Fault Recognition/Diagnosis

The OBD II regulations require that any fault with the EML IIIs system that can affect emissions must turn on the "Check Engine Lamp" and be accessible through the OBD II read out connector. These faults will also be stored in the fault memory of the EML IIIs control module for access through the DIS test programs.

The failure warning of the EML IIIs system is through the check control system (CCM) of the E38. A fault message from the EML control module is sent to the CCM and the message will be posted in the matrix display of the instrument cluster.

The diagnosis program of the DIS includes the "Fault Symptom" troubleshooting paths as well as the Test Modules, Service Functions and Expert Modes introduced with the E38 740i.

Diagnosis and troubleshooting should always begin with the fault symptom troubleshooting mode. Follow the test modules and diagnostic path provided by the DIS Tester.