Technical Service Bulletin TJ20402.3.4-2017 — 2009 VOLVO S40

Technical Journal TITLE : The Error Frame Finder (EFF) can be an aid in fault tracing intermittent CAN network problems by providing a visible indication of error frames that are being transmitted on the network when the fault becomes active. The advantage of using the EFF function is that error frames are usually transmitted on the network before a vehicle symptom can occur. Hence, if the fault is very intermittent in nature, it may be possible, for example, to induce the wiring fault for a short duration by manipulating the vehicle harnesses and connectors. The electrical fault will occur and be detected by the EFF without ever having a vehicle symptom appear. The instructions for setting up the tool have been simplified.