| J1939 Code | CDL Code | Description |
|---|---|---|
1077–11 Engine Fuel Injection Pump Controller : Other Failure Mode |
1684–11 Fuel Injection Pump : Other Failure Mode |
The ECM has detected that the high-pressure fuel pump performance has degraded. The high-pressure fuel pump is failed. |
1077–12 Engine Fuel Injection Pump Controller : Failure |
1684–12 Fuel Injection Pump : Failure |
The Electronic Control Module (ECM) has detected that the high-pressure fuel pump has failed. |
Note: A faulty fuel rail pressure sensor will NOT cause this code to log.
This diagnostic monitors the output of each of the pumping elements internal to the fuel pump using the fuel rail pressure sensor. The ECM monitors the rail pressure and can detect when each plunger internal to the fuel pump is pressurized and pumps fuel to the fuel rail. When the ECM detects that one or more of the plungers is not putting out the same amount of pressure as the other plungers, the fault code comes active. This diagnostic is intended to alert the operator that the fuel pump has failed and performance issues may result.
The -11 diagnostic is intended to alert the operator that the fuel pump performance has degraded to the point where performance losses may be noticed.
The -12 diagnostic is intended to alert the operator that the fuel pump has failed and performance issues or more damage may result.
If the fuel pump is not replaced, further fuel system damage or engine damage could result.
| Troubleshooting Test Step | Value | Result |
|---|---|---|
1. Replace the High-Pressure Fuel Pump. A. Refer to the Disassembly and Assembly, Fuel Pump (High Pressure) - Remove and Install. |
High-pressure fuel pump |
Result: The high-pressure fuel pump was replaced. |
If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).