939005169 - Y040 P0402 - EGR VALVE

The diagnostic equipment signals: Error P0402 (EGR valve).
This error is detected if the quantity of exhaust gas recirculation is too high.As a result, the exhaust gas recirculation valve is switched off and the supercharging pressure can longer be controlled and the quantity of fuel injected is reduced.
0Preliminary checksALL 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 1Connections faulty, obstructions or porousnessRenew or, if necessary, replace the faulty components
1Check using diagnostic equipmentALL OKPROBLEMS ENCOUNTEREDACTION
Select the following system on the diagnostic equipment: Diesel EDC16C39 electronic injection system and check the following parameters:

  • Air temperature in the intake manifold
    See Test 1064BD SUPERCHARGING TEMPERATURE CHECK

  • Supercharging pressure Objective

  • Supercharging pressure Measured
    See Test 1060GF SUPERCHARGING PRESSURE CHECK

  • Measured air mass
    See Test 1060GG MEASURED AIR MASS CHECK
End of diagnosis