Engine - MIL ON/Loss Of Performance/Multiple DTC's Set
01 MIL on, loss of performance
01 13 80
2024344/2
March 25, 2013.
Supersedes Technical DIAGNOSIS AND REPAIR Group 01 number 11-19 dated February 3, 2011 for reasons listed below.
Vehicle Information
Condition
^ MIL on.
^ Vehicle has reduced performance (in "limp mode").
^ Various entries may be logged:
^ DTC P0234 (Boost pressure control, limit exceeded)
^ DTC P0235 (Boost pressure control, below limit)
^ DTC P0299 (Boost pressure control, below limit)
^ DTC P1000 (Turbo charger adjustment stiff or seized)
Technical Background
After recognizing that the boost pressure is too low or too high, the engine control module switches to emergency operation and the engine
performance is reduced via the injected fuel quantity ("limp mode").
Variances in boost pressure can be caused by:
^ Dirty or clogged air intake.
^ Leak in charge air pipes (boost air hoses, intercooler) caused by physical damage or a loose connection.
^ Exhaust manifold or compensator pipe (the pipe between turbo charger and exhaust manifold) is damaged. The inner pipe of these components
348
may be broken, allowing particles to get to the turbine adjustment.
Production Solution
Not applicable.
Service
1. Try to reproduce the customer complaint so that it can be clearly assigned to this bulletin.
2. Check air filter and snow mesh for dirt.
3. Perform pressure test on boost air system. If a boost leak is found, repair the leak and proceed to Step 4. Otherwise, proceed to Step 5.
4. Using the test tool, select GFF >> 01 - Engine Electronics, functions >> 01 - Diesel Particle Filter, emergency regeneration (RG.26). Select the
option for a stationary regeneration and follow the steps given by the test tool to burn off excess soot trapped by the filter due to the boost leak.
Tip:
A leak will increase the amount of soot produced. This can cause the diesel particle filter to be filled much quicker than normal.
5. Perform visual check for leaks on connections and damage through animal bites.
6. Check the turbine adjustment of the turbo charger via final control diagnosis.
7. The rods for the turbine adjustment must move freely; otherwise, perform a visual check of the turbo charger or remove it for a check. If the
adjustment is stiff, remove and carefully check the exhaust manifold (cylinder bank 1 and 2) with the compensator pipe.
Tip:
If rust particles or metal parts enter the turbine fan of the turbo charger, the adjustment mechanism of the turbine blades becomes damaged and
material on the turbine dislodges.
8. If the exhaust manifolds or compensator pipes are damaged, replace them.
9. To avoid repeat damage, replace the turbo charger, exhaust manifolds, and compensator pipes.
Tip:
With repeat damage on the turbo charger, it is possible that foreign bodies entered the turbine of the turbo charger.
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service
