Symptom Related Diagnostic Procedures

Effects Of Leakage At Intake And Exhaust End

Leakage downstream of Mass Air Flow sensor
- Effect: Loss of power

Possible fault sources:
1. Hose connection between mass air flow sensor and turbocharger
2. Connection hose to crankcase breather
3. Connection hose to mechanical air recirculation valve

Leakage downstream of turbocharger
- Effect: Charge air pressure too low

Possible fault sources:
1. Connection hoses and line between turbocharger and charge air cooler
2. Hose between charge air cooler and intake manifold
3. Charge air cooler
4. Gasket of Charge air pressure sensor -G31- (in charge air cooler)
5. Gasket between throttle valve control module and intake manifold
6. Gasket between intake manifold and cylinder head