Fuel Trim/MAF Problem
I own a 2.0l FSi 53 plate A3 engine code AXW. Recently the MIL turned on just after leaving the motorway idling after a 45 minute blast from Manchester.
Over Xmas is had EGR problems and invested in VAG.COM and it has paid for its self already. The two fault codes are as followed:
17560 - Long Term Fuel Trim Additive Air; Bank 1; Range 2: System too Lean
16825 - EVAP Emission Control Sys: Incorrect Flow
17560 Fault Code
Ross Tech
Possible Solutions
Check Mass Air Flow Sensors (G70)
Check Intake Air System for Leaks - CHECKED
Check Fuel Injector(s) - CLEANED
Check Fuel Pump
Check Exhaust System for Leaks - CHECKED
Check Secondary Air Injection System - UNSURE??
I have done some research into Fuel Trim
http://wiki.ross-tech.com/index.php/Fuel_Trim_Info
From this I understand to measure Group 032 and the first 2 values will be percentages, according to the Ross-Tech help the values should be within +/- 10%:
6.2% - PASS under 10%
16.7% - FAIL over 10%
16.7% is failing at elevated engine speeds (Multiplicative) which confirms the fault code.
In general, an out-of-spec value in the first field (Additive) indicates a vacuum leak since it is mostly present at idle, when vacuum is highest. An out-of-spec value in the second field (Multiplicative) indicates a fault at higher RPM, and may point to a faulty MAF.
From reading this I gave Audi Preston a call to quote for a replacement MAF, if it was less that £50 I was going to change w/o investigation. After speaking to the parts guy he returned with theres no MAF on the system. After looking on ElsaWIN Ive found a Intake Manifold Pressure Sender -G71- with Intake Air Temperature Sender -G42- am I correct in believing this is the MAF?
16825 Fault Code
After searching for leaks in the vacuum system for the previous fault code there was a release in pressure which appeared to be in the pipe running from the Carbon Canister to the intake manifold, this is what I believe has caused this fault code and there for im happy to ignore this.
Questions??
Many thanks for anyone who can shine some light..
Cheers,
Ben
I own a 2.0l FSi 53 plate A3 engine code AXW. Recently the MIL turned on just after leaving the motorway idling after a 45 minute blast from Manchester.
Over Xmas is had EGR problems and invested in VAG.COM and it has paid for its self already. The two fault codes are as followed:
17560 - Long Term Fuel Trim Additive Air; Bank 1; Range 2: System too Lean
16825 - EVAP Emission Control Sys: Incorrect Flow
17560 Fault Code
Ross Tech
Possible Solutions
Check Mass Air Flow Sensors (G70)
Check Intake Air System for Leaks - CHECKED
Check Fuel Injector(s) - CLEANED
Check Fuel Pump
Check Exhaust System for Leaks - CHECKED
Check Secondary Air Injection System - UNSURE??
I have done some research into Fuel Trim
http://wiki.ross-tech.com/index.php/Fuel_Trim_Info
From this I understand to measure Group 032 and the first 2 values will be percentages, according to the Ross-Tech help the values should be within +/- 10%:
6.2% - PASS under 10%
16.7% - FAIL over 10%
16.7% is failing at elevated engine speeds (Multiplicative) which confirms the fault code.
In general, an out-of-spec value in the first field (Additive) indicates a vacuum leak since it is mostly present at idle, when vacuum is highest. An out-of-spec value in the second field (Multiplicative) indicates a fault at higher RPM, and may point to a faulty MAF.
From reading this I gave Audi Preston a call to quote for a replacement MAF, if it was less that £50 I was going to change w/o investigation. After speaking to the parts guy he returned with theres no MAF on the system. After looking on ElsaWIN Ive found a Intake Manifold Pressure Sender -G71- with Intake Air Temperature Sender -G42- am I correct in believing this is the MAF?
16825 Fault Code
After searching for leaks in the vacuum system for the previous fault code there was a release in pressure which appeared to be in the pipe running from the Carbon Canister to the intake manifold, this is what I believe has caused this fault code and there for im happy to ignore this.
Questions??
- Is the Intake Manifold Pressure Sender -G71- with Intake Air Temperature Sender -G42- the MAF on my car
- The term Bank 1; Range 2 what does this mean?
Many thanks for anyone who can shine some light..
Cheers,
Ben
