Possible Causes
- Vacuum system leaking
- Electronic vacuum regulating valve (EVRV) - Lower
- Electronic vacuum regulating valve (EVRV) - Upper
- Exhaust Gas Recirculation (EGR) vacuum actuator
- HP EGR bypass valve vacuum actuator
- HP EGR cooler vacuum operated valve
- LP turbocharger vacuum operated wastegate valve
- Connecting vacuum pipes
- Vacuum connection to variable flow oil pump with integral vacuum pump
- Vacuum connection to brake vacuum sensor and brake booster
- Intake system leaking
- Exhaust manifold leaking - Before the turbocharger
- Variable geometry turbocharger vane actuator position sensor circuit short circuit to ground, short circuit to power, open circuit, high resistance
- Variable geometry turbocharger vanes mechanical failure
- Variable geometry turbocharger vane actuator failure