7. Verification

Verification







HINT: After carrying out the repair, check that the fault has been remedied.

- Ignition off
- Reinstall the connectors, components etc.
- Engine idling
- Read off the fuel pressure and the work load of the fuel pump.
- The upper digital display and the graphic display (red font color) indicate the absolute fuel pressure, calculated from the fuel pressure sensor
- The center digital display (blue font color) indicates the current work load required for the fuel pump (FP) to maintain the present fuel pressure. (Normal value 50 % ±10& %.)
- The lower digital display indicates the relative fuel pressure (white font color), calculated from the fuel pressure sensor and the atmospheric pressure sensor (= absolute pressure minus atmospheric pressure). If a manometer is connected during the test, it should indicate this pressure.

Check the fuel pressure value together with the value for the fuel pump work load. The requested pressure is 380 kPa at idle speed. A (relative) fuel pressure lower than 380 kPa together with a high fuel pump work load indicates a fault in pressure regulation.

Is the signal within its permitted range?

YES: Refer to Trouble Code Descriptions. Diagnostic Trouble Code Descriptions
NO: Refer to Fault-Tracing Information - Permanent Fault.