Categories: Auto Repair

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.