Y040 P0402 - EGR VALVE - Alfa - 159 - eLearn

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.

0	Preliminary checks	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	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 1	Connections faulty, obstructions or porousness	Renew or, if necessary, replace the faulty components
1	Check using diagnostic equipment	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	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

Preliminary checks

ALL OK

PROBLEMS ENCOUNTERED

ACTION

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 1

Connections faulty, obstructions or porousness

Renew or, if necessary, replace the faulty components

Check using diagnostic equipment

ALL OK

PROBLEMS ENCOUNTERED

ACTION

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