C7 Engines for Combat and Tactical Vehicles Caterpillar

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

• The injection actuation pressure is greater than 3 MPa (435 psi) for more than three seconds when the engine is off.

• The difference in the actual pressure and the desired pressure is greater than 2 MPa (290 psi) for more than 10 seconds with the engine running.

• Actual rail pressure is between 11.0 MPa (1595.41 psi) and 17.4 MPa (2523.66 psi) for more than ten seconds.

• Sensor current changes more than 0.075 Amp and rail pressure changes less than 0.5 MPa (72.5 psi) with the engine on.

• The engine is not running and the ECM has been powered for at least four seconds.

• Cold mode is not active.

• Engine speed is 0 rpm for more than three seconds and the engine is not running.

System Response:

The ECM will indicate an active code and the code will be logged. The check engine lamp will illuminate.

The ECM will default to 10 MPa (1450.4 psi).

10 MPa (1450.4 psi) will be displayed next to the status for "Desired Injection Actuation Pressure" and the status for "Actual Injection Actuation Pressure"on the Caterpillar Electronic Technician (Cat ET). The current for the injection actuation pressure control valve is set to 275 mA.

The engine may emit white smoke at start-up because cold mode is not active.

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

Results:

• OK - STOP