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Data Link Diagnostic Test

NOTE: Circuit No. 70 is the White wire (White/Blue wire if equipped with ABS) connected to terminal No. 7 on Data Link Connector (DLC). This is the ISO 9141 circuit. Circuit No. 914 is the Gray wire (Gray/Violet wire if equipped with traction control) connected to terminal No. 2 on DLC. This is the SCP (+) circuit. Circuit No. 915 is the Blue wire (Blue/White wire if equipped with traction control) connected to terminal No. 10 on DLC. This is the SCP (-) circuit.
  1. Connect New Generation Star (NGS) tester to Data Link Connector (DLC), if not already connected. Select vehicle to be tested from NGS tester menu.
  2. Turn ignition switch to RUN position. Rotate dial on NGS tester to menu item DIAGNOSTIC DATA LINK and press trigger. A test will be performed on bus (circuits No. 914 and 915) network and ISO 9141 network (circuit No. 70).
  3. If NGS tester displays CKT 914 (+) = SYSTEM PASSED and CKT 915 (-) = SYSTEM PASSED, module communications network is okay. If NGS tester displays CKT 70 = SYSTEM PASSED, ISO 9141 communication link is operating properly. Repair communication concern by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
  4. If NGS tester does not display CKT 914 (+) = SYSTEM PASSED, CKT 915 (-) = SYSTEM PASSED and CKT 70 = SYSTEM PASSED, perform the following as applicable:
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