Question about 2000 Volkswagen Jetta TDI

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Dtc p1550 1999 vw tdi intermittent poor power.

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For VW TDI: Fault code P1550 = "Charge Pressure Deviation"
You must check up all vacuum hoses, the pressure charge air line (pressure hoses, spring-type clips, charge air cooler), the vacuum reservoir and also all solenoid control valves.
You must try follows if you are able to do this:
1. Engine stopped and ignition switch off. Check all pneumatic connections and hoses between turbocharger actuator = pressure unit for boost-pressure control, boost-pressure control solenoid valve, vacuum reservoir, EGR control solenoid valve, intake-manifold flap solenoid valve, EGR valve with throttle - part of intake manifold. Also the vacuum connection between tandem pump and brake booster. If you find something wrong replace parts. If not go to step 2.
2. Extract the hose of the turbocharger actuator = pressure unit for boost-pressure control part of turbocharger. Instead of the original hose you must place another 1 meter long hose with the same inside diameter, and then you check to inspire yourself the air from the other one extremity of this hose. The mechanical connecting rod of the turbocharger actuator must have a smooth and whole motion. If you can do that with your mouth, then you must replace the boost-pressure control solenoid valve. If you can not reach this with your mouth, then you go to step 3.
3. This is the most difficult work. The problem is that the soot particles deposits inside the turbocharger plugging the variable nozzle geometry mechanism = adjustable vanes of the turbine. If the turbocharger actuator is not able to adjust the turbine vanes the charge air pressure increase too much and ECU (engine control unit) go in "limp mode" = engine protection software. As a result the "limp mode" engine still running until you turn the engine off (ignition switch off) and back on when the "limp mode" is deactivated.
4. You must be able to extract the turbo from the engine and then to disassemble the turbocharger, clean inside adjustable vanes mechanism and refit all.
It is some work to do here, but after that you will be full satisfied!

Posted on Jul 11, 2009

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Could be the N75 valve on the firewall (white with vacuum hoses going to it). Could be the black & white check valve in the vacuum line from the N75 to the turbo.
Could be a vacuum line that is disconnected or leaking. Could be sticky VNT vanes in the turbo. Those are the most common causes.

Posted on Jul 10, 2009

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