LI07.09-N-063338 allegedly has details related to this issue.
You are correct sir, unfortunately it is not quite up to date as it was last updated in 2017 but here is the meat and potatoes of the document:
Complaint
Check engine light with some or all the following DTCs relating to the cooling / vacuum systems.
- P003313 - "The output for the switchover valve of bypass flap 'Charge air' has an electrical fault. There is an open circuit."
- P0299FA - "The boost pressure of turbocharger 1 is too low."
- P0299FB - "The boost pressure of turbocharger 1 is too low."
- P226100 - "The bypass flap 'Charge air' has a mechanical malfunction."
- P261F71 - "The output for the recirculation pump 'coolant' has a malfunction or does not switch on. The actuator is blocked."
- P012800 - "The coolant temperature is below the coolant thermostat specified temperature."
- P012809 - "The coolant temperature is below the coolant thermostat specified temperature. There is a component fault."
Cause
The above codes may be created by the following:
1- Vacuum Leak
2- Damaged O-Ring
3- Contamination: Coolant or Oil
4- Damaged water pump impeller
Remedy
1- Inspect the vacuum system for loose connections or cracked hoses
2- Smoke test or pressurize the system to detect a leak especially in the following known areas
-Water pump mounting plate
-Vacuum connection on water pump mounting plate
-Water pump O-ring
-Water pump vacuum line
-Water pump
-Vacuum manifold / Vacuum reservoir
Note: ONLY USE LOW PRESSURE MAXIMUM 1BAR / 14.7psi TO AVOID DAMAGES
3- Remove vacuum hoses from vacuum reservoir and look for the following
- Particulate matter
- Contamination of the inside of the vacuum connection
- Any signs of coolant and / or oil on the inside of vacuum connections on the vacuum reservoir
4 - Perform all Diagnostic procedure before replacing any parts.
5 - If coolant is found in the vacuum system replace the water pump, vacuum reservoir, change-over valve and clean the vacuum lines.
6 - If oil contamination is found in the vacuum system replace the vacuum pump, vacuum reservoir, Dashpot (Additional brake vacuum tank on 3500 models), brake booster and clean the vacuum lines.
7 - Remove and inspect water pump impeller for damage, replace as needed.