System Tests: Notes

NOTE: Tests included in this article are written specifically for New Generation Star (NGS) tester functionality. Other OBD II-compatible scan tools may be used, but may not be equipped with equal test function capabilities. Refer to scan tool manufacturer's instructions.

NOTE: Always check module ground and power circuits prior to replacing a control module. See WIRING DIAGRAMS .

SYMPTOM INDEX

Condition

Go To System Test

4-Wheel Anti-Lock Brake System Control Module Does Not Respond To Scan Tool

Electronic Crash Sensor Module Does Not Respond To Scan Tool ⁽¹⁾

Powertrain Control Module Does Not Respond To Scan Tool

Auxiliary Powertrain Control Module Does Not Respond To Scan Tool

⁽²⁾D

Natural Gas Vehicle Module Does Not Respond To Scan Tool

⁽³⁾E

No Module/Network Communication - ISO 9141 Network

No Module/Network Communication - SCP Bus

No Module/Network Communication

⁽¹⁾	Electronic Crash Sensor (ECS) module may also be referred to as air bag diagnostic monitor.

⁽²⁾	This test applies only to vehicles equipped with diesel engines.

⁽³⁾	This test applies only to vehicles equipped with natural gas engines.