTEM PASSED, ISO 9141 communication link is operating properly.
  4. If scan tester does not display CKT 914 (+) = SYSTEM PASSED, CKT 915 (-) = SYSTEM PASSED and CKT 70 = SYSTEM PASSED, perform the following as applicable:
    • If scan tester displays CKT 70 = 00000001F, go to TEST J: NO MODULE/NETWORK COMMUNICATION - ISO 9141 LINK under TESTING  .
    • If scan tester displays CKT 914 (+) = 000000007, go to TEST H: NO MODULE/NETWORK COMMUNICATION - BUS LINK under TESTING  .
    • If scan tester displays CKT 915 (-) = 000000007, go to TEST H: NO MODULE/NETWORK COMMUNICATION - BUS LINK under TESTING  .
    • If scan tester displays CKT 70 = (module of interest listed here) NO RESPONSE/NOT EQUIPPED, go to SYMPTOM INDEX TABLE under SYMPTOM TESTING  to continue diagnosis.
    • If scan tester displays CKT 915 (-) = (module of interest listed here) NO RESPONSE/NOT EQUIPPED, go to SYMPTOM INDEX TABLE under SYMPTOM TESTING  to continue diagnosis.
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