Checking The System

Fig 1: Engine Start Verification

Courtesy of VOLVO CARS CORPORATION

HINT: If fuel adaptations indicate too rich fuel/air mixture (adaptation value below 1.0) in several adaptation ranges, this indicates a fuel malfunction. The cause may be too high fuel pressure. 

To investigate what the problem is due to, perform the following:

• Check that the oil level is between the minimum and maximum markings

  HINT: Adaptations may show rich fuel/air mixture if several short drives have taken place and the engine oil thus has been contaminated by gasoline. 

• Check the EVAP-valve for leakage.

  HINT: A leaking valve gives a constant contribution of fuel vapors that affect the adaptations. 

• Engine running.
• Check the fuel pressure for high fuel pressure.
• Ignition on.
• Check the residual pressure with regards to too low residual pressure.

Remedy as necessary.

HINT: If the residual pressure is too low, leaking injection valves may be the cause. 

Other information 

• see FUEL SYSTEM PRESSURE, CHECKING

Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

Courtesy of VOLVO CARS CORPORATION

• Continue 

  Refer to CHECKING THE MASS AIR FLOW (MAF) SENSOR