Mass air flow in front of throttle implausible
Diagnostic conditions
• Battery positive voltage between 10 V and 16 V
• Engine running
Possible cause of fault
♦ Throttle stiff or 'blocked'
♦ Secondary air between hot film mass air flow meter and throttle
(e.g. crack in hose)
♦ Throttle adjusting unit faulty
♦ Hot film mass air flow meter faulty (intake air temperature sen- sor)
♦ Hot film mass air flow meter faulty
♦ DME faulty (pressure sensor for ambient air pressure)