Test E: No International Standards Organization (ISO) 9141 Communications Network Communication
PINPOINT TEST E: NO INTERNATIONAL STANDARDS ORGANIZATION (ISO) 9141 COMMUNICATIONS NETWORK COMMUNICATIONE1:
E2-E4:
Normal Operation
The generic electronic module (GEM) communicates with the diagnostic tool through the ISO 9141 communications network, circuit 8-EE9 (WH/GN). The GEM is the only module on the ISO 9141 communications network. Check circuit 8-EE9 (WH/GN) between the GEM C201d and the data link connector (DLC) C251. The total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in the ISO 9141 communications network circuit, damage to the DLC C251, damage to the GEM C201d, or a problem in an in-line connector. If ISO 9141 circuit is not found to be the source of the communication problem, refer to Body Control Systems (Multifunction Electronic Control Module) to diagnose external voltage and ground connections to the GEM.
Possible Causes
- ISO 9141 communications network circuit 8-EE9 (WH/GN) open, short to ground or voltage
- DLC C251
- GEM C201d
- GEM