Cummins ISM11 Engine ECU Repair

We took the CM876 coded engine Ecu of the Cummins ISM11 engine to the desktop for repair. First of all, we make a connection between CM876 ECU and Ecutest Ecu Simulation and Test Device.

How to Repair Cummins ISM11 Engine ECU?

We made the connection with the CM876 ECU with the Universal Socket, which is provided with the Ecutest Ecu Simulation and Test Device, allowing you to easily connect to all heavy vehicle and passenger engine Ecu .

Upon the request of our customers, we can make it in the original socket of each engine Ecu , so you can connect the socket directly to the ECU and make your connection.

After making our connection, we open our simulation of the Ecutest Ecu Simulation and Test Device from the computer. After selecting the vehicle brand and model, we confirm the ECU (Engine Ecu) Cummins ISM11-CM876 and enter our simulation screen.

When we run our simulation screen, we first check the ‘Sensor Powers’ sensor supply voltages and see that it is OK. We see that the injectors are working both on the simulation screen and on the Ecutest Ecu Simulation and Test Device.

Ecu Repair
Ecu Test

When we come over the place that fails in the red light visible under the injectors, we see that it is a “Fuel Shut-Off Actuator”. Thus, we find the malfunction of the CM876 ECU. Then, by clicking the “Component Description” button on our simulation screen, we see the internal diagram of the CM876 ECU.

Here it is written the role and brand of the circuit elements. Here we find the circuit element that controls the Fuel Cut Actuator. Then, by clicking on the “Electric Diagram”, we see the pin ends and signal types that the Fuel Cut Actuator is connected to.

Thus, thanks to the Ecutest Ecu Simulation and Test Device, we learn both the circuit element and the pin ends. First, we check the circuit path from the ECU pin to the circuit element to which the fuel cut-off actuator is connected with a multimeter, we see that it is OK.

After seeing that the circuit is OK, we check the circuit element it is connected to and observe that it has lost its function and its integrated legs are short-circuited to the chassis. With the help of a soldering iron, we remove the defective integrated without damaging the ECU and place the solid one in its place.

After doing our process, we connect the CM876 ECU to the Ecutest Ecu Simulation and Test Device again. We see that there is no problem in the ECU that we open our simulation screen, and we complete our test.

Thus, thanks to the Ecutest Ecu Simulation and Test Device, we can solve the problem of the CM876 ECU in the fastest, easiest and lowest cost. We deliver the CM876 ECU to our customer.

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