Diagnostic help

When idling, the need of fuel to the engine has been 5 mg/c greater than that which the control module had calculated with the information received from the mass air flow sensor

Fault diagnosis first determines whether the pressure sensors show about the same value with the ignition ON, as the mass air flow sensor is later compared with the intake air pressure. If the pressure sensors are OK but the mass air flow sensor is incorrect then check for air leaks after the throttle and thereafter, change the mass air flow sensor.

If the air quantity is OK, then the fuel supply is checked, i.e. pressure, response, pump flow and finally the injectors.

Functions in the diagnostic tool related to the fault:

• Diagnostic status for the diagnosis.
• O2S 1, unit V
• Additive adaptation, unit mg/c.
• Closed loop, unit %.
• Purge Adaptation, unit %.
• Air mass deviation from calculated, unit %.