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Data Link Diagnostic Test

  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 on. Rotate dial on NGS 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 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. Return to article that directed you here and continue diagnosis.
  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.
    • If no response from NGS tester, go to TEST G: NO MODULE/NETWORK COMMUNICATION under TESTING.
    • If NGS tester displays CKT 70, CKT 914 and/or CKT 915 = SOME ECUS NO RESP/NOT EQUIP, go to SYMPTOM INDEX table to continue diagnosis.
    • If NGS tester displays CKT 70 = ALL ECUS NO RESP/NOT EQUIP, go to TEST F: NO MODULE/NETWORK COMMUNICATION - ISO 9141 LINK under TESTING.
    • If NGS tester displays CKT 914 = ALL ECUS NO RESP/NOT EQUIP, go to TEST E: POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO NGS TESTER under TESTING.
    • If NGS tester displays CKT 915 = ALL ECUS NO RESP/NOT EQUIP, go to TEST E: POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO NGS TESTER under TESTING.
    • If module in question is NO RESPONSE/NOT EQUIPPED, go to SYMPTOM INDEX table to continue diagnosis.
    • If module in question is NO RESPONSE ON CKT 914 (BUS +), go to TEST E: POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO NGS TESTER under TESTING.
    • If module in question is NO RESPONSE ON CKT 915 (BUS -), go to TEST E: POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO NGS TESTER under TESTING.
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