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Data Link Diagnostics

NOTE: This test will confirm or deny proper operation of J1850 communication network or ISO 9141 communication link. Perform following procedure with ignition switch in RUN position.
  1. Connect New Generation Star (NGS) scan tester to the Data Link Connector (DLC) and perform proper hook-up procedure. See EQUIPMENT HOOK-UP  under COMMUNICATION NETWORK DIAGNOSTICS.
  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 J1850 network bus circuits No. 914 (Tan/Orange wire) and No. 915 (Pink/Light Blue wire) and the ISO 9141 communication link circuit No. 70 (Light Blue/White wire).
  3. If scan tester displays CKT 914 (+) = SYSTEM PASSED and CKT 915 (-) = SYSTEM PASSED, the J1850 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 the above message (SYSTEM PASSED), proceed testing for J1850 module communication network failure or ISO 9141 communication link failure. See DIAGNOSTIC PROCEDURE SEQUENCE under COMMUNICATION NETWORK DIAGNOSTICS  .
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