Audi A8L EPC and Check Engine Light On:P2070 & P1054

A Audi A8L made 2014 with 70 thousands kilometers,equiped with 2.5 CVBA engine.The owner discribed that EPC light on,shake intermittently when accelerating,accelerate slowly, and hard to start.

 

Trouble Diagnose:

Technician found two trouble code by VAS6150.

P1054:Secondary Air Injection Pipe Malfunction

P2070:Intake Manifold Tuning Value Stuck Open Bank

 

Firstly,check the trouble code P2070:Intake Manifold Tuning Value Stuck Open Bank

• Check the intake air control valve,it is normal.
• Vacuum solenoid valve work correctly.
• Auto water pump was damaged.

 

Technician found variable intake flaps work correctly after replacing a new water pump,and P2070 trouble cleanning.

 

Next,technician checked the trouble code P1054,below show the circuit diagram.

Technician detected the voltage between cam control valve connector 1 and GND,it is 0 V(error),but the voltage between N319 connector and GND is 12.Check the diagram,it shows that N208 and N319 are supplied by the same one power.It mean there is a open circuit.

 

How to Solve?

P2070:Replacing a new water pump.

P1054:Fix the wire