No boost - 16621 error - Any ideas?

[jmejamie]

Hi guys

My friend has an Audi a3 Sportback 2005 1.9 TDI 103BHP and she has had a sudden loss of power. The car seems to drive like the turbo is not spooling but stills gets up some speed, it just takes a while!

We scanned the car and got the following results:

1 Fault Found:
16621 - Manifold Pressure / Boost Sensor (G31)
P0237 - 000 - Signal too Low
Freeze Frame:
RPM: 798 /min
Torque: 30.0 Nm
Speed: 0.0 km/h
Load: 0.0 %
Voltage: 14.14 V
Bin. Bits: 11000000
Absolute Pres.: 1081.2 mbar
Absolute Pres.: 2182.8 mbar

2 Faults Found:
00819 - High Pressure Sensor (G65)
009 - Open or Short to Ground - Intermittent
Freeze Frame:
Fault Status: 00101001
Fault Priority: 3
Fault Frequency: 5
Reset counter: 4
Mileage: 268134 km
Time Indication: 0
Date: 2017.12.22
Time: 14:29:33


Freeze Frame:
Temperature: 12.0°C
Voltage: 14.40 V
RPM: 1850 /min
Load: 30.0 %
Load: 25.0 %


00819 - High Pressure Sensor (G65)
001 - Upper Limit Exceeded - Intermittent
Freeze Frame:
Fault Status: 00100001
Fault Priority: 3
Fault Frequency: 1
Reset counter: 253
Mileage: 268961 km
Time Indication: 0
Date: 2018.01.09
Time: 15:53:00


Freeze Frame:
Temperature: 8.5°C
Voltage: 14.50 V
RPM: 1850 /min
Load: 0.0 %
Load: 9.0 %

I have done a log of the car on idle and flicked the throttle a little to see if the MAP was doing anything but i don't know how to read the logs all that well so if someone could tell me if they think the MAP is functioning that would be great!

LOG: 34634

Any ideas would be very helpful.

Thanks!
Jamie

[Crasher]

Your boost pressure is stuck on 2193mBar which suggests a failed MAP/IAT (AKA "Thrust" sensor) and I have seen these stick.

[jmejamie]

Hi Guys,

I've changed the MAP unit on the car for her however we are still getting the same problem. The error code will not go away!

I put a multi-meter across the pins and got the following:
1 - Ground?
2 - approx 4.9V
3 - nothing
4 - approx 5-5.1V

Could anyone let me know if getting nothing on pin 3 is normal? Or maybe this is the part of the problem and the reason for the code?

Since changing the sensor i have done another scan for faults and got the following:

2 Faults Found:
18000 - Altitude Sensor / Boost Pressure Sensor
P1592 - 000 - Implausible Correlation
Freeze Frame:
RPM: 0 /min
Torque: 0.0 Nm
Speed: 0.0 km/h
Load: 0.0 %
Voltage: 12.39 V
Bin. Bits: 00000100
Absolute Pres.: 999.6 mbar
Absolute Pres.: 2182.8 mbar


16621 - Manifold Pressure / Boost Sensor (G31)
P0237 - 000 - Signal too Low
Freeze Frame:
RPM: 0 /min
Torque: 0.0 Nm
Speed: 0.0 km/h
Load: 0.0 %
Voltage: 12.39 V
Bin. Bits: 00000100
Absolute Pres.: 183.6 mbar
Absolute Pres.: 2182.8 mbar


Readiness: 0 0 1 1 1

Any help would be really appreciated! I also found out her engine code is: BKC

Thanks,
Jamie

[Tsamhc]

hi, i have the same problem on my audi a3 engine BCK 1.9 TDI. Did you find a solution? Reading online could be some electrical wire from the MAP sensor... I've already tried to change all the sensors

[Crasher]

There is a harness repair set available from VW under the part number 1KD 971 658