Author Topic: Turbo issue  (Read 6521 times)

Offline paradisiac82

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  • 2003 Golf MK4 GTTDI ARL (PD150)
Turbo issue
« on: 02 November 2019, 19:38 »

So when driving today I went through a deep puddle (might just be a coincidence) and the coil light started flashing and I lost all turbo. The car drives fine, its just got no turbo, revs normally so not in limp mode. When you start the car it takes about 30-45 seconds for the coil light to come on (whether driving or idling) and for that time the turbo works fine, no smoking or anything. Did a fault scan when I got home


                Address 01: Engine       Labels: 03L-906-018-CFF.clb
Control Module Part Number: 03L 906 018     HW: 03L 907 309 R
  Component and/or Version: R4 2.0l TDI   H20 9978
           Software Coding: 00190012042500080000
            Work Shop Code: WSC 43069 001 1048576
              ASAM Dataset: EV_ECM20TDI01103L906018 003014 (VW36)
                       ROD: EV_ECM20TDI03L906018.rod
                      VCID: 67DA60DE9EF6947A1D-8032
1 Fault Found:

7934 - Turbocharger Boost Control Position Sensor Circuit
          P2563 00 [167] - Implausible Signal
          MIL ON - Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 202028 km
                    Date: 2112.14.29
                    Time: 19:19:03

                    Engine speed: 780.50 /min
                    Normed load value: 42.7 %
                    Vehicle speed: 0 km/h
                    Coolant temperature: 59 °C
                    Intake air temperature: 25 °C
                    Ambient air pressure: 960 mbar
                    Voltage terminal 30: 13.900 V
                    Unlearning counter according OBD: 40
                    Charge Pressure Actuator: activation: 100.00 %
                    Charge Pressure Actuator: acknowledgment: 48.41 %
                    Turbocharger boost control: offset closed: 1.21 %
                    High press turbocharger actuator: status-Bit 0: 0
                    High press turbocharger actuator: status-Bit 16: 8
                    High press turbocharger actuator: status-Bit 24: 55
                    High press turbocharger actuator: status-Bit 8: 0
                    High press turbocharger actuator: actual uncond volt value: 2260.8 mV
                    Accelerator pedal travel: 0.00 %

Before clearing the codes it also had code 9127 Actuator for Turbocharger 1 P00AF 00 [237] - Stuck

I have looked on Ross Tech for 9127 and 7934 but they do not show anything. Any ideas? is it time for a new turbo?

Offline topher

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Re: Turbo issue
« Reply #1 on: 03 November 2019, 02:50 »
actuators are common for failing on those, you can test it with a vac pump. if its gone you can get a repair kit for around £180, far cheaper than a whole turbo

Offline joe6

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Re: Turbo issue
« Reply #2 on: 05 November 2019, 16:55 »
My first thought is a position sensor problem. The implausible signal usually indicates either a sensor fault or fault with the item a sensor is monitoring. The turbocharger actuator has electronic sensors that monitor turbo vane position which controls the amount of turbo boost. Possible issues include that the electronic actuator boost sensor is defective, turbo vanes stuck or in the wrong position. Soot build up (rather like the intake manifold flaps on the GTI that I had) can affect the vane position and lead to the error signal to the ECM. Worst case is the turbo has failed but that is usually accompanied by smoke on acceleration.

Mk6 GTI Carbon Grey, 2010 Bluetooth and voice fitted, a few VCDS mods still a comfortable family car. Red Scirocco 2011 twin charger stage 1 - enjoyable drive now gone.  White 2016 Polo GTI (roller skate on steroids) replaced with an Indium Grey 2019 7.5 GTI PP.