Data Link Diagnostic Test

NOTE: When performing Data Link Diagnostic Test, the NGS tester may display BUS circuits 4-PB9 and 5-PB9 as circuits No. 914 and 915. The NGS tester may also display ISO circuit 8-CF29 as circuit No. 70.

Connect New Generation Star (NGS) tester to Data Link Connector (DLC), if not already connected. Select vehicle to be tested from NGS tester menu.
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 4-PB9 and 5-PB9) for the module communications network and the ISO 9141 communication link (circuit 8-CF29).
If NGS tester displays CKT 4-PB9 (+) = SYSTEM PASSED and CKT 5-PB9 (-) = SYSTEM PASSED, module communications network is okay. If NGS tester displays CKT 8-CF29 = SYSTEM PASSED, ISO 9141 communication link is operating properly. Return to article that directed you here and continue diagnosis.
If NGS tester does not display CKT 4-PB9 (+) = SYSTEM PASSED, CKT 5-PB9 (-) = SYSTEM PASSED and CKT 8-CF29 = SYSTEM PASSED, perform the following as applicable.
- If no response from NGS tester, go to TEST F: NO MODULE/NETWORK COMMUNICATION under TESTING.
- If NGS tester displays CKT 70 = 00000001, go to TEST A: ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DOES NOT RESPOND TO NGS TESTER under TESTING.
- If NGS tester displays CKT 914 = 00000003, go to TEST E: NO MODULE/NETWORK COMMUNICATION - BUS LINK under TESTING.
- If NGS tester displays CKT 915 = 00000003, go to TEST E: NO MODULE/NETWORK COMMUNICATION - BUS LINK 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 SYMPTOM INDEX table to continue diagnosis.
- If module in question is NO RESPONSE ON CKT 915 (BUS -), go to SYMPTOM INDEX table To continue diagnosis.