C7 and C9 Marine Engines Caterpillar

The Electronic Control Module (ECM) detects the following conditions:

• The engine oil temperature is greater than 18 °C (64 °F) and the desired injection actuation pressure and actual injection actuation pressure differ by more than 3 MPa (435 psi).

• There are no active diagnostics for the injection actuation pressure sensor and/or the 5 VDC supply.

While the above mentioned conditions are true the ECM detects one of the following conditions:

• Engine speed is detected and there is plenty of fuel.

• The current to the injection actuation pressure control valve is at the maximum output for an excessive period of time or the current to the injection actuation pressure control valve is at the maximum output for at least three seconds while the engine is being cranked.

• The injection actuation pressure control valve is at minimum output for an excessive period of time and engine speed is less than 1900 RPM or engine speed is greater than 1900 RPM and injection actuation pressure is greater than 15 MPa (2175 psi).

Note: The diagnostic code indicates a mechanical problem. The ECM and the electronic control system are operating correctly.

System Response:

The ECM will log the diagnostic code.

• The engine may experience low power and/or unstable idle.

• The engine may be difficult to start at normal operating temperatures and/or easy to start below normal operating temperatures.

Note: The problem may only exist at operating temperature. Air may be trapped in the injection actuation system if the system has been serviced recently. Start the engine and run the engine at 1500 rpm for a few minutes in order to remove the trapped air.

Test Step 1. Perform the following diagnostic procedure: Injection Actuation Pressure - Test

Results:

• OK - STOP