Multi-ECM engines operate with more than one ECM. The controlling ECM is referred to as the Master ECM, while one Receiver is referred to as the first receiver and the other, if required, is the second receiver.
An engine sensor harness for multi-ECM engines is a wiring harness that connects the various sensors on the engine to the multiple electronic control modules (ECMs). It is a critical component of the engine management system, as it allows the ECMs to monitor and control the engine’s operation.
The Engine Sensor Harness is installed at the factory and is delivered connected to all sensors and all ECMs. This harness contains the following:
SAE J1939 communication link between the ECMs
A Turbo Boost Sensor for each ECM
The Timing Reference Sensor (TRS) and Synchronous Reference Sensor (SRS) are shared by the ECMs.
See Figure 2-4 for an illustration of the Series 4000 multi-ECM Sensor Harness and see Figure 2-5 for an illustration of the Series 2000 multi-ECM Sensor Harness. Refer to section 92, for a harness schematic.
