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System Testing: Notes

NOTE: Always check module power and ground circuits prior to replacing a control module. See appropriate wiring diagram in DATA LINK CONNECTORS, GROUND DISTRIBUTION or POWER DISTRIBUTION article in WIRING DIAGRAMS.
SYMPTOM INDEX

Condition Go To Test
Anti-Lock Brake Control Module Does Not Respond To NGS Tester A 
Powertrain Control Module (PCM) Does Not Respond To NGS Tester B 
Transmission Control Module (TCM) Does Not Respond To NGS Tester C 
No Module/Network Communications - Unable To Communicate With Any Module D 
No Module/Network Communications - No Power To DLC C2018 E 
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