(1) connect the diode pen to the te

(1) connect the diode pen to the terminal "1" (positive pole) and "2" of the solenoid valve connector of the activated carbon tank;Carry out the diagnosis of the executive component, choose "activated carbon canister solenoid valve -N80";(3) diode pen should be bright;(4) if the diode pen does not shine or is always on, connect the test box v.a.g1598/31 to the harness of the engine control unit (not connected to the engine control unit);If the diode pen is always on, check whether the connection between the solenoid valve -N80 connector terminal "2" and the conductor "64" of the detection box v.a.g1598/31 is short to the ground;6. If the diode pencil is not shiny, should check the charcoal canister solenoid valve - N80 splicing device terminal "2" and test kits V.A.G 1598/31 terminal "64" whether the wire connection to the positive short circuit or open circuit (1.5 Ω conductor resistance maximum), should be excluded if necessary grounding or wire circuit fault;If the wire connection is neither short circuit nor broken fault, the engine control unit should be replaced.