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  Topic Review (Newest First)
03-10-2016 05:40 PM
sergio001
Problem Bypass air control/Throttle valve control

Hello everybody.

I have a Volvo V50, (M/Mw76/V50), 1.6d, 80KW, year 2006, engine D4164T.
I have again some problems with the engine.

The faults codes in VIDA are:
ECM - 68BD Intercooler bypass throttle - Faulty signal
ECM - 9150 Inlet control valve - Signal too low
ECM - 6890 Intercooler bypass throttle - Signal too low
ECM - 9120 Inlet control valve - Signal missing
ECM - 688D Intercooler bypass throttle - Signal missing

The full body of this parts -Bypass air control valve + Throttle valve control unit - are new.
First time when the faults codes starts, the Volvo dealer check the wires, ground connections, fuses... and after that recommend to change the whole part.
After they change it, the fault codes come again. They change again the whole part in warranty, but again the same fault codes. At that moment they tell me that they believe is the ECU.
I send the ECU to BBA England to be check and they tell me that the ECU is fine.
Back to Volvo, they says that is the ECU.
Contact again the BBA England, they check again the datas and the ECU is fine.
I buy Power Probe Short Finder ECT2000 and it never show a broken wire.
I make measurements of the voltage/resistance of the wires of the valves and I have this values:

Measurements of voltage:

For the Bypass air control valve -- A14.4
pin #1 - 4.96 V
#2 – no wire
#3 - 3.2 V
#4 - 12.15 V
#5 - 0V
#6 - 0V

For the Throttle valve control unit A20.1
pin #1 - 4.96 V
#2 – no wire
#3 - 12.15 V
#4 - 2.77 V
#5 - 0V
#6 - 0V

Measurements of resistance:

For the Bypass air control valve -- A14.4
pin #1 - 1 ohm
#2 – no wire
#3 - 1 ohm
#4 - 1 ohm
#5 - 0.7 ohm
#6 - 1 ohm

For the Throttle valve control unit A20.1
pin #1 - 1 ohm
#2 – no wire
#3 - 1 ohm
#4 - 1 ohm
#5 - 0.7 ohm
#6 - 1 ohm

If anyone has any ideas is more than welcome.
Thank you.

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