| Effects of leaks in charge air system |
| A - Leaks downstream of air mass meter |
| Possible causes of trouble: |
| 1 - | Hose connecting air mass meter to turbocharger |
| 2 - | Connecting hose to crankcase breather |
| 3 - | Connecting hose to mechanical turbocharger air recirculation valve |
| B - Leaks downstream of turbocharger (intake side) |
| Possible causes of trouble: |
| 1 - | Air intake hoses and pipes between turbocharger and charge air cooler |
| 2 - | Air intake hoses and pipes between charge air cooler and intake manifold |
| 4 - | Seal underneath charge pressure sender -G31- |
| 5 - | Seal between throttle valve module and intake manifold |
| 6 - | Gasket between intake manifold and cylinder head |
| - | Inadequate charge pressure |
| C - Leaks downstream of turbocharger (exhaust side) |
| Possible causes of trouble: |
| 1 - | Connection between exhaust manifold and turbocharger |
| 2 - | Connection between exhaust manifold and cylinder head |
| - | Inadequate charge pressure; possible smell of exhaust gas, traces of soot in engine compartment |
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