Signal Too Low (2007): Verification: Verification

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

Fig 1: Engine Start Verification

Courtesy of VOLVO CARS CORPORATION

• Connect the manometer. See:FUEL PRESSURE GAUGE
• Run the engine to operating temperature. Allow the engine to idle
• Air conditioning (A/C) off.

  Read off the relative fuel pressure.

  The relative fuel pressure is calculated from the fuel pressure sensor and the atmospheric pressure sensor signal (= absolute pressure minus atmospheric pressure).

  Check that the value on the manometer and the value displayed in VIDA are the same. If the values are different, this indicates incorrect function.

  Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA (Volvo Scan Tool)

  Courtesy of VOLVO CARS CORPORATION
  Fig 3: Identifying Fuel Pressure Sensor

  Courtesy of VOLVO CARS CORPORATION

Is the function OK? 

• YES 

  VERIFIED:  Troubleshooting has been completed.

• NO 

  Refer to INFORMATION 

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

Fig 1: Engine Start Verification

Courtesy of VOLVO CARS CORPORATION

Fig 2: Checking Connector

Courtesy of VOLVO CARS CORPORATION

• Ignition off
• Reinstall the connectors, components etc.
• Engine idling
• Read off the fuel pressure and the fuel pump (FP) work load.
  • 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 (FP) work load. The requested pressure is 380 kPa at idling speed. A (relative) fuel pressure lower than 380 kPa together with a high fuel pump (FP) work load indicates a fault in pressure regulation.

  Fig 3: Identifying VCT2000 Diagnostic Tool Symbol In VIDA (Volvo Scan Tool)

  Courtesy of VOLVO CARS CORPORATION

Is the signal within its permitted range? 

• YES 

  VERIFIED:  Troubleshooting has been completed.

• NO 

  Refer to INFORMATION