Turbochargers were originally used on performance cars to boost the power. Nowadays they are also used to help small engines give reasonable performance while maintaining high fuel efficiency. Follow this Real Fix to see how to diagnose and repair a turbocharger related diagnostic code on this 2002 Volkswagen Jetta.
Vehicle
2002 Volkswagen Jetta GLS 1.8L
Title
P1200, Replaced Turbocharger Boost Control Solenoid
Complaint
The customer states the check engine light is on.
Cause
Connected a scan tool and found code P1200 – Recirculating Valve For Turbocharger N249 Mechanical Malfunction. With the scan tool connected, cleared the codes and found the check engine light illuminated after the engine was started. The code P1200 returned when monitored with the scan tool. Key on, disconnected the turbo charger boost control solenoid connector, used a multi-meter to measure the specified 12 Volt supply at terminal #1 and less than 100mV ground at terminal #2 and found both were present. Using the multi-meter measured the specified 27 to 30 Ohms resistance of the turbo charger boost control solenoid and found no continuity. Applied 12 Volts and ground using a fused set of jumper wires to the turbo charger boost control solenoid and found no audible click was heard. The results of these tests verified the turbo charger boost control solenoid was faulty.
Correction
Replaced the turbocharger boost control solenoid, cleared codes, performed a road test and verified the vehicle operated properly. The check engine light did not illuminate and no fault codes returned.
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