939005172 - Y043 P0403 - EGR VALVE (SC TO EARTH)

The diagnostic equipment signals: Error P0403 (EGR valve), with detail "short circuit to earth"
This error is detected if there is a short circuit to earth in the circuit connected to Pin 60 of the junction unit.As a result, the maximum power is reduced, the exhaust gas circulation valve is switched off and the supercharging pressure can longer be controlled.
1Preliminary checkALL OKPROBLEMS ENCOUNTEREDACTION
Check, in the junction unit under the dashboard, that fuse F35 has not blown (it is the second from the right in the top row)    See B002 JUNCTION UNIT UNDER DASHBOARD Move on to Step 2The fuse has blownContinue carrying out the    See Test 1064BE CHECK TURBO VALVE PROTECTION FUSE
2Air circuit checkALL OKPROBLEMS ENCOUNTEREDACTION
Check the seal of the inlet/supercharging system hoses.Check the hoses and pipes connected to identify any obstructions, damage etc.Check that the pipe restriction bands in the air intake/inlet system are correctly fitted.Move on to Step 3Connections faulty, obstructions or porousnessRenew or, if necessary, replace the faulty components
3EGR valve operation checkALL OKPROBLEMS ENCOUNTEREDACTION
Check that the EGR valve is working properly by carrying out the    See Test 1080CB E.G.R. SOLENOID FUNCTIONAL TESTEnd of diagnosis